Ulf,

My 1956 Tow Truck has a 350 sbc against the original SM420 4-speed and it does great! I can run 65+ mph all day long. If you're having trouble shifting your synschronizers may be shot, might be time for a trans rebuild, which is way easier that re-engineering EVERYTHING...

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD