You can get 3.07-3.33 gears from Dana 60s in later vans. I've never
heard of 3.85-1s in any year 60, btw. What is the tooth count?
I suggest that you join the Yahoo groups, blowthruturbo, draw-thru
and junkyardturbo [jyturbo]. Study [scan all the messages from #1,
at each of those groups]. That'll give you an idea of what you'd be
getting into. You would need very high quality exhaust valves, and
perhaps even seats for heavy towing. Under extended heavy loads,
those components will see extreme heat under boost.
" <legayerabydavis56@y...> wrote:
> im putting in a 68 472 caddy in my 71 f250 stepside i want to put
> twin turbos on the 472 i do a lot of heavy towing and hauling also
> cant get the right gears for my truck it has 3.85 gears i dont want
> to blow up the 472 ive been told that i need 2.73s to 3.55s.the
> end in my truck is a dana 60 with tracklok posi .i dont think the
> caddy rear end is strong enough to do what i do i could be
> anybody can help .thank you