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Old April 21st, 2010, 10:54 PM   #1
Lousypirate
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Exclamation Rear driveshaft

I have a 77 Chevy 3/4 ton with a 4" lift that i bought in November last year.

I tore the tranny/tcase out a few weeks ago, and discovered the aluminum slip yoke housing was broke off (all but one bolt). so i called up a buddy and he gave me the parts to swap it out to the ford gears to get it to a fixed yoke.

Now i have the problem with the driveshaft for the rear, he gave me 5 to mess with (2 rear, 2 front, one for divorced) the fronts are too short as well as the divorced, and one rear is too long but looks like it is for a 3/4 ton and the other is pretty close, close to the fully compressed side installed except for about 3/4 of an inch, except this is for a half ton (about an inch smaller in diameter).

will this driveshaft work for both driving down the road as well as wheeling, or am i going to turn this into a pretzel?

I'm in flint right now so i'm thinking about just digging around the junkyard to try to find a driveshaft that is beefier and potentially the right length. All of the ones i recieved are pretty rusty. Is it worth it to have someone shorten this since i can't drive back home to use the welding shop for a while. Or do i make the 1/2 ton work for now and still go get another one and just hope it lasts ( I intend on doing some light wheeling in may) and get the 3/4 ton or 1 ton axle to what i'm looking for and shorten it myself... Has anybody done this before???????? i'm very hesitant to just throw that puny looking axle in the rear

(ps: i have corporate 14 rear, 10 bolt front, 4:10 gears and 35" tires) NP205 obviously and th350 behind 400 sbc)

Thanks Guys! i haven't been on here in a long time since i haven't had a truck for 2 years
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Old April 22nd, 2010, 11:10 AM   #2
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i'd get rid of the slip yoke first, there nothing but trouble!
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Old April 22nd, 2010, 07:54 PM   #3
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The slip yoke is gone, replaced with fixed yoke from a Ford.

That's why a new driveshaft is needed.

I guess the main question is how expensive/difficult is it to shorten a driveshaft?
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Old April 22nd, 2010, 08:33 PM   #4
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Quote:
Originally Posted by redhead_823 View Post
The slip yoke is gone, replaced with fixed yoke from a Ford.

That's why a new driveshaft is needed.

I guess the main question is how expensive/difficult is it to shorten a driveshaft?

Very easy to shorten one up. The yoke on each end goes into the tube about a half inch. Just cut it off close to the end and cut to length and reweld it back on nice and straight. I've done it for a lot of boggers and one DD. For the DD there was a little vibration so a balance may be in order.
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Old April 22nd, 2010, 11:17 PM   #5
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shortening isn't so much the problem... i was hoping someone did this and found out a driveshaft out of something stock worked just fine. I can find one that is too long without an issue and get the driveshaft back home where i can shorten it in the family welding shop.
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Old May 1st, 2010, 07:40 PM   #6
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i had kind of the same problem try a 70's 2 wheel drive thats what i ended up using
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