Originally Posted by laboitenoire
Are you replacing the tranny? Or just the differential? I would go for a gearing that allows you to cruise in a low gear so you can save a bit on gas.
Just the differential. The transmission and engine are basically new or completely rebuilt... The differential is the old stocker 8.2 inch ring gear - 10 bolt. You can hardly find parts for them anymore. GM stopped building those rearends back in 1969 or so. They went with a "Corporate axle" in 1971. It's a 10 bolt, but came on many cars and trucks up through 1991. So parts and gears are available... Even disk brake kits to replace the drums, which I want to do.
As for the gears. The current gear set is 2.76. They are great for cruising the highway, but lack a little for "performance". I'm looking at the 3.08 gear set from Eaton or Auburn, along with a posi unit to replace the old open end carrier. If I could find some 2.93 gears I think I would be set, but no body sells those, per se. The difference is about 300-400 rpm at 75mph. The 2.93 would be about 2,600 rpms and the 3.08's would be about 2,900 rpm....with the tire combination I currently have - 275/60-15's. These tires are about 28 inches tall... so the math figures about right.
I still looking on eBay and calling around. Maybe I can find a good used set of gears as well and save myself some money?? I have another Conroe coming soon, and I don't want to short myself. Within the next two weeks I'll try my hand at another GPU folding rig...
It'll have an AMD64 3800+ mounted on an ASUS A8V-VM board and the X1950XTX I have. DDR will be Crucial Billistix... I also have an old 550W power supply and 80GB WD hard drive. I just need a case. The local computer shop will keep their eyes open for an old one coming in. My wife's office just updated a couple of computer from PII 450's (do you believe that!), so I might be able to snag one of those... Those old PII's were running Windows 98SE! Man they are old!!!
Well that's plan thus far. Take care and thanks for the interest, :-)