Search results

No upshift cold 400 I assume you have tried to change or inspect the filter seal in the pump neck and are ok not hard and brittle. This was a common problem with 400's back in the 70's and 80's. If the electrical disconnect didn't help, it usually is the clutch seals are getting aged and...

(1) I have heard lots of conflicting stories about how to tow a trailer or haul loads with the 4L80E. Some say just leave it in OD. Some say run it in DD. Some say Run OD till you hit a hill then down shift to DD then shift back up to OD. Now i'm sure i'll hear a bunch more of these 3 claims...

I see you are from Michigan. Try the Transmission Clinic in Madison Heights on John R . They are in the fone book. I know the owner. His work is honest and fair. I have recommended him to many and all of them had a good job for fair price.

Personally, I would at least put clutches, all the seals, and gaskets in it. Buy a Dayco reman converter. Add a qt or so of oil. You didn't say what year your truck was OR the trans was. In 4L80-E The 1991-1993 need to stay with the TCM/PCM. The FM is a Bosch and has a cleaning cycle to...

Your TCC "ON" in second, thrid, & forth can be a pressure switch grounding the electrical path. Another common failure is the TCC Valve in the PUMP, under the TCC Solenoid stuck in the applied position. The solenoid failed is less likely but still possible. I would do this: Get the trans...

responses are in Italics. YOU SAY: The force motor AKA PCS that controls the line pressure changed from 93 to 94. It went from a 292.5HZ(cycles per second) to a 614HZ(cycles per second) and eliminated the cleaning cycle every 10 seconds that was used on the previous 91-93 force motor. 91-93...

This information is only PARTICALLY CORRECT. There is no such "different valve body due to a different LOCK UP FREQUENCY". What is this LOCK UP FREQUENCY? Elimination of the PWM cleaning cycle? Do you mean the TCC PWM cleaning cycle that is NOT REAL? What is the 91-93 PROM can't be...

I will try to help but I need specific info. Did many @ GM in buy-back. First. I take it you bought it this way? Have you looked at the engine and trans mounts for collapsing and ground outs? Exhaust ground out on the frame? Broken Flywheel and/or trans case I need these cleared 1st...

WarWagon, I worked in Olds dealers and worked on a few of these engines in Caddys. The System is slow but ran well for the time. The Choke Heater would fail yearly and the vacuum hose to the ECM would rot away. Easy fix. The choke heater caused high idles and is located in the throttle body...

I see you are thinking! A bit larger on the outlet so the air can flow out. One item I have NOT seen talked about is the gas or especially the diesel air inlet on the body style you have. The truck NEEDS a few important changes. A bit larger radiator. Larger frontal area with an air dam...

schiker, no pic will do it right. The inner wells are opened up at the upper control arm. This allow the air that was scooped up to flow out. I had discussions with some truck cooling people about the 95 body with the diesel & Big Block that runs hot. Tried to eliminate this. Also asked...

I will try this again........ I typed a big reply but it didn't take I doubt you will measure a cracked solder joint. You might see it if you can stress the board to open up some to show this. I never really looked. You stated your ECM and I take it this is really your TCM you discuss...

I will try this again........ I typed a big reply but it didn't take I doubt you will measure a cracked solder joint. You might see it if you can stress the board to open up some to show this. I never really looked. You stated your ECM and I take it this is really your TCM you discuss. So...

Jakes Performance is $590 IF you buy his trans. Not a very good TCM in my opinion. It may shift hard but high line pressure at IDLE WILL DRAG THE CONVERTER CLUTCH and inside the transmission, life (after 10to 30k miles or so) will need a converter and the shops will scare you into an overhaul...

Well I hope it will help you. I really don't think this person was or is a Service DIRECTOR. They were to far removed to even know what a Loose solder Joint is. He was probably closer to a workin man as I was. Anyway. I am assuming your truck IS a 1992 or 1993. The Tech-2 Might NOT read...

I re-read this and had to make some comments. Take the TCM out so you can drive around with it exposed. But before this, wire in or Back Probe the TCM harness @ the TCM for two connections (With two test lights. You want to see if the voltage is dropping out). 1 for Switched Ignition and 2...

The TCM Eng Spd will function with a ISS/OSS for Engine RPM input to the right pin on the TCM. You may have to change the calibration to correct for the engine speed. (Yes you can make up a wheel or sloted wheel and place an ISS or an OSS close and it will serve as your ENgine Spd sensor. Two...

BURNING OIL, The TCM can understand either a sign or square wave. The Square wave that works well is an old Ignition module. I used the TCM at first with a carb on my 77 crew cab. I tapped off the Pick up coil (It ran the HEI and my extra HEI MODULE). The EXTRA module was from a aprox 1990...

Will, The Tech-1 WILL communicate with your TRUCK. It has to have a 12 PIN ALDL under the dash. (That is where we @ GM Proving GRounds always found them with the H1 military and commercial hummers. By the steering column. If I remember right I saw a few inside the water tight TCM box...

You can contact "V" for info. The Tech-1 or T-1A is NO longer serviced or sold. No cartridges either. Maybe e-bay. TECH-@ DOES AND WILL COMMUNICATE WITH YOUR OLD HUMMER. Only 1994 forward H-1's though. They ARE the SAME TCM. It was used in Mechanical Pump H1 for a long time and were used...