Simple way to know.
All 6 speeds with the large input have a spacer between the starter and the block plate.
If the door tag date is 8-2000 and later it's a 2001.
Does the rear axle have disc brakes?
Mark.
this has a spacer so by that it would be large,
I would have to have to get a decent price for just trans, offer?
or buy whole truck for 5500$ runs and drives great, bought it to help customers and they all backed out