Morning,
I'm new to this, if I'm in the wrong place please send me in correct way Thank You.. My question is ' can I swap engine and transmission from a 1999 Chevy Suburban 5.7L V8 c1500 into my 1991 Chevy Silverado c1500 5.7L V8 . My 1991 engine looks lot less then the 1999. the air filter on 1999 is not like my 1991 filter round with butterfly nut. And for the transmission when I bought my 1991 Chevy from auction it showed 420,××× miles on it hahaha . But it looked like the owner had replaced parts. The 1999 Suburban has 160,xxx miles and gears change on time (good). . My Silverado runs very good it been driven to California , Vegas , Utah , Arizona from Arizona. It does have a small oil leak looks like tranny just haven t really checked it out. I apprecIate all the help I get .

 

Probably can do, but your 1991 Chevy has OBD I, so you will have to find a compatible OBD II ECM for this to work.