Uses transmission fluid


#1

2003 Chev S-10, 4.3, auto, 4x4. Uses transmission fluid, low vacuum, idles pretty smooth, but just doesn’t run good. Any ideas?


#2

If it’s not leaking on the ground then the only two places it can go is into the engine cooling system or into the t-case adapter between the transfer case and the transmission.


#3

Any chance that this transmission has a vacuum modulator? I think it’s too new for that, but if it DOES have one, I would say that’s definitely the culprit.


#4

It’s a 4l60e transmission, so it’s all computer controlled.

My brother has a Ford C6 that is sucking trany fluid through the modulator…it eventually puddles up on the passenger side floor from one of the heater control actuators. Never seen anything like it.

I asked him what he as going to do about, he replied ?open the door and let it drain out?


#5

Yes, GM products were famous for sucking out transmission fluid through a defective modulator. White smoke in the exhaust was a sure tipoff. Newer transmissions are elctronically controlled, so this one may not have a vacuum modulator.