Deciding on a transmission for an LS swap? Carl, Summit Racing’s tech expert, explains what you’ll need to boltup an earlier GM transmission (like a Powerglide, TH350/400, 700R4, Muncie, Richmond, Saginaw, etc.) to a GM LS engine. You may be surprised how straightforward the job is.
Installing an automatic? You’ll need a new flexplate: https://www.summitracing.com/search/p...

Manual transmission installs require a new flywheel: https://www.summitracing.com/search/p...