Thread: Transmission Slip in low gears- Slip on stopping and acceleration

What car do you drive? And how many miles?

To me it sounds like you're not really describing a slipping problem, but a no forward problem. As if it's in neutral until it bangs into gear, meaning there's not much slipping going on. This is usually caused by worn out Input clutch piston. It's inner surface wears out and the seal no longer, well seals. The increase in RPM's increases fluid pressure or flow by a little, which is enough to finally engage it. Changing the fluid normally doesn't help at all, and sometimes makes it worse because new fluid may be a little thinner. Unfortunately the Input clutch piston is pretty far into the transmission, and at that point unless you're confident the rest of the trans is in good shape, and you can change it yourself to save money, you're going to need a rebuild. You could try replacing a quart of your fluid with Lucas transmission stop slip. It will definitely help, but I'm not sure if it will solve the issue.

http://tripleedgeperformance.com/No-Forward-Cold.html

The input clutch piston isn't a common thing to replace in a rebuild. It has to be inspected, and ordered separate if it is found to be worn, so it may be original. What do you mean transmission control solenoid? You probably mean shift solenoid for 1-2. I'm not sure if that can cause the problem you're having. Someone who knows more about 4t60e's would have to stop by.