Re: Figure out gears
Most that I saw on the 14SF in the square bodies were all 8 lug. I obviously wanted 6 lug so I didn't need to change wheels, so it can be done.
I went to a junkyard and found a 8 lug, 14SF from a suburban with 4.10 gears. Took the backing plate off as well as the axle shafts.
Then I found a later model 6 lug, 14SF from a pickup and used those axle shafts, backing plates, brakes and drums. Mounted to the suburban axle and bought the whole thing from junkyard as a complete assembly. I then had a 1/2" spacer plate made and put between axle mount and backing plate to account for the (very slightly) longer axle shafts.
Then everything bolted up directly and I've been running it for years.
I even took the front axle from the suburban (with 4.10 gears), and removed all the way to the ball joints, and took my 1/2 ton shafts, spindle, brakes and calipers....all bolted right up and back to 6 lug.
To determine the ratio you have, pull the cover and there should be markings on the ring. There will be some numbers stamped on it so you can tell what gears you have.
3.08 gears - "40:13"
3.42 gears - "41:12"
3.73 gears - "41:11"
4.10 gears - "41:10"
4.11 gears - "37:9"
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires 
04' GMC Yukon XL, 3/4 ton, 8.1L
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