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how to ID front gears

Discussion in '1992-Present Chevy & GMC models' started by beater_k20, May 8, 2006.

  1. beater_k20

    beater_k20 Banned

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    my buddy has an 88 K1500. he snapped an axle shaft in the 10 bolt, so he's replacing it with a 14SF. no big deal there, except that the 10 bolt had 4.10 gears in it. i have yet to see a factory 10 bolt with 4.10s. how can he identify the front gears, to see if they're matching 4.10s or not? dont really want to have to pull the thing apart to find out, and the SPID label is useless, since its badly faded. with 4.10s out back, im not 100% sure it would be accurate anyways
     
  2. daleearnhardt01

    daleearnhardt01 1/2 ton status

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    Id have to agree Ive never seen a 10 bolt with 4.10's Anyways, I cant recall ever seeing a tag on my front diff. Id just turn the driveshaft and count tire revolutions...
     
  3. divorced

    divorced 3/4 ton status

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    Just curious, what's his RPO code?

    Maybe unhook the front driveshaft, engage 4 wheel drive so it will lock the front in, then jack up one side and turn the tire and count how many times the pinion yoke goes around. Simply turning the driveshaft won't work because the front gears are only engaged in 4 wheel drive.

    I've read that if you spin the tire 20 times and have a friend count the pinion yoke revs and then do the math it will be a lot more acurate. Example - turn the tire 20 times and the pinion goes around 82 times. 82/20=4.10



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  4. beater_k20

    beater_k20 Banned

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    i can make out the GU, but everything from there is gone.
     
  5. divorced

    divorced 3/4 ton status

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    Since it is GU I would guess it came stock with 3.42 gears, GU6. The 3.73 and 4.10 gears were GT4 and GT5.
     
  6. daleearnhardt01

    daleearnhardt01 1/2 ton status

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    Yep GU means 3.42s, the rest of em had GT codes...
     
  7. beater_k20

    beater_k20 Banned

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    being a factory option, and being common are two totally different things.
     
  8. daleearnhardt01

    daleearnhardt01 1/2 ton status

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    Well Ive got a 98 Z71 sitting outside in my driveway with 64k miles that has the towing package and it has 3.42's.... So I say otherwise

    Ive also got an 04 Z71 Avalanche with towing package and yep 3.42's
     
  9. beater_k20

    beater_k20 Banned

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    alot of the Z71s (95% are xcab shortbeds) i have seen around here have 14SFs in them too.
     
  10. beater_k20

    beater_k20 Banned

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    trans cooler, oil cooler, and that's about it. both can be had separately.
     
  11. daleearnhardt01

    daleearnhardt01 1/2 ton status

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    Really I didnt know that :rolleyes: :rolleyes: :rolleyes:
     
  12. beater_k20

    beater_k20 Banned

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    hey thanks for hijacking my thread.
     
  13. readymix

    readymix 3/4 ton status

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    Well, I deleted all my replies, sorry to bother you.
    Good luck with your friend truck.
     
  14. daleearnhardt01

    daleearnhardt01 1/2 ton status

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    Hey sorry, all Im trying to say is I have the Z82 towing package and GU6 3.42 gears....
     
  15. beater_k20

    beater_k20 Banned

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    my 93 C1500 had the towing package and 3.42s as well.
     
  16. divorced

    divorced 3/4 ton status

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    Am I the only idiot with 3.73 gears and a tow package? My mama always said I was special! :haha:
     
  17. daleearnhardt01

    daleearnhardt01 1/2 ton status

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    Hey thats better than me and beater with 3.42's :o :haha:
     

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