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AXLES - The whole picture

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by K5thatShmobs, Sep 27, 2001.

  1. K5thatShmobs

    K5thatShmobs 1/2 ton status

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    Ok... lately I've been looking around at some options to upgrading axles on my '84 K5, and I was hoping someone out there maybe knew their [censored] when it comes to axles. What FRONT axles has GM ever put in a full size Chevy 4x4? Lug patterns? Gear ratios? Ring gear size? Axle shaft size?

    Here are the ones that I'm aware of:

    - Corporate 10-bolt, 8.5" ring gear, 1.28 axle diameter, 6 lug pattern (Gear ratios?)
    - Corporate 10-bolt, 8.5" ring gear, 8 lug pattern (Axle Diameter? Gear Ratios?)
    - Dana 44, 8.5" ring gear, 1.31 axle diameter, 6 lug pattern (Other lug patterns? Gear Ratios?)
    - Dana 60, 9.75" ring gear, 8 lug pattern, (Gear Ratios?)

    If anyone can add to my list, or can elaborate on what I already have there, it would be much appreciated. As far as rear ends go, did GM ever produce a 14-bolt with a ratio steeper than 4.10:1?

    Thanks Everyone
     
  2. AGM73k5

    AGM73k5 1/2 ton status

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    I'm pretty sure you can get a 4.56 in a k30 14 bolt. There may be others as well :)

    -Aaron

    ___ __ _ _ ____ __
    AGM73k5 -- ajgm1@yahoo.com
     
  3. shaggyk5

    shaggyk5 1/2 ton status

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    you can also find 8 lug front D44's......... (3/4 ton variety)

    --matt
    <font color=blue>86, 350 crate, 33's.</font color=blue>
    <font color=red>Lop Sop Doi Off-Roader</font color=red>
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    You pretty well got it. The 3/4 ton 10 bolt and D44 (yes the D44 was available in 3/4 also) both ran the same shafts as the 1/2 ton. The reason it was rated 3/4 is it got a one ton axle but the front did not really gain any strenght just the 8 lug hubs.
    3.73 was the standard gear in in the 3/4 ton trucks. 4.10 being the option. 4.10 was the standard in 1 tons and 4.56 was the option. In the early 70's some D60 rears made it in the trucks. The 14 is more compairable to the beef of a D70. You just about can't hurt them.
    all ahlf ton 4x4 got the 6 on 5.5 all the 1 tons got the 8 lug. There are 3/4 tons with 6 lug in the late 80's. They had a semi floating 14bolt. Good choice of axle if you have a 10 bolt truck that just blew the rear but it is a C-Clip axle and not quite as stong as the full floating version. Still would be darn tough to break one. Up side is you can retain your 6 lug rims and stuff like drums are a little cheaper. You will however probably pay a little more for a SF14. They are not as common as the full floater and a lot of people have sought them out because of the wheel issue.
    GM ran the D44 front from the late 60's all the way till 77 about. some have found 78;s with them in it and it seems the 3/4 tons did run through 78. The 10 bolts phased in about that time. D44 and 10 bolt are about the same. Heck Dana built the 10 bolt on contract from Dana and everything from the knuckle out is interchangable including the outer axle shaft.
    The 14 started showing up about 73 and runs through current.
    The 12 bolt rear was late 60's till 80 (some 81's have them). In 81 there was a big revision. Dropped the 12 bolt and went to the crummy 10 bolt, front sheet metal changed, 700R4 showed up as did the NP208 case.

    I don't need no damn shop manual, I got a pornographic memory.
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>
    75 Jimmy, Dollar
    Grim-Reaper
     
  5. ken

    ken 1/2 ton status

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    Good response Grim, just a couple corrections...Dana 44s started in 1960. I had a '78 3/4 ton that had a 44 front. 700r4 began in '82, 208 transfers in '81. 12 bolts began in 1963. I also believe the tubes are thicker walled on a 44 over a 10 bolt....but maybe I'm just thinking of the early 44s (with 2.75" outer tube diameter), as they have .5" wall tube. Anyways, not knit-picking, just wanna set everyone straight.

    ken
     

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