th400/th350 adapter Q's from a noob - Lexus IS Forum
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post #1 of 3 (permalink) Old 06-12-2019, 01:35 PM Thread Starter
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th400/th350 adapter Q's from a noob

Tranny is done for in the 2001 is300 of mine, and I happen to have recently rebuilt th400 and th350 sitting around in good shape. Yes I've searched and read all of the posts about the swap, and I have a really good idea of how it will all go down for the swap. The only thing is, is that mine isn't a big power monster for now, I dont want to have to buy the fancy 1000$ custom billet flexplate so I can meet up with my torque converter, I see plenty of "adapters" that seem to bolt up to the stock flexplate and extend out to meet up with the GM torque converter (kind of looks similar to a wheel spacer).

Are these adapters legit? Or am I having to go with the high horse custom flexplate?
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post #2 of 3 (permalink) Old 06-12-2019, 02:48 PM
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Originally Posted by Tsumms1 View Post
Tranny is done for in the 2001 is300 of mine, and I happen to have recently rebuilt th400 and th350 sitting around in good shape. Yes I've searched and read all of the posts about the swap, and I have a really good idea of how it will all go down for the swap. The only thing is, is that mine isn't a big power monster for now, I dont want to have to buy the fancy 1000$ custom billet flexplate so I can meet up with my torque converter, I see plenty of "adapters" that seem to bolt up to the stock flexplate and extend out to meet up with the GM torque converter (kind of looks similar to a wheel spacer).

Are these adapters legit? Or am I having to go with the high horse custom flexplate?
I would use a different flex-plate. They make them to bolt to the 2JZ and have bolt patterns for Chevy, Ford, or Chrysler patterns. The adapter work. But can break or come lose. Also are heavier than direct.

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post #3 of 3 (permalink) Old 06-12-2019, 05:23 PM
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Unless you switch to a manual transmission ECU or standalone. The car will never run right. The automatic ECU is unhappy if it can't detect the transmission solenoids and speed sensors. It'll probably never pass emissions if you care about that sort of thing.

You can pick up a used transmission of ebay for $500 to your local shipper. My guess is that it's all around cheaper to just get another Lexus transmission.
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