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Where did your 10 bolt break?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5, Apr 8, 2001.

  1. 90K5

    90K5 1/2 ton status

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    I've been thinking about keeping my 10 bolt instead of a swap to 14SF and just regear it. It is 30 spline, and the stock gov-lock still works. I lost my connection to a 14 SF, and I really dont have much time to look for one and work on it. I was planning to put a powertrax no-slip traction system in it, but for $400, that is really close to the cost of getting the 10 bolt regeared, plus probably $200 for a 14SF. I want to know if it is really likely that my 10 bolt will break? It has 138K on it, does need new brakes, but a 14 will too. I have 33's but drive mostly on the street, and mud once every 2 or 3 months. I'm really not liking 3.42s with 33's and towing a trailer 50 miles a week in traffic. I alreday have a cooler, no one worry. Anyway, what are the 10 bolt's weak spots?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  2. 90K5

    90K5 1/2 ton status

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    BTW.....does anyone know of a good place to get gears done north of Dallas? I really don't care how far away, I'm all over the place anyway, live in Richardson and go to Frisco and McKinney every week to mow lawns....Thanks

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  3. bablazer73

    bablazer73 1/2 ton status

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    I have had a couple of 10 bolts that have lost the pinion bearing. have had a couple lose the spider gears in the gov loc to. I got my new gears from "randy's ring and pinion" good prices. If you are going to use the gov loc over, I would pull it apart and check the shims behind the spider gears. but you should be ok for your 33" with the 10 bolt.

    your right. I don't understand the jeep thing!
     
  4. 87 mid canada k5

    87 mid canada k5 1/2 ton status

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    Just got mine back, the mech. told me that the posi, which I'm pretty sure was a gov-lock, was busted right in half. I kinda figured something was up when it started chirping the rear tires on slow turns back in the fall. But hey it was a great time to get rid of the 3.42's and swap in the 4.10's, otherwise it would have been a tough sell to the wife! I don't even want to say how much it cost though, probably close to writing off my truck!

    Denis
     
  5. Pure Insanity

    Pure Insanity 1/2 ton status

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    i plan to break mine in several places.hopefully itll take a little time so i can recoup from building the blazer.give me a good reason to install the 14 ff.easier to convince the wife too![​IMG]

    PURE INSANITY
    86 blazer silverado 400 horse 350 w/vortec heads 38 x15.5 swampers (40 hawgs next)10 bolts(blah)w/4:88s coming soon,14 bolt.
     
  6. Hathaway

    Hathaway 1/2 ton status

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    Would the warn full floater kit and 30 spline axles eliminate most of the problems? I plan on running 33's on my 10bolts and going up to 3.73 gearing (gotta pretend to get SOME kind of gas mileage). If I did a full floater kit and put a detroit locker in there with 30spline axles would they be beefy enough? I don't rock climb or really go any where insane. But I don't want to be exploding diffs very often.



    Dan, '86 K5, 5.0L v8, NP208, TH700R4, open 10bolts front and rear, 3.43gearing, K&N filter, 31x10.50R15 Trailhandlers
     
  7. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well I'm going from 10b's to the d44 and 12b I have in my garage now... and ya know what... I regrett it! I just have a strange feeling that I'm gonna be swapping them out for a 14 of some type... probably 14sf... but we'll see. At least the gears will be better then 3.08's [​IMG]

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  8. flcpl4fn

    flcpl4fn 1/2 ton status

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    I haven't brokein my 10b yet, but if i ever do then i will put a 14ff in it.

    '85 Jimmy in Jax, Fl
     
  9. lowlevell

    lowlevell 1/2 ton status

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    I couldnt tell where mine broke first&lt;------- But it broke on the highway at 70mph , 150,000 miles. I pulled over and locked the front hubs and limped it home. It sounded like someone was repeatedly hitting my axle with 12 pound sledge hammer. When i opened it up, both the ring and pinion were missing teeth and the spiders were broke. Axles shafts were destroyed from limping it home. I love my new 14ff. :)

    One From None
     
  10. 6.2Blazer

    6.2Blazer 1/2 ton status

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    The stock 10-bolt in my '90 (3.73 gears, Gov-Lock, running 32" tires) pretty much exploded. It looked like something in the Gov-Lock let go first, but it was hard to tell by the time it was pulled apart. When it happened I was away at school and had to rely on the local GM dealership to find out what was wrong. The first two times I took it in they tried to tell me it was exhaust....so I drove it until there was no mistake what it was!!

    Anyway, I had it rebuilt with 4.10 gears, Detroit Tru-Trac, heavy duty 30-spline axles, and all new bearings....and switched to 33" tires. It was my daily driver for about 2 years and has served the last 2 years as a dedicated trail rig (the last year with 35" tires). I have had no problems with this setup, and while we don't have many rocks it does go on all of the tough trails. I've also broken two front axle u-joints in the last year to give you an idea of what it goes through.

    Basically, if you are a sane driver and running 33's, a properly beefed 10-bolt can hold up pretty well. I would definitely recommend a full-case locker like a Detroit.....skip the "drop-in" lockers like the Lock-Right, or any others, due to strength reasons.

    (Shameless sales plug.....)
    I just swapped out the above mentioned 10-bolt for a 14-bolt FF this last weekend, so the 10 is for sale. The reason for the swap is that I'm planning on going to bigger tires and wanted a full locker instead of the limited slip.
     
  11. Blazer1970

    Blazer1970 1/2 ton status

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    One of the carrier bearing cap bolts broke on my Brother's 10 bolt in his 2dr Yukon. I'm sure if he had driven it a while longer that way, it would have led to an explosion where you would not have been able to determine what broke first.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  12. MudFrog

    MudFrog 1/2 ton status

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    Chances are it will break.. My 10 bolt rear, 3.42 gears, no gov-loc and 31's broke on me. I broke 8 teeth off the Ring.

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.coloradok5.com>http://mudfrog.coloradok5.com</A>
     
  13. 90K5

    90K5 1/2 ton status

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    Has anyone had problems with the 30 spline version? The R&P breaking is not really an issue (I hope) If I"m going to regear...

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  14. MudFrog

    MudFrog 1/2 ton status

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    I have the 30 spline version


    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.coloradok5.com>http://mudfrog.coloradok5.com</A>
     
  15. bigblue

    bigblue 1/2 ton status

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    I grenaded my ring gear to pieces. It wasn't fun and not worth regearing. Go with the 14 !

    [​IMG]
     
  16. Emmettology 101

    Emmettology 101 3/4 ton status

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    I only broke one with a Gov-Lok and an axle broke, not the RP/Carrier. I broke the end of the shaft right where it went into the carrier... The rear end of the blazer dropped from about 8-10 feet(almost rolled the blazer).. My friend is about 6'3" and had to reach up to attach a chain to the rear spring hanger to pull me out.....
    This was a 28 spline shaft.

    Mike - <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>[​IMG]
     

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