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Old 10-02-2007, 10:28 AM
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Drive Shaft Length

Ok so I'm planning on ordering up an Air ride Technologies kit for my c-10 pick up. The kit I'm looking at can be found here I e-mailed tech help about my question as to weather this will work on a Long Wheel Base truck, the guy said the kit was built on the SWB and will work but I should get a one piece drive shaft made, instead of keeping my two piece with a center support bearing. Now that seems like an awfully long shaft like almost 10 feet I think, Any one else use a kit or lower a long wheel base c-10? just looking for some advise thanks a ton.

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Old 10-02-2007, 06:25 PM
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Quote:
Originally Posted by 71 c-10
Now that seems like an awfully long shaft like almost 10 feet I think, Any one else use a kit or lower a long wheel base c-10?
Ten feet ??

A long bed truck is only 8 feet ... and the rear axle is a couple feet up the under the bed ...

A longer driveshaft would reduce the amount of angle on the U joints ... and 8 foot is doable ... but there are laws about the length of driveshafts ... Federal ... I just do not remember how long the limit is ...

Looks like TON of $$$ to me ...
I have lowered trucks before ... ( springs, shocks, spindles and flip kits ) and had to correct the driveshaft length. Never had a UP/DOWN air setup.
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Old 10-02-2007, 09:09 PM
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thanks for the reply deuce your right it would be at most 8ft but i guess a little shorter since the trans pretty much ends at the bed. I know it's a lot of money but I like the adjustably of the air ride and my buddy has it on his 63 Biscayne its real nice. Iv been saying I'm going to lower this thing for the past 3 years and have talked about springs spindles sectioning control arms the whole nine yards. So who knows what i'll do. But i guess if i go with this air ride and a one piece drive shaft I would have to take a measurement at maximum height and minimum and see what kind of difference if any I have to make sure i don't get the yoke pounding into the back of the trans right? I don't see why I can use my two piece and just drill two holes in the new cross member and make it work, or get some sort of two piece with a slip shaft like 4x4's have... hmmmm I guess i wont know tell I order something! haha but thinks for the input again
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Old 10-03-2007, 04:10 AM
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I seem to recall years ago in car magazines, that 59" was the max due to balancing issues.
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Old 10-06-2007, 08:18 PM
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Some of those long bed trucks had one piece drive shafts, but it's been a while since I messed with them.Some GMCs had leaf springs vice the coils and seems as though the leaf sprung rears had one piece drive shafts. Maybe some of you younger guys with better memories can add to this.

Trees
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Old 10-07-2007, 09:32 PM
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hmmm i'll have to do some research on that. Mine is a chevy with coil springs. I guess GM did all kinds of weird things with these trucks because my buddy had identical truck that he wrecked so I took the trans but his was a long tail shaft and mine is a short.
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Old 10-08-2007, 12:03 AM
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The one piece drive shaft wouldn't be anywhere close to 10 ft It would be just a bit over 6 ft. Without going out and crawling under my 71 with a tape measure
I can't give an exact measurement.

The reason the air lift vendor suggested the one piece drive shaft is to keep the drive angle from changing as much as it would with the shorter back half. When you increase the angle you increase the wear in the joint

Actually the driveshaft is going to stay on the same plane as the rear control arms and pivot from the same place. I would run it as is and if I had excessive wear in the front U joint I would have a good driveshaft shop install a constant velocity joint that will take a bit more angle without eating up ujoints. Or switch to a one piece drive shaft at that time.
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Old 10-25-2007, 01:53 AM
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The rule-of-thumb I heard was 6 feet. I have a shaft from a '84 Chevy LWB half-ton that measures ~71" center-to-center, and it was working fine until a welding truck pulled out in front of it.
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