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Changing gear ratios...

Discussion in 'The Garage' started by PhoenixZorn, Sep 25, 2005.

  1. PhoenixZorn

    PhoenixZorn 1/2 ton status

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    LMC Truck catalogue has me worried now... I have a D44 front and a 12-bolt posi rear end in my Blazer, and I found it has 3.08:1 gearing. Now, with 33" tires, this is all fine and dandy, I run at fairly low RPMs on the highway with my TH350, but eventually plan on swapping out my SM465. I also plan for a future 35" tire upgrade, so the 3.08 gearing will be somewhat lacking. I would like to go with 3.73s or 4.11s, but its my understanding from reading the catalogue that if I do that swap, I need to get a new rear differential case as well as the new ring and pinion set.

    Can anyone shine some light on this subject?
     
  2. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    cases? no

    carriers? yes

    Junkyard carriers for 3.73's shouldn't be all that hard to find.
     
  3. PhoenixZorn

    PhoenixZorn 1/2 ton status

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    am I going to be able to find the a carrier that had posi though? or doesn't it matter...
     
  4. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Doesn't matter if it's posi or not. Posi and non posi carriers are the same externally in relation to R&P mounting.
     
  5. 4xcrazy

    4xcrazy 3/4 ton status

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    why not just go with thick gears?
     
  6. trailblazr81

    trailblazr81 1/2 ton status

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    Even better get a Detroit!!! :waytogo:
     
  7. Executioner

    Executioner 1/2 ton status

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    Which Posi do you have ?
    Eaton Gov-lock maybe. :confused:
     

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