The 4L60 is the same as the 700R4, just better components.
The 4L60E is the electronic one. However with an electronic modual it too can be used in a third Gen.

 

just my .02

I have had 3 TH700r4 my next tranny will not be one...I hope if so I guess I will pay 2000.00 to get it bullit proof...

easy to put in would be the 700 first...then the 4L60...then the th350and th400 the manual would be the hardest to do...(your car is not manual now)

BUt a Munaul would be SWEET! and a lt-1 T56 is very strong....stock will hold 450HP all day long....just get a stage III clutch

as far as TUFF!! a powerglide and a then a TH400....you WILL not break that with a L98 even if you ran 11's with NOS....that is serious hardware... a th350 uses less HP then a th400, but a glide use less than a th350.... BUT all of those trannies have less gearing than you 700R, so your 1st gear ratio will change for the worse...and your gas mileage will suffer....

BUt a T56 will give you good gas mileage and good gear ratios.... and well has uses very little HP.... BUt will cost the most.

If you are strickly looking at a track car...1/4 and Th350 with a 3000stall will Kick butt with a pair of slicks....


Well you have alot to think about.....


just my .02 cents

 

Rebuild from Rossler Trans cost about Stage $1295 Stage 2 $2195 Stage 3 $2695

400 for stage 1 Stage 2 and 3 are machined for higher power and have different clutch pack sizes. Call them

 

well i decided not to buy that car, it needed a lot of work, and I didn't think it was worth the price. I bought a 86 camaro iroc z with a 350 TPI from a vette. it was driven buy a older guy that just recently died, so i know the car was treated nice. But thanx for all the info on the transmissions, I might need it in the future.