Hello again everyone. So I got the new transmission installed and overdrive refuses to engage despite having a new OD solenoid installed. Also, from a dead stop under WOT acceleration, 1-2 shift occurs at 3800 rpm and 2-3 shift occurs at 4400 rpm dead on the nose every time, both cold start and at operating temps. Transmission has a heavy-duty ultra capacity cooler installed and is keeping things nice and cool. Is there something seriously wrong with my replacement trans or could this be pcm related? Could it be that whoever rebuilt it f'd up the valve body assembly somehow? I'm getting really close to removing this thing and purchasing a 3rd, this time new, transmission from a shop here in town... I cannot have my truck off the road any longer. Can anyone point me in the right direction? Any help would be greatly appreciated. Please advise.

 

What type of transmission is it, lock out etc etc also are you sure the torque converter is fully seated against the flywheel, if it's not correctly seated it will throw off your shift positions. have you tried to replace the speed sensor ? need more details about what type of tranny u have.

 

Make sure the TV cable is adjusted properly.

 

Sorry for the lack of info. Truck is a 2000 1500 with 5.2 engine. I got the replacement tranny off a guy with a 1998 1500 with a 5.9 engine. On the previous trans overdrive worked but the OD switch would not disengage it. On the new trans it simply will not engage. Converter/flywheel are flush, extra care was taken to re-assemble this baby. I purposefully adjusted the TV cable erratically to see if shift points would change, and they did, but only at low rpm's and 'harshness' of the shifting was affected. But under wide open throttle the truck still shifts at the RPMs referenced in my first post, which leads me to believe this might be something electrical. If I manually shift through the gears I redline with awesome acceleration and power all the way through 3rd gear. I never knew just how bad my old trans was on it's way out until I felt this thing pull. Just wish I could get OD to engage then I'd be set. I don't even care if I can't get the OD button to disengage like it's supposed to... I just want use of all my gears!


Now someone told me that if the OD switch is bad, this might prevent OD from engaging. I find this hard to believe due to the fact that OD worked fine on my old trans but the switch did not. Is there any truth to this? Also... I looked up some troubleshooting for this problem and a 'OD switch fuse' is referenced as possibly being blown, but nowhere is a location given for this fuse. I have checked all fuses under the hood and in the passenger compartment that I could find and they are all operative.

Also, I have not tried replacing the speed sensor. I am not having trouble with the odometer or speedometer so I assume the sensor is fine. Could it still failing regardless of normal speedo operation?

 

The 2000 trans has a different Pressure/Temp sensor in the valvebody. Assuming you still have your '98 transmission, remove the old valvebody, remove the old transmission harness along with the Gov Pressure solenoid, Temp/Pressure sensor block, TCC and OD solenoids, and swap into the 2000 trans in the truck.

The 96-99 and the '00 up sensors read differently, which does indeed cause PCM problems, one of them being improper OD function.

Swap the old stuff into your new trans and you might just solve your problems.

 

OOPS! I got it backwards,
Swap your '00 truck's original electrical internals into the '98 trans.