Hennesssy

iTrader: (14)

Hey guys, my transmission happen to fail on me when I tuned my car, and I'm not making serious power.

I can't put it into park or reverse and would get stuck in gears. Check engine light would go on and I have a code for it something P1 ..forgot the code. After awhile the check engine light would disappear.

Transmission only have 107k miles and did the fluid change at 90k miles.

However, the guys at the shop did changed my transmission fluid to redline to see if that would help but it didn't.

I was thinking about using a TT Supra Auto transmission, but I don't know which route to go.

Anyone know a place that does upgraded transmission in Socal or have one for sale?

99 GS3

iTrader: (14)

You don't give enough details about your engine build and what is serious power?

You can't just swap in a 4spd TT auto into a GS300 running on the 5spd GE ecu.

RamAirRckt

If you use manual shift mode (manually shifting) a lot (down shifting) that is hard on any trans, doesn't matter who makes it. The way the trans downshifts is usually pretty hard on the parts, I forget which bites it.

With std Toy T4 fluid, changing every 50k is good advice, if not every 30k. With synthetic fluids (real, not hydrocracked group 3's) you can go much longer.

SaiyanGS3

iTrader: (8)

Very true. I'm just using T4 and doing drain and fill every 30k. I don't plan on buying a tranny for this car.

JeffTsai

iTrader: (1)

Sounds like you possibly fused the forward clutch assembly. Did you do any really hard launching or possibly drop it into drive a few times when the RPM was still high(aka neutral bomb)?