Im about to work on a 4l60, but i dont know if its a 4l60 or 700r4. the output shaft is a 27 spline. i havent counted the converter splines. anyone know if this is a 700 or 4l60? ive heard one of the biggest differences is the # of splines. as far as i know its out of an 89, but the valve/plugvalve body looks like an early 80s one. its a custom application for a limo, and its got to hold up to the weight. if it is a 700, should i tell him to junk it and get a 4l60?

The 4L60 was created when GM changed their transmission nomenclature. Functionally, it is the same as the 700R4. The 4L60E is totally electronically controlled.

700R-4 in the limo. What ever you decide make sure you have control of lock-up and the throttle pressure is exact. All heat in the trans is generated in the converter and driving at highway speed in overdrive without the converter locked up will super heat and fry the unit in short order.Any good rebuilt unit will give you many trouble free miles.You won't need racing frictions,put a corvette servo,plug the bleed hole in the drun with a bb,use good atf and hang a cooler on it.We put over 100,000 miles on a 92 streached towncar with a AodE in it.

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