I've got a built Corvette 4L60E w/billet solenoids, TransGo Stage-2 Progressive shift kit, and a 3200 stall (the brand is slipping my mind at the moment), there's about 5-10k miles on it since it was built and the fluid is clean and smells good.

Here's my question, when my engine/trans is cold it works great, shifts perfectly, seems fine. Once I've gotten onto say the freeway and run it really hard, or drive it around town and really heat up the tranny when I stop at a intersection it'll sometimes very slightly slip into neutral after a I'm stopped for a bit (over 15 seconds usually), and the second I even think about touching the gas or even just let off the brake for a second it's back into gear..

Any ideas, is this a serious malfunction, or just a nuisance? I just chalk it up to the fluid getting really hot and I maybe need to add a second tranny cooler?

Thanks in advance all!

 

Are you sure it's actually changing gears? Have you used a scan tool?

 

Well I'm not really sure about if it's an actual slip or a shift or what, but as long as I'm not hurting anything I don't mind it..

Also I should note when I release my foot off the brake, since the rebuild it'll barely roll forward, like if I'm on any kind of an incline at all it'll just sit there and not roll even when it's hot, but with the foot on the brake it'll sometimes do the neutral thing. It's never done it with my foot off the brake though..

 

Welcome to having a high stall converter...... cold fluid is more viscous allows more torque to be transfered to the transmission at idle.

 

I've always had luck with the Lucas stuff, I know additives are all crap blah blah, but technically it would thicken up my ATF so it should in theory give me stronger shifts (like I need it lol) and help when it thins out?

BTW, I am in Tucson and it does get a little warm here occasionally =)

 

Sounds like it is working correctly- you might want to put a temp gauge in there to see what it is running at-

BTW, with 10 k mi on the rebuild, I would at least drop the pan and clean the filter- I am a little **** about everything being clean and fresh- and that tranny just went through a break-in period-

 

Oh believe me, I've already dropped the pan on it twice and it got a new filter and fresh fluid each time, and in the next few months I'll drop it and change it again just to be safe but the fluid looks perfect in color and smell, and I couldn't be happier with my 4L60E.