Just want your opinion if you were in my shoes:

1999 Silverado has a busted tranny.

2004 GMC tranny shifts fine but has 112K on it (My DD)

Being loaned money to get a tranny for the 99. BUT do i just put the ''new'' tranny in the 04 and put the 04's in the 99?

The 04 does have a aftermarket warranty that may cover the stock tranny if it goes.

So do I bother with the dual swap or just put the new one in the 99? I was looking at the Goodfellas tranny that is good up to 400 HP.