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I need to buy a tranny for my 4.3 that is going into a 84 toyota, and I need to know if any th350 will fit this motor, or does it need to be a th350 from a V6?? Also, my t-case output shaft needs to be on the pass. side. Again, Will any np203 work, or do I need a specific one, year, make...????
 

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It needs to be a th350 from an i6, 4.3 v6, 305, 350, 400 or big block truck. Buick/Olds/Pontiac/Cadillac powered rigs need not apply, as the bellhousing pattern is different.

All 203's I know of are passenger side, but I rarely get outside of the chevy/dodge world myself.
 

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Make sure you get a TH350 that had a 203 behind it. It has a shorter output shaft. 27 spline. Find a 203 from behind a TH350. The 203s from behind a TH400 have a larger input shaft
I have a 203 with a TH350 adapter if you need one
 
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