mikgills
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Re: trans temperature downhill
Ibrjet Those are decent temperatures for grades. I hope to get mine down there or even lower. Did you pay attention to tranny temperatures AFTER you went over the passes? Did it go down with engine temp or did it continue to increase in 2nd gear? 2nd gear downhill does not cool down like the engine temp on my roadTrek B motorhome. Usually 3rd gear is to fast on the downhill with the weight (8600#). to much braking to keep speed in check. Im trying to determine if this heat in 2nd going downhill is normal or whether I have clutch slipping generating all this heat (in addition to T.C.) What kind of cooler is your truck equipped with? Seems to be doing a lot better than mine. I wish I had a manual tranny!! More control.429Views0likes0CommentsRe: trans temperature downhill
Shadow, Yes Im inclined to believe that also. Trans temp going up on descent in 2nd gear kind off threw me a curve. I was expecting it to go down not up. Apparently T.C. friction in 2nd gear is the same ascending or descending without enough cool down time in-between. I was afraid something was slipping and burning up. Wanted to increase pressure to prevent slippage. Ive been looking at cooler/fan plate combinations from Derale, B&M, Cool, and a few other builds. Van chassis has almost no room in the engine compartment which is already jammed full. May have to relocate a few items and make room. Anybody tried the cooler/fan combos? How much difference did you see?429Views0likes0CommentsRe: trans temperature downhill
yes, I can feel the mini shift and see a 200+ rpm drop when it engages. Now that i have the tech1 diagnostic computer i can hook that up and verify T.C. function, but it feels like it works fine on the flats (I live in Florida, we have no mountains to test with). I had the tech1 hooked up while driving the last time in the smoky mountains (hills). Part of my problem is the 350 engine is barely adequate in the mountains so Im in 2nd gear to much of the time which generates a lot of heat. Doesn't have enough torque to stay in 3rd and its reving in 2nd. (needs a gear in-between those two). I try to to keep it at peak torque but with the wide gear spacing, thats difficult to achieve.429Views0likes0CommentsRe: trans temperature downhill
Sorry for the delay (went to spam file) Answering questions: after temp gauge was installed 245 degrees (trans, engine temp is fine). Radiator has been flushed but never rodded. using IV trans oil (VI came out after this was built) going to try synthetic next change. cooler is mounted in front of A/C condenser. Changed ATF after every trip (its no longer red and smells burned) Going downhill I sometimes smell hot oil. I noticed fresh oil around driveshaft seal after that. Some dripped on exhaust. Cleaned area up, no more leaking. I think it was from excessive heat. New issue, but only because I did not have trans temp gauge before. Added the gauge because it went into limp mode (2nd gear only) 2 times in Canadian Rockies (steep ski resort area). Changed oil and filter immediately in next town. Ext cooler is factory 11" X 5" stacked plate. Seems rather small but i read stacked plate type are the most efficient and are not very big. Has H.D. 1 ton cooling option but I was told by chevy the aux cooler is the same no matter what extra cooling was ordered. that makes no sense to me. Added gauge has sender in pressure test port. Compared temp readings with GM tech 1 diagnostic computer and temp on the flats is within 5* (165-185) In the mountains tech 1 reads higher and increases and decreases faster, but sender is internal for that one. Hope i answered everyones questions. thanx Mike429Views0likes0Commentstrans temperature downhill
I have a 95 Chevy Roadtrek 210 (G30 ext) 4L80 trans. HD cooling and factory aux trans cooler. On long uphills engine temp and trans temp climb, as expected, but on the downhill engine temp goes down while the trans oil keeps going up (2nd gear). Pulling over and reving up rpms only helps until the thermostat fan disengages. After that i have no cool down and temp remains high. I have flushed the oil coolers (2) and changed trans oil every trip but same thing keeps happening. Did not know about this before adding trans oil temp gauge. trans has gone into limp mode a couple of times before adding gauge (reason for adding gauge), No service engine light. It appears the 2nd gear even on decent increase the oil temp rather than decreases. Any body else notice this on 4L80 trans? Fan is working as it should. What can be done to prevent the increasing temp? Any experience with this tranny running hot? (95 does not have tow/haul mode). (115K miles)4KViews0likes20Comments
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