Go5.3tt06

iTrader: (1)

Since I have a good transmission from 2006 Silverado 2 wd. I kept in garage. Now I got 2003 gmc sierra truck 4x4 5.3 the transmission sometimes jerk little harsh shift from first to second gear. Maybe because of high miles. Its 271,000 on it. I wonder if I can use 2006 one that is 2wd but can use my 03 gmc 4x4 adapter that can mount with the transfer case. It will work fit ok?

1FastBrick

iTrader: (17)

No, the output shaft is a different length.

Whole transmission guts need to be removed to change the shaft.

Go5.3tt06

iTrader: (1)

Really dang why sometimes shift 1-2 gear firm? Maybe need tunes? Servo?

1FastBrick

iTrader: (17)

It could be anything.

A broken spring, a worn valve body plate with a sticking check valve, A sticky valve in the valve body... Its also possible someone put a tune on it with high line pressure or something.