Rear Driveshaft Length, LWB 4x4 Manual trans

[4inthefloor]

Anyone happen to know right off what the rear driveshaft, center u joint to center u joint length is for a LWB 1/2 ton 4x4 with a 4 speed is?


I've been searching but not coming up with anything on it.

[1967KaiserM715]

Year and transfer case model? And transmission model. Two 4 speeds, one is a 3 with low(SM465), the other is a 3 with overdrive(A833 or like). Three possible transfercases. Np203, NP205, and NP208 (NP241C for 88+ trucks)

I can measure mine tomorrow when it's less wet outside. 1985 GMC K1500, 6.5 diesel with SM465 and NP208, 10 bolt rear end.

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[4inthefloor]

78, sm465 i believe the transfer case is a 208, because it has an aluminum case. it's currently in an 84 short bed, but it has frame issues and i'm going to swap it all over to my 78 frame. my buddies got a mountain of driveshafts and they're mostly old chevy shafts. so going to try and hunt one up in it with the measurements.

[Irish_Alley]

ive tried to gather info about shaft lengths before on here and contacting the company that originally made the shafts for GM when they made our trucks to no avail.

[1967KaiserM715]

Completely forgot this thread, going out now to measure, should at least get you close.

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[1967KaiserM715]

Middle of u-joint to middle of u-joint is 55-1/4" maybe a little longer. This is for a slip yoke drive shaft. My u-joints  are 1350, not stock GM (3R I think) so you probably be fine to go larger.

If you plan on lifting the truck, then definitely try to get longer, while there is no set law, except to measure, I find a 1/4" longer shaft for every inch of lift is pretty close a majority of the time.

Also you need to watch out for u-joint sizes, 1/2 ton is smaller then 3/4 and 1 ton joints.

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[Irish_Alley]

http://forum.73-87chevytrucks.com/smforum/index.php?topic=30344.0

Use this to measure the ujoints