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2.73 10 botl axle rant !

Discussion in 'The Lounge' started by R72K5, Sep 9, 2003.

  1. R72K5

    R72K5 Banned

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    the 78 gmc c1500 out here has a 10 bolt 8.5" and i had the stamping code RUB looked up and the dealer says its frickin 2.73 ratio,.........


    ahhhhhhhhhhh! !!!!!! why in the hell did GM build and install so damn many 2.73 10 bolt 8.5" axles, i keep finding them left anf right now, under the lightest 1/2tons, the ones with only four 52" rear leaf springs, never find this junk undert he big 10s and anything with the 56" 8 leaves in rear.. they always have at least 3.07 if not 3.40- 12 bolts, even a 3.07 would be better than this 2.73 garbage, i do have a 3.07 eaton posi 12 botl out here i might just put under, but its not a huge difference in ratio though, so i dunno...


    man.....

    grrrrrrr........ piece of crap junk 2.73 ratio......

    boy they sure got in a hurry to start using the 10 bolt axles on the rear, even alot of 77's have the 10 bolts under them even, wish i would have saved some of the perfectly good 67-69 c-10 12 bolt 3.73 axles i simply disassembled and junked a could years back..


    sigh....
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    My 81 Jimmy came with a 12 bolt stock...










































    and 2.73's /forums/images/graemlins/rolleyes.gif

    Rene
     
  3. kennyw

    kennyw N9PHW Premium Member

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    That is not as bad as the 2.56 ratio 10b/12b my friend found came in his '81 K10 /forums/images/graemlins/eek.gif
     
  4. R72K5

    R72K5 Banned

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    [ QUOTE ]
    My 81 Jimmy came with a 12 bolt stock and 2.73's /forums/images/graemlins/rolleyes.gif

    Rene

    [/ QUOTE ]

    12 bolt was through 82, what size leafpacks and how many leaves per pack originally on the truck ?

    on a side note:

    interesting.. you sure its not 2.73 ratio instead? ive only seen 2.73 in 10 bolts and 2.76 in 12 bolts, and ive been through alot of trucks and axles, hmm..
     
  5. R72K5

    R72K5 Banned

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    [ QUOTE ]
    That is not as bad as the 2.56 ratio 10b/12b my friend found came in his '81 K10 /forums/images/graemlins/eek.gif

    [/ QUOTE ]

    i remember once finding 2.56 ratio in a 77 or 79 c-10 bonanza pickup, it had power doors and ratio listed on SPID label, i remember it being an oddball ratio, 2.56 was normally only in cars and mainly in the 7.5" axle
     
  6. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> I guess that I was a lucky bastard, I bought my 78 when I knew nothing of these trucks. It had come from the factory with a 6 cyl that was later swapped to a 350, so I ended up with a small block and factory 4.10s. Too bad I roached the gears in both of them by running 38s. /forums/images/graemlins/rolleyes.gif </font>
     
  7. R72K5

    R72K5 Banned

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    [ QUOTE ]
    <font color="green"> I guess that I was a lucky bastard, I bought my 78 when I knew nothing of these trucks. It had come from the factory with a 6 cyl that was later swapped to a 350, so I ended up with a small block and factory 4.10s. Too bad I roached the gears in both of them by running 38s. /forums/images/graemlins/rolleyes.gif </font>

    [/ QUOTE ]


    yeah, only bad thing about series 4 gear ratios is that the pinion gear diameter is alot smaller than series 3 ratios

    ill find out for sure if 4.10 was factory available in 10 series trucks as soon as the GM specs sheets i ordered get here, i ordered for 76 and 78 years chevy trucks, as far as i have ever seen or heard 3.73 was deepest 10 series ratio ever offered, and in 63-72 years 3.73 was std.equipment.


    we'll see ! /forums/images/graemlins/laugh.gif
     
  8. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> The gears that were in the truck were GM gears and the speedo was correct, so if they were changed someone did a complete job on it. The truck was bone stock other than the engine change, it appears that it spent most of it's life working hard somewhere in Washington state. I am 99.9% sure that 4.10s were pretty common in the 6 cyl trucks. </font>
     
  9. HarryH3

    HarryH3 1 ton status Author

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    [ QUOTE ]
    ill find out for sure if 4.10 was factory available in 10 series trucks as soon as the GM specs sheets i ordered get here, i ordered for 76 and 78 years chevy trucks, as far as i have ever seen or heard 3.73 was deepest 10 series ratio ever offered,

    [/ QUOTE ]

    I don't know what the magic incantation was that you had to recite to get 4.10's back then, but they were available in K10's. I had a '77 K5 that came with 3.08's. Needless to say, they really sucked with 36 inch tires. /forums/images/graemlins/eek.gif But a guy I worked with had a '76 or '77 K10 pickup with factory 4.10's. He hated the 4.10's because he ran stock size tires and this was long before overdrive trannies were common. /forums/images/graemlins/shocked.gif So we jacked our trucks up side by side one weekend and swapped axles between our trucks. He was happy with the 3.08's and I was happy with the 4.10's. /forums/images/graemlins/thumb.gif
     
  10. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Our 67 C10 came with a 327 and standard and has 4.10 gears in the 12 bolt rear from the factory...
     
  11. landsmasher

    landsmasher 1/2 ton status

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    My 78 K5 came with a 12 bolt with 3:08 gear ratio. It's a fed truck. Don't know if that means anything.
     

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