Posted 14 April 2011 - 07:16 AM
Your best OD trans would be the 200-4r, as it is the same length as the TH350 which means you keep the same driveshaft, and bolts directly to the BOP engines without an adapter.
Don't over look the strength either, (Search "Art Karr") as its the same transmission used in the Buick Grand Nationals, Monte SS, and 1989 Turbo Trans Am, and are being used behind 500+ HP Pontiac strokers.
The only major mod is that the cross member needs to slide back to fit the new position.
This trans offers more frictions disc than the 700r4, which means better lock up at shift points, and has a lower first gear ratio which will aid in taking off from a dead stop.
I work for a GM dealer and the transmission guy is a personal friend of mine and he's building one of these for his 403 T/A and will be running a 3:73 rear...this is the same set-up I have planned for my 79 as well.
1979 Pontiac Firebird Trans Am
1983 Pontiac Firebird Trans Am