Tranny Temp Question
Post Fiend
Joined: Oct 2003
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From: MICHIGAN
Originally Posted by Tazzmann
Still trying to figure this out, over the weekend I pulled a 2000 lb trailer and after an hour in 100 deg heat the tranny temp was 220 deg. This is so frustrating!
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WHATS YOUR rpm, if the torque converter is not locking up then you'll have fluid sheer in the tourque making it heat up.
As for me, my transmission temp I read off the side plug of the tranny, I'm pulling 178-180 sometimes hitting 190 on 98 degree days city driving, 180 highway driving, 180-185 pulling at cruising speed loaded 14,000lbs all on the prairies.
You say you had a blockage, pull your lines at the the tranny, reverse flush the lines, you'll figure out which line is to your coolers by driving the truck, get the tranny hot, shut her down for 15 minutes till the lines cool down, then get someone else to start the truck with your hands on both lines, the first line to get hot is your exit line, so on the other line blow out your coolers.
If you had crap get into your liquied to liquid cooler, very good chance you have crap in your lines, sounds like your having a flow issue in your lines.
As for me, my transmission temp I read off the side plug of the tranny, I'm pulling 178-180 sometimes hitting 190 on 98 degree days city driving, 180 highway driving, 180-185 pulling at cruising speed loaded 14,000lbs all on the prairies.
You say you had a blockage, pull your lines at the the tranny, reverse flush the lines, you'll figure out which line is to your coolers by driving the truck, get the tranny hot, shut her down for 15 minutes till the lines cool down, then get someone else to start the truck with your hands on both lines, the first line to get hot is your exit line, so on the other line blow out your coolers.
If you had crap get into your liquied to liquid cooler, very good chance you have crap in your lines, sounds like your having a flow issue in your lines.
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Thanks for the responses guys, I did check to make sure there were no obstructions. Both of the coolers are right behind the grill so there is a good spot. I'll have to try to blow the lines out again and see if there is an obstruction, the coolers get real hot to the touch so I know there is some flow.
David my temp numbers seem to match your up until I pull a load of any kind then it just seems to steadly climb up into the 210+ range, I'm generally running in the 2500 rpm range on the freeway commuting to and from work, how will I know if the torque converter isent locking up properly?
David my temp numbers seem to match your up until I pull a load of any kind then it just seems to steadly climb up into the 210+ range, I'm generally running in the 2500 rpm range on the freeway commuting to and from work, how will I know if the torque converter isent locking up properly?
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Originally Posted by Tazzmann
David my temp numbers seem to match your up until I pull a load of any kind then it just seems to steadly climb up into the 210+ range, I'm generally running in the 2500 rpm range on the freeway commuting to and from work, how will I know if the torque converter isent locking up properly?
what gear ratios do you have, I have 3.54 or 3.55's, jeez I cant remember now, I need my morning coffee, any ways, at 70mph I'm running at 2000rpm give or take.
Baically watch your RPM on the highway, when your cruising lets say 70mph and you give it some throttle your rpm should nicly increase at the same rate as your speed when locked up, if your cruising and you step on the throttle and the rpm jumps up when you step on the throttle or decrease quite a bit when release your tourque converter may not be locking up.
for my tranny, I start in 1st gear, 2nd gear, 2nd gear torque lock up, 3rd gear instant lock up and 4th gear instant lock up like driving a standard. Thats empty of corse, have not had the chance to pull a trailer to see what happens since I changes all my springs and my selinoid pack to the stage 2.
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The easiest way to tell if your torque converter isn’t working properly is to take it to a reputable transmission shop and have them check it out for you. Usually a quick test drive is all it takes.
Another thought comes to my mind. You don’t mention your driving habits when towing. My experience with a tranny temperature gauge while towing is that the torque converter unlocks very quickly if too much power is delivered by the engine. I learned that I could never do more than just barely crack open the throttle or the temperature would start rising immediately.
Keeping the fluid temperature down became a dance between careful throttle work and manually downshifting anytime I needed more than just a moderate amount of power. It became so frustrating that when I went looking for my last truck the only specification that was non-negotiable was a manual transmission. It is crazy to have that much power under the hood and not be able to use it without toasting the transmission.
Another thought comes to my mind. You don’t mention your driving habits when towing. My experience with a tranny temperature gauge while towing is that the torque converter unlocks very quickly if too much power is delivered by the engine. I learned that I could never do more than just barely crack open the throttle or the temperature would start rising immediately.
Keeping the fluid temperature down became a dance between careful throttle work and manually downshifting anytime I needed more than just a moderate amount of power. It became so frustrating that when I went looking for my last truck the only specification that was non-negotiable was a manual transmission. It is crazy to have that much power under the hood and not be able to use it without toasting the transmission.
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Originally Posted by zephcom
Another thought comes to my mind. You don’t mention your driving habits when towing. My experience with a tranny temperature gauge while towing is that the torque converter unlocks very quickly if too much power is delivered by the engine. I learned that I could never do more than just barely crack open the throttle or the temperature would start rising immediately.
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Ok after further studying and callng around it seems that the torque converter is the culprit with the tranny acting wierd. Ive allways just assumed it was tranny slippage but it looks like more the TC. Whats a usual price on these, or what kind of options do I have? I dont mind putting the work in and changing it myself.
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Originally Posted by Tazzmann
Ok after further studying and callng around it seems that the torque converter is the culprit with the tranny acting wierd. Ive allways just assumed it was tranny slippage but it looks like more the TC. Whats a usual price on these, or what kind of options do I have? I dont mind putting the work in and changing it myself.
Last edited by DAVID'S97F250HD; Jul 27, 2006 at 12:31 AM.
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