So a few weeks ago my Transmission oil cooler sproited a leak and bleed all over the road, around 2-3 quarts. I mmidiatly got a new cooler (not OEM) hooked everything up and put some more fluid in. I added around 3 Quarts of ATF4+ to bring it back to normal operating range on the stick. Since then, Ive noticed some pretty bad tranny slips in low range RPM's around 38-46 MPH. Transmission Temp is Normal, around 130 on hot days, around 115 on cold days, under a load or high RPM's it shifts perfect, but if im going slow, it cant decide what gear to be in.

-I dont know what the previous owner ran for Tranny fluid, i assumed since he had it built with billit converter and input/output shafts he put the fully synthetic ATF+ in it. if not, would this cause an issue? (Should i drain it all, change filter, and re-fill)


-When I changed out the cooler, is it possible air got in they lines or in the converter and its not filling up the way it should?

-My last 3 Cummins were all Manuals, this is my first experience with an automotic so any information or suggestions is greatly appriciated!

 

Sounds like a filter issue ... I would drop pan and filter and service it .... Adjust bands and such while there that way you know they have been adjusted properly..

 

Thanks for the input. I'm going to try this first and knock it out this weeked. Now with the bands, is there a write up, or can you explain how i need to adjust them? Thanks again for the help.

 

Tighten up to 72 inch pounds .... Turn front one back 3 turns and the rear one is 2 turns ... There is a right up here somewhere ... Go in to the search and look for band amusement

 

here you go
https://www.atsdiesel.com/additional...ent%20v1.0.pdf

 

Check your rad/overflow for signs of oil contamination. Depending on how it failed you could have coolant in the trans now and that is what's killing it.

 

did you check the fluid level with the truck parked in neutral with the parking brake on, engine running and at operating temp?

IF you check it in park it will read full on the dip-stick when it is actually 2-3 quarts low.....

 

And if you have coolant in trans ... Its fu#$%d .... No way to fix bit a full rebuild ... Coolant contamination in an auto is automatic death .... I used to hate pulling them apart ... Sometimes the stuff would be really sticky and it was goopy ....

 

May be dumb, but how would transmission get contaminated with coolant ? The oil cooler and lines are separate from the radiator.

And yes, I checked fluid in neutral, it's good.

Thanks for the link to the write up, if it ever stops raining this weekend I'll be draining the pan. Thanks for all the help guys.

Sent from my SAMSUNG-SGH-I537 using Tapatalk

 

The coolant/Atf exchanger right behind your turbo .... if the cooler starts to leak coolant into the tras side .... Big issues ....... this is why most guys ditch it and get a good cooler with a fan .... all better