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Old 03-20-2006, 09:30 PM
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carrier bearing

hello, havent posted in a while.
got a 71 chevy truck that im working on. im replacing the original truck 4 speed (muncie 460) with another 4 spd(m20). i managed to scab all the mounts and crossmembers, and drive shaft. the driveshaft looked a little short in the truck i pulled it out of. all the chevy trucks that ive seen of these years all have the carrier bearings, and i was wondering if i could just replace the two piece with a one piece? or does the driveshaft need to be two piece because of the suspension style?
thanks
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Old 03-21-2006, 12:09 AM
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It sounds like you have a long bed. If you do you can have a custom driveshaft made but it the tolerances for the pinion angle will be very tight so it has to be set up almost perfect. Longbeds had carrier bearings and a 2 piece driveshaft and the setup was not all that bad. Most of the carrier bearings last a long time if they are set up correctly.
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Old 03-21-2006, 08:34 AM
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There are actually legal requirements for the max length of a driveshaft! Strange but true. Found it out when I tried to get a one piece for my 77 long bed. The shop would not do it, had to stay with the 2 piece and carrier bearing. Like was said above, the carrier bearing usually outlasts the truck!

Mark
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Old 03-21-2006, 02:52 PM
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thanks guys i appreciate the help
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Old 03-21-2006, 05:40 PM
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I found that almost NO driveshaft shop would make one for me over a certain length, mainly because they didn't have means for material in the length I needed.

I found that a couple would make a carbon-fiber driveshaft in my required length but it would have cost me $1300, for a $800 truck.

A local driveshaft guy would make one in ANY length, and did for $200, and he would guarantee it too.

I've never seen or heard of any legal statements on driveshafts at all as of yet.
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Old 03-21-2006, 11:23 PM
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Some long-bed Chevy pickups came with one-piece shafts, so it's do-able. I have one from an '84 Chevy and it's around 71" long from center to center, and is larger in diameter except at the end. A '71 would probably need one several inches longer than that, due to the shorter rear end and transmission tailshaft.
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