im building a 347. i work at an engine shop and we built a 331 a few months ago that dynoed at 427hp. so with my 347, it should push out about 440-450hp. i know there have been numerous threads about what size rear ends, but i dont want to go searching through them for my answer. so, my question is, can i rebuild my 8 inch rear end to withstand my motor? i want a 9 inch but i dont have the money. i dont have a clue about gearing and whatnot, so can someone please explain what the gearing ratio means, like 4:10, 3:73, etc. and can someone please advise me on what would be best for me. i plan on putting a 5 spd manual, and i rarely drive it on the freeway. so should i get a more torque-ier set up? i really dont know at all about gears and stuff so bear with me. thanks very much

 

As long as she is hot, I say go for it!

 

I think about rear ends all the time.


About your question, though: You can easily build an 8" to take that kind of power. You'll want to swap the axles and brace the housing to reduce flex. A rebuilt center chunk also helps, just make sure the carrier is one of the stronger pieces (count the ribs...more the better).

The axle may last a while without much for upgrades as long as you drive smooth. The 8" is used is racing quite a bit, usually on the small time dirt tracks and some paved tracks. They are lighter than the 9" and can handle the smooth action of oval racing pretty well.

 

Don't be so lazy. There has been numerous threads in the last couple of weeks, and I aslo think theres something in the FAQ section. No spoon feeding allowed.