Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

10 bolt fronts were not used til what year ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by R72K5, Oct 4, 2002.

  1. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    got a friend who says that 10 bolts were used after 76 and i have enver seen anyter than 82 with a 10 bolt front only dana 44 or 60

    when was 44 discontinued on GM trucks and when was 10 bolt used first ?
    i knwo it had to be at least 80 cuz i know for fact 79 stil use dana 44, including my own.

    thanks
     
  2. imiceman44

    imiceman44 1 ton status

    Joined:
    Aug 5, 2002
    Posts:
    15,160
    Likes Received:
    1
    Location:
    Sacramento, CA
    78 was the year they started using the 10 bolt, and you could see both untill 80 where they went with the 10 bolt.
    I could be wrong but all the documents I read so far say that
    IceMan
     
  3. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    sounds right to me, thanks!
     
  4. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    According to thatK30guy, our professional GM truck stripper /forums/images/graemlins/wink.gif : "The last year for the D44 front axle was '82, but only in the GMC line. Chevy's last year for the D44 was '79." /forums/images/graemlins/cool.gif
     
  5. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    Thanks, Harry! /forums/images/graemlins/wink.gif /forums/images/graemlins/laugh.gif

    And...the first year for the 10 bolt front axle was in '77, when the "second design" stuff started. /forums/images/graemlins/wink.gif
     
  6. 74Chev

    74Chev 1/2 ton status

    Joined:
    Sep 19, 2002
    Posts:
    102
    Likes Received:
    0
    Location:
    Oregon
    That sounds exactly right to me. My 79 jimmy has a 10 bolt front. Both axles were used around that time.
     
  7. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    jimmy/blazers must have been different deal then, i saw in specs page tht 79 is 10 bolt on blazers jimmies, but i kow that pickups were stil using 44's in '79 for a fact, either that or i have seen rare trucks, so hmmm....

    interesting,
     
  8. Great78burb

    Great78burb Registered Member

    Joined:
    Sep 24, 2002
    Posts:
    28
    Likes Received:
    0
    Location:
    San Diego, CA
    I have a '78 Chevy burban and it has a 10 bolt up front. Wouldn't it be nice if GM could make up their mind?
    /forums/images/graemlins/rotfl.gif /forums/images/graemlins/burb.gif
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,169
    Likes Received:
    1,368
    Location:
    E-town baby!
    My 81 Jimmy (GMC) came with a 10 bolt front and 12 bolt rear. Maybe the pick-ups still got 44's til 82?

    Rene
     
  10. imiceman44

    imiceman44 1 ton status

    Joined:
    Aug 5, 2002
    Posts:
    15,160
    Likes Received:
    1
    Location:
    Sacramento, CA
    Guys,
    As I said earlier, GM was transitionning in late 70's and that's why you would find both in the same year,, and that is not to mention the fact that a truck that old could have had the axles replaced and since they interchange, one would use either.
    I had a 73 with a 10bolt, I was sure it was replaced because they didn't have that option back then I had the broshures to prove it.
    And as someone on this thread said, Chevy dropped the D44 earlier than GM or was it the opposite? /forums/images/graemlins/smile.gif
    Anyway... They were confused why wouldn't we be /forums/images/graemlins/smile.gif
    IceMan
     
  11. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    It could be, but it's like imiceman said...GM was transitioning the move. /forums/images/graemlins/wink.gif

    What I've read and believe (and seen, too), is since the 10 bolt was made, it was probably something cheaper for GM to get for the trucks. This is why the 12 bolt "phased out" in '83 as '82 was the final year for any 12 bolt rear axle. I believe the 10 bolt was cheaper to make, supply, and buy, so GM stuck those under the trucks.

    As for the D44's, they were under contract with Dana/Spicer and GM, and when GM decided they wanted to test or use the 10 bolt, they had to use up the final year(s) of the contract with D/S. Once the contract was up and the remaining axles used up, the 10 bolts were made "full time" by '83. /forums/images/graemlins/wink.gif This is why the GMC line had D44's up to '82 as did all the half ton trucks running the 12 bolt rear up to '82 also. /forums/images/graemlins/tongue.gif
     
  12. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    definitely up to 82 on the 12 bolt yes, 82 have 10 bolt rears as far as ive ever seen,
     
  13. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    My guess would be that the gear ratio had something to do with it also. They may have had more of one ratio than another that was leftover. So for example, they could have been building 3.08's with 10-bolt axles, but using leftover 44's when the build sheet called for 3.73's or something that was still in a warehouse somewhere.
     
  14. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    And.../forums/images/graemlins/wink.gif

    Even if GM did use the 10 bolt's as an excuse to get away by cheap stuff, they still had to use the fawking 2.73 gears!!! /forums/images/graemlins/mad.gif /forums/images/graemlins/tongue.gif

    Man! I hate that ratio! I swear if someone ever came up to me and said anything about 2.73 gear ratios, I'm gonna strangle them!! /forums/images/graemlins/tongue.gif /forums/images/graemlins/laugh.gif
     
  15. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,169
    Likes Received:
    1,368
    Location:
    E-town baby!
    That was the stock ratio for my Jimmy...2.73's, 31" tires and a 4 speed. /forums/images/graemlins/eek.gif /forums/images/graemlins/eek.gif

    Great freeway mileage /forums/images/graemlins/rolleyes.gif

    Rene
     
  16. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    So did my first Blazer...the '84. /forums/images/graemlins/tongue.gif Luckily, I sold that so I wouldn't have to put (waste) any more money in that truck. /forums/images/graemlins/tongue.gif
     
  17. bigjbear

    bigjbear 1 ton status Staff Member Moderator

    Joined:
    Feb 18, 2000
    Posts:
    13,966
    Likes Received:
    448
    Location:
    Marietta GA
    My '80 came w/ 2.73s. Whoever decided that ratio should go into a truck must have OK'd the Pontiac Aztek as well.
     
  18. bigjbear

    bigjbear 1 ton status Staff Member Moderator

    Joined:
    Feb 18, 2000
    Posts:
    13,966
    Likes Received:
    448
    Location:
    Marietta GA
    Wes, you're not saying all GMCs had the D44 untill '82, right? You're saying the GMCs could have had the D44 untill '82, right? Just want to clarify.
     
  19. Jeff427

    Jeff427 1/2 ton status

    Joined:
    May 22, 2000
    Posts:
    1,186
    Likes Received:
    0
    Location:
    Gladwin, MI
    </font><blockquote><font class="small">In reply to:</font><hr />
    And...the first year for the 10 bolt front axle was in '77

    [/ QUOTE ]
    My '77 has it's original 10 bolt front axle with 3.73 gears.
     
  20. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    No, GMC's had both 10 bolts and D44's. Just the D44's ran up to '82 on that line of trucks. And by "trucks" term, I mean ALL the trucks...K1500, K2500, Jimmy's, Subs, etc. Not just the pick-up trucks.
     

Share This Page