Quote:
Originally Posted by 72GREENC10
Finally got my trutrac. Gearing is the next obstacle, I'll be running a 400hp sbc with a 700r4 on a 18" wheel with a 40 series tire of anyone has recommendations. I decided to pull the old 350/th350 this weekend and to start degreasing and undercoating the frame and under the body. The rear end is going off to get the ring and pinion installed soon. I will more than likely be running the stock axles seeing that I won't be making any crazy hp. I also got my shock brackets for the front from cpp.
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I have ~380 hp SBC with a 700R4 in my '71 stepside. I have 3.73 gears in the rear end w/ ~27" tire. With the tall 1st of the 700R4, you probably don't want too steep of a rear gear. With the 3.73, I'm out of first ~15-20 mph under normal acceleration. Under full throttle, you'll probably be out of 1st by ~35-40 mph depending on how high you let the motor rev. I'm toying around changing the rear end out, and I would still stay with ~3.70 gear. There are some shops that will put a shorter 1st gear in the 700R4 to get the 1-2 shift closer together. Good luck with it all. I'm jealous of the tru-trac. Curious how it goes in with the C-clips (I'm assuming you still have the c-clip axles).