Join Date: Jul 2001
Location: Brooklyn, New York
If you got 140k miles out of your 4L60e with those mild power bolt ons your should considered yourself very fortunate indeed!!
The 4L60e and it's 700R4 predecessor was always considered a glass jaw of automatic transmissions. It was designed to go behind weak SBC's like the old 305 and the smog motor era 350's of the 70's and 80's . That it why it has that extremely steep first gear to help those weak motors get the car moving. Only since the last ten and fifteens years has the aftermarket has some really good pieces like the Z-Pak, the Alto Reds(steels) and the Beast Sunshell, etc to make the 700R4/4L60e take some serious horsepower and torque.
Mine went out soon after Bryan Herter put in a mild power tuine at one of my club's Mod Days. The 3-4 clutch pack went out, a common occurance with these transmissions.
So count your blessings
1995 9C1, 3.73 gears, TruTrac LSD, Hellwig front swaybar, B-Body Performance 1.25" rear bar, Currie rear upper & lower control arms, Dick Miller Racing rear brace, Vogtland springs, "Sport" Bilstein shocks, CIA Cold Air Intake, PCMFORLESS program, S10 torque converter and Performance rebuilt 4L60E w/Art Carr sunshell, HD 1-2 band & Raybestos Z-Pak 3-4 clutches. Harper's HD12 front brake, Techna Fit braided steel brake lines & Stealth Bolt Mod. 12 way front Bonnie seats & rear Bonnie seats.