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Gearing/axle shaft questions

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by Thrashed68, Aug 14, 2001.

  1. Thrashed68

    Thrashed68 Registered Member

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    I just bought a 12 bolt with a Detroit C locker and a front 10 bolt with a lock rite. Both have 4:56 gears. Will this be to much gear for 33 inch tires? Also, the front axle shaft has wallowed out u-joint hole due to a bad joint, Will a D44 shaft swap in directly or due I have to find one from a 10 bolt? And just how weak are these 10 bolts? I am not really into rock crawling or 10 foot deep mud pits, just want good traction for whatever I may incounter. Any opinions are welcome. By the way I only paid 400$ for the axles and they have about 1000 miles on them. Good deal?

    Skin grows back, Parts cost money!
     
  2. Triaged

    Triaged 1/2 ton status

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    4.56 is alot of gear for 33's without a OD! Why don't you make it easer on yourself and run 35's. BTW 3.73 is seams about right for 33's

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
     
  3. Triaged

    Triaged 1/2 ton status

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    10 Bolt Axle shafts will not fit in your D44. They have 28splines and not 30 like the D44.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
     
  4. Steve_Chin

    Steve_Chin 1/2 ton status

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    The GM corporate 8.5" 10-bolt differential is pretty strong. It's as strong as the Dana 44 and has a stronger pinion shaft, so I wouldn't worry about it as being weaker than a 44. I'm not sure if the axle shafts are stronger or weaker on a front axle, though.
     
  5. POFF

    POFF 1/2 ton status

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    The 10 bolt shafts are the same size as the Dana's (not the same shaft but same size). I have 4:10s with 33's I wish I had 4:56 with my 2:1 205 t-case When I'm wheeling. BUT, I can really only cruise around 60-65 on the highway. 3:73 would be a little high off road.

    '70 K-20 San Diego, CA
     

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