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Old 05-27-2021, 08:43 PM   #18
kipps
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Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
Re: 14 bolt conversion to disc questions/options

I agree with Hatzie. You likely don't want the massive 11.5" 14-bolt that came behind the 8.1 and 6.6 diesel engines. The 10.5" is the one you want, and it was found in the 6.0 trucks.

Some of the early-2000's 10.5" 14-bolts came in 3.73 gears. You might get lucky and find one. Most were 4.10's though.

If you're running a conventional slip-yoke transmission or transfer case, grab the driveshaft to go with that rear axle. It will likely be too long, but it's cheap enough to shorten it. That way, you won't have to swap out the pinion yoke on the rear axle or run a conversion u-joint. From my experiments, all the slip yokes from the 1980's through the 2010's were identical. The early 2000's 2500hd trucks with a 10.5" 14-bolt have a 1410 u-joint.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!
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