94XRolla

i have a 94 z28 with the 4L60E trans. 4 speed auto with 1st gear lockout removed... recently the trans was professionally flushed and everything was fine for about a week, now it has a hard shift from park or neutral to forward drive gears, reverse is fine, all gears seem to shift fine when in motion until its time for the drive to overdrive shift, it tachs out on the interstate and doesnt go into overdrive, but when its in drive not tach'd out, and you floor it, it downshifts ok... i have read its possibly a shift solenoid that runs off vaccuum pressure or possibly the pressure block itself being stuck? or even the torque converter......anyone with these same problems or know anyone with em and a solution or troubleshooting checklist? or would i be better to just take it to a transmission shop and have it looked at? only thing i can really find out beyond that is everyone saying junk the 4L60E and do a custom TH-350 swap with fabricated overdrive gear..dont have that kind of cash for that, or even a new transmission seeing how they run average $1200 not including labor.. need help!

Spindrift

How many miles are on the tranny?

94XRolla

about 70, 000 assuming its never been rebuilt and its the original.

Spindrift

Nevermind then. I know with automatic trannies you could have a problem with flushing out the fluid because sometimes all the old gunk is keeping everything sealed up and held together. But seeing as yours only has around 70k I dont think the trans flush was the problem. See if anyone else on here can help you, if not id take it back to where you got it done and talk with them. If that doesnt get you anywhere then yea, id take it somewhere else and have them take a look at it. Sorry I couldnt help you out more.

nickyroo

i really dont know too much about 4l60e's since i have a t56 in my car, but i guarantee someone on http://web.camaross.com/forums would be able to help you out. register and check it out