4r100 Question

[fishernoiter]

Hello, Just checking to see if anyone has had the same problem with their transmission. I was loaded with a camper and towing a trailer down a long road with a steep grade. To avoid smoking my brakes I used low gear for most of the 11 mile down grade. It was a warm day, when I got to the bottom of the grade and noticed I was leaking ATF from the fylwheel inspection pan vent hole. I never noticed any slipping or strange sounds. After sending a friend to get me fluid the next day, I had leaked the better part of four gallons coming down the hill! Having filled it back up, it wasn't leaking? I made it back up the hill before it started leaking again? This was a steep hill. It leaked for another 2 or 3 miles and has not leaked since? I have traveled 500+ miles since, but not with any load. The transmission does not slip and shifts fine? Is there a pressure relief valve or something? I don't have a trans temp gauge so don't know if that was the problem.

 

[wpfd571]

that kinda sounds like the front seal on the pump, i think if i remember right. i ran a 99 plow truck one year and when it got ran hard and got hot it would puke fluid from the same place yours is. we swaped seals and it hasent leaked since that was 2 years ago.

 

[trackspeeder]

Pump seal is bad.

 

[fishernoiter]

Thanks for the response. Was the seal difficult to replace or is this a job for repair shop with the special tools?

 

[wpfd571]

we pulled the tranny and took it to the shop, they replaced it while we waited. and i have no idea what it cost i cant remember