Used (normal wear), I have a 4L80E transmission for sale. Works perfectly fine. I bought the truck to use parts from the motor, I have all maintenance records since 1994 and the transmission has never had any issues. I already have a transmission so I won't need this one. Only has 90,000 miles on it. I can even grab all the wiring for you. Comes with transfer case if you want it. Both work ...Appears to fit1971-1980 GM K series full-size trucks w/ NP205 - check thread size. + K30 to 1991 (only model to retain NP205). Classic round engraved 4x4 transfer case shifter knob WARNING: jam nut MUST be used; knob will break if mounted w/o nut! Appears to fit1971-1980 GM K series full-size trucks w/ NP205 - check thread size. + K30 to 1991 (only model to retain NP205). Classic round engraved 4x4 transfer case shifter knob WARNING: jam nut MUST be used; knob will break if mounted w/o nut!

Any GMT400 without AutoTrak takes DEX III or better fluid, although I have read that GM recommended conventional over synthetic fluid in the those T-cases. I have 80k miles with synthetic fluid in my NP243 with a total of 245K and the transfer case is still tight with no play I can see in the output shaft bearings on the rear or front driveshafts.Appears to fit1971-1980 GM K series full-size trucks w/ NP205 - check thread size. + K30 to 1991 (only model to retain NP205). Classic round engraved 4x4 transfer case shifter knob WARNING: jam nut MUST be used; knob will break if mounted w/o nut!