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Discussion Starter · #1 ·
I'm gonna put a TH350/203 behind a '98 4.3

For anybody who has done this i have a few questions:

1.have you had to change the flex-plate or will it bolt up?
2.does the computer throw codes?
3.if it does throw codes does it retard timing or mess with idle?
4.will i need to change torque converter since it was behind a 350?

Thanks a bunch in advance
 

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Discussion Starter · #4 · (Edited)
gravy, i was afriad they changed something on/about the flexplates. yeah....not i'm not too woried 'bout it throwin tranny codes, along as it will still idle correctly in gear
 

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I have never installed a th350 behind a 4.3 but have done a th350 behind a tpi. I didnt have any issues what so ever, The only issue was geting the speedo to work.
 

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Discussion Starter · #6 ·
kewl.... well i'm gonna dry fit it this week, and if everything goes right gonna bolt it up and run it around the shop. I'll post up results......
 
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