Hello,.to all,...i have a 78 dodge truck master cylinder with the small BRAKE BOOSTER,...im looking to drop the ### 12 pound master cylinder,...for a aluminum master cylinder,...i have seen other truck ,..but don't have any cross-over numbers to do this,....thanks for any info on this,...if anyone would know you guys are the best !....thanks Frank

I can't give you a part number but my 93 RC has an aluminum master on it.

Does your 78 master cylinder have 4 bolts or 2 bolts holding it onto the booster?

2 bolts are most Dodge trucks from about 80 up to the 94 model year.
4 bolts will probably requires a switch to something like an early 80s 5th Ave to get an aluminum master. Gene

It has only two bolts....it has been a real job @#$%^&* ....to find the right one !!

My '82 did as well. RAYBESTOS MC39178 is listed to fit 1979 to 1993.

Robert

You may have to change or adapt the fittings but it should bolt up to the booster. Just make sure the pushrod depth is the same.

Go to Mancini racing, they have what your looking for and the adaptor to go to a 2 bolt master.

My master cylinder is a two bolt,..i have a four bolt one with a big brake booster,....trying to stay with the small brake booster with a 440 under the hood,...