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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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I run a th350 behind my 2000 4.3 and have no issues. The converter bolts right up to the 4.3 flex plate. Mine throws tranny codes but I've never had any problems, at any rpm.
 

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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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