The internal transmission parts are the same for the OD and non OD trans. If the price is right get both. You can usually buy the SM318 transmissions pretty cheap but if you have to buy individual parts some can be quite pricy.
Fred

Last edited by rfs56trk; 05/07/2012 3:36 PM.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine