Beefing up a 727 trans!

Weight mostly. The 904 is a lighter duty trans that is about 100 pounds lighter than a 727. I don't feel that it offers any real substantial ET gain in most street/strip cars. Now if you are racing stock or super stock where every hundreth counts than it may be worthwhile. I have the 904 in my car because I swapped from a 4 speed. They both cost about the same when starting from scratch but I was looking to reduce the car's overall weight so that's why I went with it.

My 904 has all stock internals except the kickdown band is Kevlar and the valve body is a Turbo Action tranzbrake unit.