another 4t60e issue

[JMo60]

My car just started having problems with the 1-2 shift mainly, but the other shifts feel different too. Under normal acceleration, the trans seems to pause for a second and then clunk into second gear. the 2-3 shift feels like it might do it a little too, but its hard to tell. the 1-2 shift is more noticable.
At WOT it does it too, but its not quite as dramatic, i was starting to think it may be the vaccume modulator, but im still lost.

[sharkey]

possible that its the vaccume mod. pull the hose off and see if there is fluid in it. if so, replace it, if not you have internal issues.

[JMo60]

im gonna try a new modulator, i have a ton of them.. this is my 3rd transmission that has crapped on me in this car. i go through 1 trans a year, getting real annoying

[3400-95-Modified]

Its the nitrous trust me... I'm having the same problem now. Or a similar one.

[JMo60]

I assume it is nitrous related.. it used to do this only when i was on the spray, i didnt think anything of it, now that its doing it even worse at just light acceleration, im worried. i changed the modulator, but the one i put on it may have been shit too... im gonna try another...
the reason i think it is the modulator is because it is worse with lower RPM. and at wot it seems decent... i havent been on the spray since..

[3400-95-Modified]

My car will, at WOT when trans cold, snap into second gear so hard the tires will break free and start spinning... this is N/A too, no spray... Once its warmed up it goes back to the normal shifts, still somewhat firm due to the transgo kit I have installed.

[JMo60]

My original trans used to shift real hard only when it was cold... i ended up grenading the insides about a month after it started shifting hard when cold. My 2nd trans never gave me problems untill one day when first gear slipped so bad i couldnt accelerate over 25. now my third trans is starting to have issues with first gear... i think im gonna take one of my old transmissions and attempt a rebuild. I dont really know what im doin, but where theres a will theres a way...

[3400-95-Modified]

Get a ATSG book... it's a good start, I have never been inside one of these and I'm getting ready to take the one thats in the car apart to fix it up, since my other core grenaded a roller sprag, and I don't know how good all the other hard parts are in it, plus the 94 has the 3.33 dif, so I can get a 3.33 fdr with 35 35 chain setup, rather than my 95 core with a 3.29 dif, I know not that much of a difference but I would rather have a 3.33 if I'm gonna change it.

[SHOoff]

My 4t65E-HD does the same thing when you gas it right at about the 1-2 shift. It'll act like it's half shifted between gears and then BANG, and squawk the tires a bit. Stock tranny.

I found this for it. "Vehicles with a 4T65E (and -HD) transmission often have complaints of soft up-shifts (especially 1-2), delayed reverse and low line rise. This can be traced to the OEM boost sleeve assembly wearing." Intense-racing sells a new boost valve for it.

Is it possible that there's some sort of problem like this with the 4t60e?

[3400-95-Modified]

I'm sure thats what it is, my valve body is probably shot... But I don't know where to get a reliable rebuilt one, and new with pump is close to 500 from gmpartsdirect... Too much if you ask me.

Sonnax also makes fix boost valves too... But I dont feel like fixing a valve body that has over 200k on it.

[SHOoff]

Hmm... I cant remember what it was, but there's some reason that the 4t60E controller wont run the 4t65E. Otherwise i'd say swap to the 4t65E-HD.

[3400-95-Modified]

Gear selector range I think....

I belive the 4t65e's are D 3 2 1 mine is OD D L

[JMo60]

your 4t60-e has a selection of OD D L? my GP is D 3 2 1... Interesting

[3400-95-Modified]

Yeah thats the L-body selector... Lucky me... I think the channel plate is whats different. Because the gear selector connects to a valve in the channel plate... Who knows.

All I know is valve bodies are listed for all applications for like 93 up to 99 for the 4t60e...

[JMo60]

well im gettin ready to tackle this rebuild. the transmission is still slipping badly in first, and i occasionally loose overdrive... i cruise the expressway at too high of rpms, i turn the car off, let it sit, then drive agian, and then my lockup is back??? strange, but the rebuild sould take care of issues