I think you'll be ok with a decent rebuild of the T5, as long as you're not doing drag launches.

Your 8" will also hold up just fine to what you seem to be planning on. A good limited slip diff and proper gearing would do you fine. I'd consider selling the 9" to fund some of the other parts of the project. '67-68 Mustang 9" rears aren't easy to come by and can fetch decent money.

 

Starfury, what is your idea of a decent rebuild? Just a stock rebuild or something a little beefier? I was looking into swapping to a 2.95 first gear and found out that my local shop wanted to charge me 1200 bucks. As far as the rear end is concerned, I know that the 8" is pretty solid, kid brother to the 9" if you will, but I think that I will end up keeping it just because of the cool factor.

 

If you're going to be abusing it on the track or doing burnouts/drag launches with sticky tires, something along the lines of an AstroPerformance rebuild might be in order. Pricey, but the only way to keep it from grenading at that point. Otherwise, a stock rebuild would be fine. Gears are expensive, hence the added cost over a traditional rebuild.

 

The car won't be going on the track at all. Its going to be a driver car not really a performance vehicle. As far as the burnouts and launches I am sure they will happen but not regularly. I will look into the astro kit you mentioned. Thanks for the advice.

 

T-5's are easy to rebuild if you have good basic skills and tools. Why not give it a try yourself, it's very rewarding........

 

Thanks for the encouragement Tex I plan on doing just that. I don't know if I should just do stock rebuild or beef it up some. Any suggestions for doing just that?

 

Replace the term "beefing up" with "futureproofing." If you decide to stick nice heads/intake/cam on that motor of yours, it's nice to know that you won't have to touch or worry about the tranny if you upgrade it now. Your 8 inch rear should hold up to 450 HP or so, that's what I've been told.

Someone feel free to correct me on this, but the difference between 8.8 and 9 inch rears is 4 teeth being in constant contact between the ring and pinion, as compared to 3 teeth with the 8.8. The result is being able to handle more HP/torque just because there's more physical metal touching. The 8.8 rear is not a piece of junk! I was always told 9 inch or nothing from all the half-tarded morons in my area. Just do some research. On the same hand, 9 inch rears are not wastes of money themselves. You never know what will turn into a project, and having that 9 inch laying around will probably be worth more than selling it, in my opinion.