BinaryJay

Most of the people on this forum are regular drivers and not experts, the fact you've gone as far along with this as you have says to me you know more about this than pretty much anybody else here already. I think you need to get access to TIS and do the research there, if there is anything that can be known in any official sense it will be there.

ta1972

iTrader: (1)

I had the car for 2 years. The current miles in 145k miles. About 7 or 8 months ago did the trans drain and fill about a few times.

gr8fulRed

had fluid been changed prior to you doing it? How many miles were on the car when you changed it?

ta1972

iTrader: (1)

I did it 7-8 months ago. Don't know the exact mileage on the car at that time.
I just ordered a used low miles ecu. I'm really hoping this will fix it. If not, this will suck big time.
If it ended up being the ecu, why was no symptoms right before I raised the car back up to stock.
The only thing I transferred from the jdm trans was the neutral safety switch.
Maybe the neutral switch is bad? I'm really hoping it's the ecu, since if just ordered it.
This is a mystery.

ta1972

iTrader: (1)

It's finally fixed. Ecu was the issue here. It really pissed me off at first when I replaced the trans to find out it wasn't the issue. Oh well. Now my car runs super smooth with the low miles trans and ecu replacement. At first, didn't know whether the ls trans would fit, but everything worked out.

tunedis95

Big props for your exploration with this swap.

I've been looking every now and then at the cost of used engines/ transmissions in case i wanted to swap to a lower mileage engine that is, if I ever ran into problems with my original. Nice to know the transmission is a direct swap. Glad you resolved your issue, I would have thought it was the transmission too. I'm very thankful I haven't encountered any major issues with my 2006 GS430 w/145K Miles. (knock on wood)

ta1972

iTrader: (1)

If u ever do a swap using a ls or sc430 trans, just change out the neutral switch.
I changed mine, because the part number was different.

XxGoKoUxX

o0o, maybe I should have responded to this a little earlier than I did.

Sorry for not getting on this though..... I recently had a friend with the same issue, he would stop, then the car would jerk forward a bit, then stop again..... It turned out to be the brake's ECU. I told him to do check the ECU just because I figured it was glitched, He took it to the dealer, the dealer took the brake's ECU from another car and swapped it onto his car and it was gone. Bought a new ECU and that was the end of his problems since, his car's now at 2xx,xxx miles w/ zero problems on it. It was passed onto his brother .

Hope this helps other future CL users out later on.

P.S. The dealer was stumped when they kept testing and gave up until I told him what it might have been haha!

tunedis95

Nice, thanks for the tip. I almost feel as though I would just swap transmissions, rather than pay somebody I dont trust $2k to open up my transmission and rebuild.