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Originally Posted by Fasterthanyou
3rd: Cheapest high stall converter is one from a 4 banger s10 late 80's early 90's. These converters are 12" lockup but because of the v8 torque vs RPM it'll stall higher than it would behind the 4 banger. I would recommend a yank if you're set on keeping the automatic and do have an ET goal in mind..
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A torque converter from a 4 cylinder S10 wont bolt up to a SBC flexplate. However, a torque converter from a 4.3 liter V6 S10 will... I ran one behind my current motor when I still had the 700R4. It sucked monkey balls. It only flashed to like 2100RPM. It was so tight that my motor wouldnt even idle properly. Thankfully my 700R4 died after only a few test passes and rather than forking out $1000+ for a "built" 700R4 that'd probably die again, I got some sense and put in a TH350 that cost me $250, then gotta 9.5" Torco/Art Carr converter for $350. My Torco converter will flash at 3600RPM, footbrake to 2500RPM (with my crappy brakes and skinnies), but still drive just like a regular car. No "dynoing" effect at low RPM's, the car will even lurk forward at idle.
If it was my car, I'd ditch the 700R4 because its only going to give you troubles eventually behind that motor. I learned the hard way... Nothing crappier than getting your car back together then having to take it apart again. Jeff Mazzoni in Vineland rebuilt my TH350, pretty much a stock rebuild with good parts and a shift kit. $250, couldnt be more happy with it.