Well I am sure that my trans will not hold up thru the year. I got this spur of the moment idea, If I were to get a pc out of a 3/4 ton 454 with 4l80e trans and put in my 1/2 ton 350 4l60e truck(after i put in the 80e of course) would it work or would I have to swap out the harness to? I looked at the 454 factory tune and I am pretty sure that I can swap over the 350 tune to it. Anyone see any problems with this. I figure that if I can keep it looking stock and tune everything with the same program it would be simple, rather then tunning with multiple programs. thanks

 

I put a 4l80e in my 98 RCSB. The swap only involved 5 wires on 3 of the connectors at the PCM, 2 of which will go to the front speed sensor of the 80. The 60e has 5 solenoids and 1 speed sensor (rear) and the 80e has 3 solenoids and 2 speed sensors. 98 and 99 OBS wiring SHOULD be the same. P.M. me if you want the wiring change info.