I have a problem with my new transmission just want to get some thoughts. I just went to utah and back to go crawling towing 11,000 lbs and when i tow in 3rd at 55-60 at 2600 rpms the trans temp is 150-165. and 180 on grades. but i did pull 250 over passes then came back down. but anyways if i put it into overdrive the temp with in 10miles just goes from 150 and climbs to way beyond 250. and just keeps building . so i couldnt used od on the trip which stunk for my ears and fuel mileage.2600rms + strait pipe stacks ona regular cab= loud for 6000miles. in over drive at2000 its fine. 8mpg apposed to 11mpg when i can use o/d. the truck has no problem pulling in o/d at 2100 rpms it dose 65-70 and is not lugging or really working hard. so any thoughts??
has a bd valvebody perfect shift tourque converter and was just rebuilt. with all the best bands and clutches i could get.
JonD

 

Sounds like a TC problem......If I were to guess, it does not sound like your lock up is working properly or is slipping really bad.....the OD gear itself, really won't generate any heat - most of it comes from the converter and tranny temps should drop noticably when the lock up engages. Sounds like you have to go back to the tranny shop!......If the lock up was trying to engage throughout the whole trip towing 11,000 lbs, it will be fried now and there will be a noticable amount of lock up dust in the pan. IMO, the problem should be obvious to a tranny tech.

 

Something's not right.
On the highway in OD, I barely get 140* on mine.
Time to call the tranny shop.

 

With my stock tranny I can hit 180* in the hot line but that's about it. Even after screwing around. Once I hit 70 on the freeway and everything is locked up, the temp drops. Sounds like your not locking up.

 

I am pretty sure it is locking up. it locks in 3rd and when it goes to overdrive i can hear it loc also with the tone change. i have a bd torque lock so i can manually loc it. with it on sounds the same as when in stock mode so it has to be locking or the tone would change. I am going to try running synthic and a deep pan. maybe this will help. I went to the guy at the tranny shop that did it today and said i shouldnt tow in overdrive over 10,000 lbs and chrystler did not recommend it. so if this does not work i will have him do somthing. the thing is fine with out a trailer so maybe fluid ??? is quaker state atf +3 bad stuff??? i am going to run amsoil synthetic as soon as i find a place that sells it in mass. around me.
jond

 

Well, if the tranny is equipped accordingly, you can certainly tow 10,000 lbs in OD!! Lots of guys do it here - me too! Synthetic ATF will not help your problem......by far, the majority of the heat produced in the tranny comes from the TC - but not when it is locked up........the heat is generated from a slipping TC...

 

You need to find a new transmission shop that has a clue

 

They're saying you can tow 10k lbs in OD? I'd find a different shop if I were you.

 

I know i can tow that much in OD .I am ATRA certified and should have rebuilt it myself. but the tools were too much that i didnt have at the time. the guy who built my tranny said that thats a lot of weight for overdrive and to tow in 3rd.I am going to go synthetic anyways cause its time to change with a deep pan. the loc up should be fine because it still works. I will find a new trans guy and see what he says. i hate to buy a different converter cause i payed alot for mine.
Jon D

 

The reason they say not to tow in OD is because with a stock engine the torque is low enough, at overdrive RPMs, that the tranny will hunt (drop out of OD for every little hill, unlocking and locking the TC), and that's not good for it.
If you engine has enough torque in that RPM range, and your EGTs aren't out of sight, you can tow all you want in OD. Now there is also the possibility of slippage, if a stock OD unit, which may be another thing they are worried about, since at the lower RPMs the line pressure is lower. If you have turned up the LP in your VB, you should be OK.

Back to the TC. That sucker isn't locking, or it's slipping. Try it again when you can, and when the temp gets up there, floor it (not enough to make it kick down though) and see if the RPMs go up faster than the speed.
I had my ATS Triple-Lok slipping on me, whenever the hot line got to 180 or better, but it turned out there was a problem in the VB. Replaced the VB and no more slippage, no matter what the hot line temp is.

Chris

 

Theres only 2 ways your going to build that kind of heat...
1: your TC aint locking or
2: your TC aint locking
It may be too low of line pressure allowing it to slip even though it seams its locked as Stamey said . You said it got up to 250 while in 3rd lock up, I would say it was slipping there too. Thats way to much heat for a converter thats locked up properly. You need to address this pretty fast because those cluches wont last long if they are slipping due to low line pressure Just my $.02

 

3rd gear lock up is fine towing it runs at 150 in the hot line, 165 on grades when locked.even towing 1200lbs I am going to play with the line pressure today. it is just overdrive. it might not have enough tourque like you said with the stock engine. even though the egt is fine.I didnt tow the whole trip like that. soon as it did it once i towed the rest of the way in 3rd. my 50hp injectors are comming next week anyways so well see if that had a part in it. thanks for your help guys.
JonD