Re: 4l60E question
1999+ 4L60's have a TCC that is meant to slip under light load. Shouldn't be an issue going to one that just locks the TCC. 96 and later all use PWM TCC control.
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1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205
1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears
1996 Chevy Suburban K1500 350/4L60E
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