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So brake switch is working properly and still no torque converter lock up. Now I am leaning to the conclusion that the torque converter itself maybe cracked or damaged.

I am also having a TCC problem. I have replaced the TCC solenoid when I change the fluid, swapped the speed sensors, and still no lock up. I had the brake switch disconnected as I was driving at 55 turning 3000rpm’s and engaged the brake switch and no change. I am thinking of replacing the...

Thank you sir.

Sorry about that, yes, Jupiter Florida. I just added it.

i will look for one. Is their a way to test if the torque converter is locking up?

Something is definitely not right with this transmission then. 4th gear is 3000 rpm at 55.

It’s definitely shifting 1-2,2-3,3-4. What type of RPM should it be at with a 4.08 differential and 4l80e?

So why would it be only going 55mph turning 3000 rpm’s. My guess was the 3.08 differential?

So I guess all M1165A1 don’t come with 4L80e here is a picture of the Tran.

It is going into 4th gear. At 55 mph it is turning 3000 rpm’s.

So I have a M1165A1 with a 3.08 Diff. When I was buying it I thought I was going to be able to drive over 55 mph but I was wrong. Does anyone know if it would be possible to buy 2 sets of ring and pinions and have them installed? I think that would get me to 70 MPH. the truck is not going to...

I bought it from Erik's Military and Industrial Surplus. Any suggestions on where to buy one?

Do you have any idea why the fan would come on at 185? I have put two different Temperature switches and a new Time delay module. The fan is off on a cold start and as soon as it hits 185 it comes on and stays on. I have also checked it with an IR thermometer and it is truly at 185.

Where did you end up getting it?

Did your AC work out using the bracket?