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Axels

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by 69K5, Dec 4, 2001.

  1. 69K5

    69K5 1/2 ton status

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    I'm thinkin about an axel swap down the line for my 69, and decided to start on the homework part. I have a 69 K5 (stock) with a 307. My friend who is pretty knowledgeable says that my axels are a dana 44 (front), and a chevy 10 bolt in the rear. I couldnt tell you the difference if I had too. I am building a .350 for it that will have a lot of torque when I'm done. I live in louisiana and will not be doing any rockclimbing just mud slinging. I plan to never run more than 35's with 4 -6 inches of lift.. Do I even need to swap axels? My aforementioned friend said that he would only swap the rear out to a 12 or 14 bolt. Also how do I find out what gears I have now? What do ya'll think? Thanks in advance again.
    69K5 (nathan)
     
  2. ImpalaSS

    ImpalaSS 1/2 ton status

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    if its stock it should have a 12 bolt in back and a dana 44 front with drum brakes, a 14 bolt FF and a 8 lug dana 44 would be a nice swap, to check gears look on the bolts holding your gear covers on for a tag.... take the tag off clean it up there should be a number like 41:11 divide the two togther and you got your ratio

    68 SWB 4x4 1 of 1,449 made 327, 465 4 speed, rockwell tcase, dana44, 14 FF, <a target="_blank" href=http://communities.msn.com/68K10>http://communities.msn.com/68K10</a>
     
  3. 69K5

    69K5 1/2 ton status

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    It has drum brakes front and rear. I'll have to check and see how many bolts are on th rear. What does the FF on the 14 bolt stand for. If I do that swap like you said could I also swap to Disc brakes on the front? Thats on the to do list also. It's just really really expensive. Thanks again for the help.
    nathan
     
  4. SlyDog

    SlyDog 1/2 ton status

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    FF = Full Floater SF = Semi floater .... Count the bolts, a 12 bolt has 12 bolts [​IMG]

    <font color=green>[​IMG]1977 K5 GETTIN IT AWN[​IMG]</font color=green>
    BUILT NOT BOUGHT
     
  5. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Nathan,

    My guess is that with 35's...your weak link will be the 10-Bolt out back... If you can find a 14BFF, that's generally considered to be the LAST axle you'll ever buy for the rear. (That's 14 bolts around the perimeter of the diff cover, and Full Floating Axle...Look for a "hub" sticking out from the center of the wheel)

    The bummer is that it's an 8-Lug wheel, so your existing wheels won't work. Some guys go with the 14Bolt SF to stay with a 6-Lug wheel, but they are harder to find, and if you break an axle....what's left of the axle and the wheel will fall right off your truck!!!!

    It's not as "sexy" as a 14-Bolt....but going to a GM12 Bolt would allow you to use your existing wheels, and it would be stronger than what you have now.....best advice is probably to just have fun with what you have and start saving your money. Once you finally destroy that 10-Bolt (and you will eventually!) you can make a decision about how to replace it.....

    The 1-Ton Axles (14BFF Rear &amp; Dana 60 Front) is what almost everyone on this list covets for themselves!!! There are plenty of people here having LOTS of fun with their trucks in the meantime as they save and dream of that "ultimate upgrade".....

    I'd say keep reading and studying this list.....you've got time, and it will make more sense as time goes on....I promise!! [​IMG]

    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  6. Triaged

    Triaged 1/2 ton status

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    As was said before you should have a 12bolt in the rear and a D44 up front. You can get the disc brake stuff for cheep because alot of people are converting to 8 lug and removing all the old 6 lug stuff. When you do that you will want to upgrade the front axleshafts (old ones have small weak u-joints). Spicer just started making a u-joint that is 20% stronger than the old (73-) style. It is a #5-760x. For the rear it should last fine (if it is a 12 bolt) w/ 35's in mud but I would at least put in some aftermarket axleshafts (and maybe disc brakes too).

    I think I might be one of those guys that could break anything (I sure do try my best). But most people don't have problems with well maintained D44's and 12 bolts.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  7. ImpalaSS

    ImpalaSS 1/2 ton status

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    yes you can go to disks, you will also need new brake lines, master cylinder for a 71-72 truck proptioning valve and other small stuff.... im in the process of this swap

    68 SWB 4x4 1 of 1,449 made 327, 465 4 speed, rockwell tcase, dana44, 14 FF, <a target="_blank" href=http://communities.msn.com/68K10>http://communities.msn.com/68K10</a>
     
  8. Steve_Chin

    Steve_Chin 1/2 ton status

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    Might as well get rid of the drum brakes out in back too...

    I hate drum brakes!
     
  9. POFF

    POFF 1/2 ton status

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    Check with Warn and some of the other 4x4 manufacturers, they may make a full-floater kit for the 12 bolt. It still wouldn't be a 14 bolt but it would be a lot better than the standard 12 bolt.

    Never said I could spell!
    '70 K-20 San Diego, CA
     

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