4t60e Oh Joy

[loner666]

Well I know someone will say Im crazy but a stock 4t60e cant hold up to my turbo hybrid.. I lost my second one since the install the last week of Dec. last night..................

[IsaacHayes]

What happened to it?

[JMo60]

hey, i have been spitting tansmissions too ever since i but the bottle to it.. and i dont really hose it much.. 5 transmissions in 4 years

[IsaacHayes]

those transstar rebuild kits dont have the blue clutches in them do they? I'm assuming those are extra cost..

[loner666]

two transmission in 3months.....

Clutches seem to have went out this time. Was moving fine, slowed for a light, saw some smoke come from under the hood and the car wouldnt move. Had to rent a truck and dolly to get it home cause it was 30miles from home

[IsaacHayes]

You need to open it up and see all what failed... It may be bad seals and worn valve body killing it. A fresh rebuild with bumped line pressure, and modified accumulator would benefit. Blue plate clutches too. Hardened parts on the stuff that fails stock.

Are you running a trans cooler? What temp does the trans read at? Does it ever get really high?

[1988GTU]

Try some type F fluid.

[loner666]

Does have a cooler on it. My temps always stayed below coolant temp but would sometimes get above that in traffic. It should have been staying plently cool right before it went but Im not sure because I left my laptop at home so I wasnt watching anything at the time.

Im sure its the clutches but im not sure. The fluid doesnt look TOO bad but it is off alittle and does smell a bit burnt. The most confusing part though is that I cant even free rev the car in park. It bogs and wont go past 3k like it was in gear and you would loading it for a launch.....so maybe the torque convertor went?

It wont be getting pulled for a while. Might actually be selling off a lot of misc. stuff from the car so I can get it fixed again and get my truck going because right now I have nothing to drive

[IsaacHayes]

Bummer. Maybe a hard part failed? Or the converter.

[loner666]

not sure. im thinking either the convertor or the clutches. im thinking convertor more then anything from the way it acts even in park

[gpse3400]

the transmission is still stuck in gear if that's whats going on...I think somthing went awry in the pump/VB or the 1-2 band is stuck on.. Plus I'm sure you threw fluid everywhere since you saw smoke....

[IsaacHayes]

If DHP shows converter slip, you can use that to see if the converter is messed up or not. I know with my OBD1.5 I can scan that and see how much the slip is in RPM.

[loner666]

Its not stuck in gear. When its in Neutral it will roll around just fine but put it in gear it doesnt move at all, even if parked on a small hill. I did see some smoke but not sure where it came from other then the dipstick tube but the trans is still full and everything else looks normal.

DHP does show TC Slip. At idle is shows full slip (what the idle speed is) which I would guess is normal

[3400-95-Modified]

I'm just lost on how you guys have so many problems with these transmissions...

Mine I rebuilt with the trans start kit and put about 40k on it, the beginning of its life was Bfest 06, then the drag strip visits, putting down 13.818 on the bottle... many highway 100 shot NOS hits and fun runs... burnouts, Autocrossing, and daily beating... and yeah its still going strong and I can still chirp second gear. Only thing I'm loosing is the 3-4 shift firmness and I think thats because the 3-4 accumulator springs broke since they are original 94 ones. It also then put up with my Hybrid motor for 15k not as many nitrous hits on that one but it was a 220hp motor give or take a few.

Did you use your original torque converter when you changed transmissions?

[IsaacHayes]

I've heard of a lot of fiero builds with turbo 3.8's and LT1's, etc with rebuilt 4t60-e's so they gotta hold up if you build them up. I'm guessing that these are failing due to worn valve bodies, and old hard seals. I know mine was giving me problems but after the GM conditioner it has been great. I'm sure I'd get more power to the ground with a rebuild but for having over 200k on it I can't complain. If I were to turbo/whatever I'm sure mine would croak pretty soon but for being nearly stock it's holding in there. A fresh rebuild and it would handle more abuse.

Just cause loners last one was a low mileage unit doesn't mean the seals are not hard from being old. The years can add up on parts like seals, not just the miles.

What's odd is mine is no longer hitting the rev limiter on the 1-2 shift. It's shifting fast and smooth as ever all of a sudden. I may be down on power as it doesn't seem as zippy for some reason, especially on the low end. I almost wonder if it's the cat being old and clogged as after a lot of WOT down-shifts on the highway it will do better. I wonder if the extra pressure blows out some carbon out of the converter or something??