Re: K20 with TH350/NP205
if your not driving it hard, I'd think you will be fine. I had a 79 Malibu that was a factory 4-speed Saginaw. I've heard and read everywhere that they were the weakest 4-speed GM built. I had a healthy 454 that I put in, guessing 400 horse. I can't drive a stick very good, more used to truck 4-speed and I have a CDL, so big truck tranny's. Well, I beat that tranny pretty good, and it would sorta hook, posi with 295/50s, but really romp in it will would spin. Tranny never even sniffled. A TH350 is definitely stronger than a Saginaw, tho it is in a heavier vehicle. But as mentioned, get a good cooler, maybe an inline filter, I think you will be fine.
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