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Borrow an old TEch-1 or Tech-1A scan tool from a local dealer or shop. GM Dealer. When you select a vehicle start with a 1995 or 1996 P-Truck DIESEL. This will get you to the TCM selection allowing you to view all you need. Or if you have a Laptop, MOATES.NET ALDL tool or cable I can send...

You said you verified the RPM with a TACH??? You should VERIFY the ENGINE RPM IS CORRECT WITH A SCAN TOOL. THERE IS NO OTHER WAY. The TCM uses the signal for TCC, diags and other items. I have seen where others (and aftermarket TCM's) use a toggle Switch to "GROUND" the TCC Solenoid to...

Will L. As the Gentleman asked below did you take into account the Engine Spd Sensor is actual from the camshaft sensor? It has 2 pulses per rev and the TCM is calibrated to run this way. If the pulse is incorrect you can set TCC Codes and maybe in 3rd Gr at Highway spds. You should invest...

Hello Will L. I assume your H1 is a 1995 6.5L Diesel with a 4L80-E. Is your System a Mechanical Injector Pump not PCM controlled WITH a TCM controlling the 4L80-E? Or is it a PCM Controlled Pump and trans? Did you ADD the turbo without any mods to the Trans and Trans controls. I need to know...

Hello, I didn't know if this place so THANK YOU for sending this to me. I always just used Transtar or another supplier. Keep in mind about the Ignition Switch going Open on some pins and this caused Trans electrical codes. I would tell your husband if y'all wanna keep this truck, I'd...

If you elect to use the 1/8 inch pipe plug for your Trans Temp Sensor, just keep in mind the Port is actually used for testing the trans PRESSURE and can exceed over 250 psi. I would suggest using the Pan and have a pipe thread female nut TIG welded into it for the Temp Sensor. (If you are in...

Azbella, I take "pulling the codes" means you are requesting the PCM/TCM for diag code to blink out or through a scan tool. With this in mind, and you still are having the TFT (Trans Fluid Temp) code, I would suggest you make sure the connector is "CLOCKED" correctly and fully plugged in all...

Hello Azbella, I am afraid you have MISLEAD. The Trans Temp Sensor is NOT a part of the Pressure Switch Manifold Switch Assembly. The Actual sensor is part of the INTERNAL Transmission wiring harness. It has a small two pin connector and is zipped tied to the harness. (The 4L60/65/70-E had...

6.5L Running HOT? Hello, If you would like my 2 cents worth about your Diesel heating UP, I can tell you from what I know. I was a trans calibrator for 4L80-E and interfaced with the 6.5L Boys for a number of years and on a few trips. FYI.. Towing a load 180 stats will only delay the...

It all is dependant on your temp sensor. When I need to verify the TCM trans temp I use a K-Type Thermocouple wire twisted and use the dipstick tube and connect it to a Fluke 52 meter. It WILL read a bit different for a short period of time WHILE Driving. This is due to the return oil into the...

Hello, I was the diagnostic person for 4L80-E Trans at the Proving Grounds. The 1st item I would do is: (After insuring the DTC's from the TCM) Replace the internal wiring harness and correctly splice in the external mating harness. (The pass-through connector had a host of connection problem...

The 4L80-E trans will have a RPO code of "MT1". The "Main" Trans electrical connector is located on the drivers side. 4L60-E Main electrical connector is located on the pass side of the case.

Hello jrsavi\oie. Did you get a jig yet? If not a small black or even a spare trans case will do ver well. I would suggest to TIG both sides of the case. I also would find why it broke. I would insure the lower trans cover bars are in place and torqued right. When you install all the...

Hello, I am a GM retiree. I have some knowledge of GM powertrains. I have a 1977 Black Crew Cab Dually. It had originally a 7.4L THM 400 and 4.10 axle. Now the truck has a 468 cu in oval ported head, flat top pistons, reman engine with a cam of higher lift/dur. I have the first released...