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#49449 08/24/2005 4:43 AM | Joined: Jul 2005 Posts: 27 Junior Member | | Junior Member Joined: Jul 2005 Posts: 27 | Hi, I am thinking of putting a different rear end in my 66 GMC. I just put a 283 and a turbo 400 tranny in it and I had the drive line shortened. Now I need to know if theres a better rearend to match transmission. It's a 3/4 ton and used to have a 305 v6. Thanks for any input. Jeffrey
I'm older than my truck but it's smarter than me! 66 GMC 3/4 ton fleetside 283, turbo 400.
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#49450 08/24/2005 7:41 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | Search the posts in this forum for info about selecting the right rear axel gearing and figuring out the width of the axel you'll need(from tire mount to tire mount).
Basically, you've got to figure out what bolt pattern you need, know the gear ratios in your tranny and then do some math/calculations using an online calculator to arrive at the gearing that'll work for your needs. Then measure the rear axel and tire rim backspacing to get the width axel, then go looking in the junk yards for one that'll work. Finally, you'll have to cut/grind the leaf spring/coil spring mounts, get a set of spring perches (about $12 for the set), figure out where to put them on the axel and have them welded in.
Don't forget that swapping the rear end means getting at least a new u-joint for your driveshaft to match the pinion on the new axel.
Finally, another option would be for you to change the ring and pinion gears in your existing axel. It is sort of a pain in the @$$ but not too expensive to have someone else do for you if you take them your axel and the new gears. Depending on the diameter of the ring gear in your axel you might be able to get new gears for about $150 and have them set up for about $250.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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#49451 08/25/2005 6:13 AM | Joined: Aug 2004 Posts: 90 Member | | Member Joined: Aug 2004 Posts: 90 | google up
smokemup and plug in your specs. and hit the calculate button
gooday
jim
Gooday
Jim
small wheel moves by fire and rod,
big wheel fires by the grace of god,
everytime that wheel turns round,
bound to cover just a little more ground.
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