gomer

iTrader: (13)

My "racecar" is a 91 mustang coupe and it has a new Performance Automatic transmission with a trans brake and custom stall in it. The car has a full suspension, cage, fuel system, and everything else. I'm thinking about when I pull the engine to freshen it, to replace it with an LS1.. BUT, I want to maintain my current C4 transmission. Does anyone know if there is an "adapter" that will allow this?
Thanks

crainholio

iTrader: (2)

The only company I know that makes adapter bellhousings for the LS1 is McLeod. Give them a call and see if they have a Ford C4 trans setup yet...but be prepared for a "no" answer as this is a pretty unique requirement.

z98

Isn't the LS1 only one bolt away from the SBC pattern?

SPANKY LS1

iTrader: (24)

Try calling JW Performance transmissions. They make a ton of "Ultra Bells" that adapt odd engine/trans combos, maybe they have/can make one. My buddy runs one in his SBF/Powerglide combo.

jeromio

You'd be money and pain ahead just selling your C4 and buying a well built 4L60e, 4L80e, TH400, TH350.

Brains

iTrader: (7)

There's always the option of making one yourself. When you build an LS1, use the 6.0 truck crank (longer style, intended for the 4L80E). This will set the flexplate back a half inch or so, allowing you to easily build a sandwich adapter for the bellhousing. Then drill the flexplate to match your C4 converter bolt pattern.

z98

My vote is for the TH350 too

Built wrong made right, might as well go all the way!