As has been mentioned, you are under geared for 33s. Also, given your recent issues, your transmission fluid might have deteriorated. Perhaps try changing it and see if the issue you describe still persists - and make sure you install a good cooler and also temp sensor at the right location (which is the pan) and monitor the trans temp if you plan to work the transmission hard with towing.
Transmission overheating
- Thread starter Marshall 55
- Start date
I'm not sure just a suggestion when i had a Silverado with a 4l80 trans if i kept it in third gear i could drive it. If i put it in drive it would overheat and send a code. I replaced the torque converter and flushed all the fluid and the trans worked for as long as i had the truck.
I haven't had a transmission open on a work table for a long time. Thanks for the memory.
That was my first and last.I haven't had a transmission open on a work table for a long time. Thanks for the memory.
My first was a Ford AOD. It lasted a spin around the block. After learning how to correctly put the clutch packs together with enough clutches and friction rings the second time it held and lasted me till I traded it in for my first diesel truck. In those days it hardly cost anything for the parts.
OP
Changed the PCM and it let me go 58 miles before the CEL threw same codes (0740,0700) looks like next is the valve body. Thanks for the info.
OP
*UPDATE*
I ordered a new PCM from Wrangler Fix and installed it. Jeep went 58 miles on interstate before throwing same 0740 and 0700 codes. I pulled over long enough to hook up OBD2 and clear codes then cranked back up and went another 30 miles home with no CEL coming on. I did the 160 amp Durango alternator upgrade with the big 7 from Jeep Cables and added a Interstate AGM battery a couple of moths ago. Could the extra amps/voltage have anything to do with it? Since I am having NO other shifting problems. Could it be the solenoids in the valve body malfunctioning? By me stopping, clearing the code and immediately driving off tells me that a solenoid could be opening/releasing when I stop. Am I wrong or is this possible? Transmission has not overheated since the 1st time the CEL came on and I drove around 20 miles before getting to an exit. Since that 1st time the CEL has come on I have stopped and cleared the code and pulled off like everything is normal.
I ordered a new PCM from Wrangler Fix and installed it. Jeep went 58 miles on interstate before throwing same 0740 and 0700 codes. I pulled over long enough to hook up OBD2 and clear codes then cranked back up and went another 30 miles home with no CEL coming on. I did the 160 amp Durango alternator upgrade with the big 7 from Jeep Cables and added a Interstate AGM battery a couple of moths ago. Could the extra amps/voltage have anything to do with it? Since I am having NO other shifting problems. Could it be the solenoids in the valve body malfunctioning? By me stopping, clearing the code and immediately driving off tells me that a solenoid could be opening/releasing when I stop. Am I wrong or is this possible? Transmission has not overheated since the 1st time the CEL came on and I drove around 20 miles before getting to an exit. Since that 1st time the CEL has come on I have stopped and cleared the code and pulled off like everything is normal.
The Durango alternator, AGM battery and new battery cables would have nothing to do with your problem. I already suggested it could be a solenoid/valve issue inside the valve body or something else to do with the valve body in post #20 above.
OP
Just making sure on the electrical upgrades. Looks like I will be replacing the valve body next and hope that will solve the issues. Thanks for the feedback.
OP
Or verifying the actual transmission temp, or verifying that the coolers are not being bypassed? Unless there is money to burn it is usually better to do some methodical troubleshooting instead of trial & error and swapping parts. A laser temp gun might help give a clue about temps and circulation. Just sayin.
A friend of mine who owned a transmission shop had a tool with multiple sensors that you could stick on different parts of the transmission and cooling system and a display inside the vehicle so he could see what was happening temp wise at any point in the system.
OP
Trans has not overheated since 1st time the CEL came on. I drove around 20 miles before stopping. Since then it came on 4 times on the way home. I would pull over clear the code and get right back on the road. I have been driving around town all week with NO issues. The only time I get a code is when I travel on the interstate over 50 miles. Do you think the trans temp will cool off enough in a matter of minutes? Can anyone agree that it is most likely a solenoid not working as it should?
OP
It sounds like you damaged “something” in the transmission and that something is only working intermittently now.
OP
Trans shop recommending a rebuild? This is a first.
OP