Hey guys, I have an up shifting problem with my C4. I can manualy put it in 2nd and 1st, but in drive it stays in 1st and wont up shift. I have vac to the modual. What gives here. Thanks Curt
I bought a Mustang once that had the same problem.
I started not to buy it, but the guy said he changed the filter and put Dextron fluid in it.
I said nothing as I paid him. I towed it home and changed out the fluid and filter with type F fluid.
It worked perfect.
Not saying that's your problem though, this just reminded me of that story.