[rosconz]

I got a slim jim(free) from a guy in Wellington as a spare for my 63 Cat, he fitted a TH400 to his 63 using the original cross member and NO hammering on the tunnel. You'll need an adapter plate to mount the starter if you use the original engine.

[pfilean]

I put a 350 in my 61. Needed an adapter because of the starter problem and also my 350 was a Chevy bolt pattern. There are two nice adapters I know of maybe more. Although delivery maybe a problem as this is not a high demand piece and maybe not waiting on the shelf. It needed minimal hammering. For a 400 and no hammering I would want to look close at the resulting U-joint angle and maybe the clearance between the U-joint and the cross member. The 400 may require lowering the transmission and make the carb out of level and change the float setting. Maybe a change to fuel injection solves that. Not to mention distributor to fire wall clearance. There are a number of stories on this site about transmission swapping. Do some searches about replacing Old Jim and see what you think. I didn't want to change from a stock transmission but I really like the 350.

[Keith Seymore]

Originally Posted by rosconz

I got a slim jim(free) from a guy in Wellington as a spare for my 63 Cat, he fitted a TH400 to his 63 using the original cross member and NO hammering on the tunnel. You'll need an adapter plate to mount the starter if you use the original engine.

Agree.

I put a TH400 in my 63 GP and it's a tight fit. A TH350 should be no problem.

Also agree - a starter mount plate will be required if using a 63 engine, even with a BOP trans.

K