I just got a hold of a 8.5 grand national rear end with a 3:42 eaton posi unit. I was wondering if the difference in performance between the 3:42 and 3:73 were worth the price of a new pinion and ring gear? Just plan on doing some in town type racing with a 350 ci 87 el camino.
Thanks.
3.42 should be plenty fun, and it won't cost you any money. Not to mention that if you don't have overdrive, it will make highway driving that much more bareable...
So long story short, the difference won't be noticible enough to warrant buying a new ring and pinion...
The only place you would notice a difference is on the highway. You would see & hear it rev harder with the 3.73s. Assuming you have a 3 speed transmission. Also if you race the car with both rear ends on the track you should normally find a tenth by going to a 3.73 but you would not likely feel it with ye old butt dyno. If you have a 3 speed stick with the 3.42, and why risk wear & noise problems for a tiny tradeoff.
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