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#18 | |
Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: 78 blazer rearend not the same..
Quote:
The pinion in the truck 12 bolts are only 1.438 compared to the passenger car 12 bolts of 1.625. Ironically the truck 10 bolts in later years which are the 8.5's (ring gear diameter) have the same diameter pinion as the passenger car 12 bolts (1.625) So they have an advantage over the truck 12 bolts in that respect. But even with all that said, I kept the truck 12 bolt for a few reasons. I didn't want to go through the trouble of searching for a 14 bolt or dana 60. They are heavier and take more HP to turn them and I'm a concious person about that stuff (just comes from a racing back round) Plus these brand new front and rear diffs just kind of fell into my lap, I wasn't looking for them. I was actually quite happy with the 3.07 gears that were in the blazer. But with all the new parts, ball joints and tie rods, new ring and pinions, posi, etc....there was easily 3-4 times the money in them than the $500 I paid. I was looking to buy a new posi for my original rearend and also planning to replace all the tie rods and ball joints in the front end (they are all original) in the next couple of months. These front and rear diffs solved both of those issues in one shot. Another little benefit I gained was larger rear brakes 11x2 3/4 vs 11x2 with all new brake hardware and wheel cylinders, new rotors and new drums, brake hoses etc. etc...The guy stuck alot of money in these diffs and they just sat. I don't do any hardcore off roading, just recreational. Only run 33's on it. I'm more worried about snapping another pinion in half on the street ![]() ![]() It wasn't hard work though, I did the spring perches and the shock mounts in about 2 hours. Had the rearend in the truck and driving it that evening. The front diff will be a direct drop in. |
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