i took a ride in my buddy's bull nose 351w yesterday, after he put a street fighter c6 trans in it. and the difference from being a standard then going to a built automatic was quite impressive. so now while my motor is is pieces i'm thinking about replacing my old 4 speed with an automatic. i was thinking something along the lines of a super street fighter c6. what i was wondering is what rear end gears do i need to be able to do smokey burnouts and still hit 100 mph pretty quick. my 4 speed will burn em off in every gear and wrap the speedo extremely quick and ask for another gear. its registered for 100 and i can bring it up to about twenty before i get back out of it due to it screaming at me. i have a 74 highboy 428 fe (mildly built) with 4.10 rear end gears, 33 inch tires. so what do you guys think would be a good gear choice? i don't care about gas mileage what so ever. it runs on 116 race gas. the truck is just to remind my friends that there's no replacement for displacement, and to have a good time in.

oops almost forgot i will not run my motor past 5500rpms. my dad and brother do it, and say its okay. but its not theres to fix when it decides to come apart.

 

That's a tough call. 4th on the 435NP is of course, 1:1. On a C6, without a lockup converter, it's not going to be 1:1 but pretty darn close.

A quick run with the calculator says 2000RPM is 47.8 MPH. So at 5500RPM, you're running 131MPH. With a torque converter and a C6, it won't be exactly that, but close.

Is that fast enough?

 

sounds good to me now lets see how fast i can get there.