I think Holley missed the boat on this one. I have read a lot of posts where people are having same issue, and sifted through the junk to find that setting up a T56 2-wire speed sensor to output correct speed and further to output speed to a speedometer is no small task. It seems like this is a frequently asked question and it's surrounded by a lot of mystery. One would think that this should be easy & straightforward, It's not! So far I can at least get the display on my tablet to show some speed when driving. When I'm doing 40 mph, it says about 10 mph, I've changed the PPM from 2 to 9999 in the Transmission ICF and it does not change the speed. How I got this far was by wiring both wires from the VSS to connector J4 (the transmission connector if you have an automatic) after creating a Transmission ICF & enabling speedometer output, per Danny Cabral. When I first tried to setup the speedometer, I tried to add a VSS input, selected IPU/Freq assigned it a pin and then grounded the other side, that seemed logical and obviously so have a lot of other people on here that didn't work. I like figuring things out as much as the next guy, but this is over-complicated. Please someone help me out here, show me the light. If I ask how to make toast please don't give me a rundown on how the toaster works, or how it was invented, or what type of bread tastes the best. Just simple instructions plug in toaster, place bread in slots set dial to desired color, push button, wait for toast. Example, once I have the Transmission IPU created and speedometer output enabled the J4 plug looks for VSS signal on 1 wire and ground on another. I have both of the wires going directly from the VSS to the J4 at their correct pin locations. Now I'm able to see a speed on the Holley gauges display on my tablet. It is the wrong speed though. Am I to understand that I would need to then piggyback a wire off of the VSS wire going into the J4 and create a separate "VSS Input" like I did in the first place assign it a freq pin-out and use that as my speedometer output?, or use the speedometer output that was created when I added the Transmission ICF? Either way because I have now created this VSS Input can I now go in and modify pulse to average or pulse per rotation to correct the Holley display on my tablet so it reads the correct speed? Sorry if I sound like a jerk with the toaster comparison, but I have devoted way too much time trying to get a speedometer to work, and just want to be done with this. Next step, I will remove my speedometer and place it in a vice, use a 4ft pipe on the vice to crush the life out of it then get a GPS speedometer. I'm at the end of my rope.
Further, if you have a Tremec T56 Magnum gearbox it comes with two speed sensor locations (mechanical and electronic).
I have chosen to go with the electronic version as you can easily buy a blanking plate for the mechanical sensor and an installation kit that has the other sensors in it.
NOTE: there are different electronic speed sensors (VSS sensor) depending on the T56 version you will have bought. I fell foul of this and had to re-order the correct sensor.
I ended purchasing the parts from differing places but I've since found that bowler transmissions in the USA do all the parts needed:
Finally you will need a 1/4"UNC x 1/2" bolt to secure the blanking plate to the transmission, which I got from Kays on ebay.
First fit the blanking plate, which is on the left hand side of the gearbox (if your looking down from above with the engine in front of you).
Next install the reverse lockout pigtail which goes on the sensor to the rear of the gearbox near the shifter.
There is only about 6 inches of wire on each of the pigtails so I extended them using the same colour wires purchased of ebay. There was enough wire added to get them behind the dash when the body is fitted, hopefully making the future wiring job easier. Just for good measure I labelled each set of wires with some cheap labels bought from ebay.
The crimp connectors I bought don't seem to work well so I bought a cheap soldering kit instead and soldered them together.
This might seem like a daunting task but you can learn to do anything on youtube these days and I found its actually quite easy to do.
In order to activate the solenoid and allow reverse to be selected I also purchased the following product from Accutech. Basically, its designed for the T56 and will activate the solenoid when the car drops below 5mph. People might advise you that you can force the gearbox into reverse without this but it is not recommended by Tremec and is designed to allow access to reverse in an emergency, not for day to day use.
Next up was the electronic speed sensor which is located on the right hand side of the gearbox below the shifter.
All of the wiring has been placed inside 10mm loom conduit to ensure they are protected from damage. 5mm Rivnuts were added to the tunnel frame so that rubber lined P-clips could be used to secure the conduit.
Finally, connect the reverse light pigtail, which, perhaps surprisingly makes the reverse lights come on when reverse gear is selected. This sensor already has a small amount of wire attached so I used one of the mounting "ears" on the gearbox to secure the wire with a p-clip and 6mm bolt.
As stated earlier in the post, all the wires have been extended forward to allow easy routing behind the dash when the body goes on. I am almost at the point where the chassis is ready to accept the body. There is just a small job to secure part of the fuel line which I'll hopefully get to next week.
The picture below shows the extended wires and conduit.
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Close cart. Quick view. Has GM VSS connector The All-in-One harness solution for the Tremec T Magnum transmission comes equipped with all the connections pre-wired into one harness for a simple installation and ease of use. The small epoxy sealed controller is mounted to the VSS output using the existing bolt, and once the unit is powered up you will be able to connect via Bluetooth to your Apple or Android smartphone using our free app. The app will give you the ability to customize the input and output settings for each feature to ensure proper operation in your vehicle.
The All-in-One harness eliminates the need for any additional equipment to operate the reverse lock out or generate the correct speedometer signals coming from your Tremec T Magnum.
This All-in-One harness solution is the perfect finishing touch for any Tremec T Magnum conversion, and the only harness you will ever need. Prior to the development of the All-in-One harness you would need up to 5 separate parts to perform all the same functions wrapped up in this one harness solution. Getting the correct speed sensor output and operating the reverse lock out are typically the most frustrating and confusing. The more technology we incorporate into our hot rods these days sometimes requires specific input signals to allow everything to function correctly.
There may be scenarios where you are using a speedometer that requires one signal and an ECM that requires a completely different signal. With the 2 speed outputs that are available in the All-in-One harness you can independently control the output of each one further eliminating any need for additional equipment and connections.
The reverse lock out on the Tremec T Magnum is another commonly misunderstood feature. The reverse lock out is a solenoid controlled pin, that uses a spring to exert pressure against the shift rail, to help prevent an accidental shift into reverse when going into 5th gear. It doesn't prohibit reverse engagement, it only makes it difficult to shift into reverse when it is not getting a power signal.
Once power is applied, the solenoid pulls the pin back allowing reverse engagement with minimal effort. We've incorporated that same speed setting feature into the All-in-One harness to give you better control over when the lock out is triggered.
Control of the reverse lockout solenoid is based on a user defined speed setting Default is set at locked above 4 MPH and unlocked at MPH This eliminates the need for a separate lock out control box which is currently the only option to activate the reverse lock out correctly. This method will get the job done, but can over work the solenoid, and over time shorten its life span. But, you say, my ECM input needs a positive only signal. No problem! The 2 speed sensor outputs are completely independent and can be calibrated separately with any pulse count and ratio you want.
So, these two outputs should pretty much be able to drive any common speedometer, cruise control, or ECM. This will give you much greater flexibility in the components you are able to use and requires less time wiring everything up.To his artistic daughter poem
The reverse lights are powered by a single output wire connected to the positive side of your reverse lights; grounding of those lights should be local to the bulb socket. There is no easier solution for setting up your Tremec T Magnum transmission!Write text html canvas
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Loading Tomorrow Estimated International Date Check Fit. Brand: Dakota Digital. Part Type: Gauge Wiring Harnesses.
Speedometer Sender Style: Electronic. Quantity: Sold individually. Notes: Fits most T56 transmissions with stock GM speed sensor.
Dakota Digital vehicle speed sensor connectors are available for a variety of applications. They connect your speed sensor to your transmission. I have a Customer Service question order, shipping, returns, etc. I would like to ask other customers a question about this Product. Answer This Question. Summit Racing Verified Purchase.
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Date: March 25, Date: July 19, Discussion in ' Electrical Systems ' started by sexypizzamanDec 17, Dec 17, 1. Messages: 16 Likes Received: 0. Dec 17, 2. Messages: 17, Likes Received: Neutral safety, leave it like stock. It runs through the pedal switch and has nothing to do with the transmission. The reverse lights are wired into the switch in the column. Just cut the wires, run longer wires to the reverse light signal on the transmission.
Dec 17, 3. Messages: 1, Likes Received: You originally had an auto trans so the factory clutch neutral switch is not on your car. If you want it, you will have to make your own or find a factory manual trans switch and retrofit it to your car. Most people do not use a neutral safety on their car when it is a manual trans. Zap strap, well you can use a plastic zip tie or some wire to hold the lever up. If it were to fall down you will not get the key out of the ignition. Like bad ass said just extend the wires on the existing reverse light switch and connect them to the switch on the trans.
The reverse switch on a t56 is on the right side. Dec 19, 4.
Dakota Digital with T-56
Messages: Likes Received: The factory NSS is easy to find. My car was Dec 19, 5. Messages: 1, Likes Received: 3. I just went through this not to long ago with my AAW kit I bypassed the safety switch by connecting the wires together. For the reverse I did whst was mentioned. I got the connector from the switch on the T56 and ran inside the vehicle and extended the wires from the AAW wiring and hooked them up.
Dec 19, 6. Messages: 19, Likes Received: Nss is easy, it hangs right on the clutch pedal. Light switch is right on the trans. You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet.
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I was wondering if maybe it needs a tune to get a reading or if the sensor is bad? I attached a pic of the sensor that is in my transmission its not a pic of my car, just one I got on the internet. Aug 14, 5, Houston Texas.
Are the electrical connectors the same? Ford uses VSS sensors up till The sensors are NOT compatible with each other. InFord changed the number of teeth on the reluctor wheel. So a 04 transmission into an earlier car will need as tune. The reverse is true as well.Want to row your own gears, make gobs of power, and even get decent gas mileage on the highway? The T56 is the ticket.
This six-speed wonder was designed and built by Borg-Warner originally, though manufacturing switched over to Tremec in It eventually replaced the ZF six-speed in the Corvette when the C5 was developed using a transaxle arrangement. Each of these had its own distinct nuances, including different gear ratios. And, of course, just when we started to get a handle on it, Tremec introduced the TR Thankfully, we are here to walk you through the differences, how they are put together, and even a few upgrades needed to breathe life into a worn-out unit.Automatic Transmission Vehicle Speed Sensor Location and Replacement
As you may know, the transmission in the C5 and C6 bolts directly to the rearend housing at the output. The input connects to the torque tube, which houses a prop shaft to connect to the clutch and flywheel. As such, the Corvette T56 has a different midplate, which is the plate that seals the front of the transmission. In a normal arrangement, this is where the bellhousing bolts to the trans.
Note that if you wish to convert an LT1 T56, you will also need to swap the midplate. At the rear, the tailhousing is obviously significantly different on a Corvette since it mates directly to the differential housing.
However, all others do not, which is typically where the shifter mounts more on that in a second. Converting a C5 or C6 T56 for use in a hot rod certainly has its advantages, which will also be covered later.
The longer external dimensions of the TR can sometimes be prohibitive to certain builds, but it boasts a number of advantages. The case is noticeably thicker than the T56, reinforced at all the critical areas, including at the flanges. The tailhousing is about 3 inches longer than your typical F-body or GTO and usually has a CV joint instead of a slip yoke.
Swapping the tailhousing is a common fix, though it requires some additional parts swapping. The midplate is another noticeable departure from the T56, which has provisions for an oil pump.
Shifter Location Each chassis has a unique shifter location. The Corvette obviously mounts the shifter on the torque tube, not the transmission, so it uses a very different shifter rail.
The F-body bolts directly to the transmission on the tailhousing. GTOs mount in a similar location, though, offset and pushed back. The shifter handle is actually behind the transmission, which means shifts are "indirect.
For the best shifter feel, mounting the shifter directly to the transmission like an F-body is preferred. That places the shifter handle 29 inches from the edge of the F-body bellhousing or 24 inches from the midplate.
Dakota Digital Vehicle Speed Sensor Connectors SEN-01-T56
Tremec's aftermarket upgrade for the T56, the Magnum essentially a TRis about 1. And with any T56, you also have the ability to use the forward shifter location, which is about Great for trucks and some oddball swaps! Fifth and Sixth are both overdrive gears that are mounted after, like a two-speed with a reverser.Login to Your Account.
Remember Me? Results 1 to 7 of 7. Thread: T56 has anyone ever got their speedometer to work?
Thread Tools Show Printable Version. T56 has anyone ever got their speedometer to work? I think Holley missed the boat on this one. I have read a lot of posts where people are having same issue, and sifted through the junk to find that setting up a T56 2-wire speed sensor to output correct speed and further to output speed to a speedometer is no small task. It seems like this is a frequently asked question and it's surrounded by a lot of mystery.
So far I can at least get the display on my tablet to show some speed when driving. I like figuring things out as much as the next guy, but this is over-complicated. Please someone help me out here, show me the light. If I ask how to make toast please don't give me a rundown on how the toaster works, or how it was invented, or what type of bread tastes the best.
Just simple instructions plug in toaster, place bread in slots set dial to desired color, push button, wait for toast. I have both of the wires going directly from the VSS to the J4 at their correct pin locations.
Now I'm able to see a speed on the Holley gauges display on my tablet. It is the wrong speed though. Am I to understand that I would need to then piggyback a wire off of the VSS wire going into the J4 and create a separate "VSS Input" like I did in the first place assign it a freq pin-out and use that as my speedometer output?
Either way because I have now created this VSS Input can I now go in and modify pulse to average or pulse per rotation to correct the Holley display on my tablet so it reads the correct speed? Sorry if I sound like a jerk with the toaster comparison, but I have devoted way too much time trying to get a speedometer to work, and just want to be done with this. Next step, I will remove my speedometer and place it in a vice, use a 4ft pipe on the vice to crush the life out of it then get a GPS speedometer.
I'm at the end of my rope. The T56 uses a 17 tooth wheel. Or if you use the Transmission ICF, you have to do some math. The Transmission ICF is looking for 40 pulses. So in the Speed Calculation section, you use your tire diameter measure across the tire or use math to determine tire size.Discussion in ' Electrical Systems ' started by stapleszooFeb 26, Feb 26, 1. Messages: Likes Received: 0.
Feb 26, 2. Messages: Likes Received: 2. I have dakota digital and a t56, I did not need a special box for reverse lockout or speedometer. I wired my reverse lockout to my brake switch and other have done it to a momentary push button. Speedometer works fine hooked up to the stock speed sender, all I had to do was calibrate it.
Feb 26, 3. So -- the reverse solenoid that prevents you from hitting reverse when you shift from 6th to 5th is wired to your brake switch?? I am trying not to have extra switches or odd buttons on the dash- trying for a clean install.
Feb 26, 4. Messages: 19, Likes Received: I had the brake switch and did not like it. Feb 26, 5. Believe me downshifting from 65mph the trans will let you know if you try going into reverse, it will grind and make all kind of noise.
If you manage to get it in reverse, you forced it anyway. Feb 26, 6. I ended up getting the Dakota speedometer signal interface as it looks like it should do the trick.Sergioragone
I just wish I knew about it earlier. Still waay back in the build process hoping to go for an engine start some time this spring.
Right now Im rewiring the car and running cables through the firewall.
Speed Sensor Pigtail T56
We decided to hold off on the digital ignition box for now-- as there are way too many gadgets to hook up. I have it already but just holding off installing it for now. I dont really think its necessary on a street car. Feb 26, 7. Thanks for moving this where it belonged-- i wasn't sure.
I was clear in what I was building and as I think about it if they bundled the signal interface and reverse lockout wiring harness they would better serve their customers.
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Sensor location speed t56
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