Some help needed

Discussion in '1955-1959' started by Lasse Sweden, Nov 20, 2018.

  1. Lasse Sweden

    Lasse Sweden Member

    Joined:
    Nov 20, 2018
    Messages:
    5
    Hi I have a GMC 100 (2)1955 I want change gear in rear axle if I understand right I have H 033 GM SS . Have today 3,90 I think and see maybe 3,38 fits problem is I don’t now where to order so I get right, if anybody can help me order number and company , are living in Sweden so most be right first time when I order
     

    Attached Files:

  2. Bill Hanlon

    Bill Hanlon Member

    Joined:
    Jun 4, 2002
    Messages:
    2,359
    Location:
    Klein TX
    Even though our host's web page here Rear End Gears-3.38 Ratio-Classic Chevy Truck Parts says "Chevrolet only", I believe their 3.38 gears will fit all 1955.2 and some 1956 GMC 100 series trucks. In '56 you could get an OPTIONAL Spicer 45 rear axle in the 100 series GMC trucks. The Spicer axle became standard in 1957 for GMC. Chevrolet stayed with the H033 into the 1960s. The H033 has a round rear cover, while the Spicer rear cover is not round.

    Changing out the gears and properly adjusting clearances and backlash is not something for the do-it-yourselfer to try himself.
     
  3. Lasse Sweden

    Lasse Sweden Member

    Joined:
    Nov 20, 2018
    Messages:
    5
    Thanks Bill, rear cover is round and I have put a picture on that to , better to ask you people over there who now best regards Lasse
     

    Attached Files:

  4. vwnate1

    vwnate1 Member

    Joined:
    Jan 1, 2000
    Messages:
    10,979
    Location:
    AMERICA !
    Let us know how it goes .

    The ring gear will have both ratio and GM P/N on it, might be helpful to post the GM P/N and how many bolts hold the ring gear to the carrier......

    More info helps those who know this stuff better than I, what to tell you .

    I assume you have a V8 engine ? .
     
  5. Lasse Sweden

    Lasse Sweden Member

    Joined:
    Nov 20, 2018
    Messages:
    5
    I have 6 cylinders engine, sounds like I have one gear missing when I drive in 4 gear(hydra magic ) that’s why I want to change gear in axle. We have winter here now and the truck is in a garage so I wait 3 months before I take the truck home and take out the gear from axle .
     
  6. Bill Hanlon

    Bill Hanlon Member

    Joined:
    Jun 4, 2002
    Messages:
    2,359
    Location:
    Klein TX
    What size rear tires?
     
  7. Lasse Sweden

    Lasse Sweden Member

    Joined:
    Nov 20, 2018
    Messages:
    5
    235/75R15
     
  8. Bill Hanlon

    Bill Hanlon Member

    Joined:
    Jun 4, 2002
    Messages:
    2,359
    Location:
    Klein TX
    215/85R16 would only decrease RPM by 10%. Probably not worth the money.
     
  9. Lasse Sweden

    Lasse Sweden Member

    Joined:
    Nov 20, 2018
    Messages:
    5
    I have to wait until i get the truck home again and take out the gearing and see if there are any numbers on it
     

Share This Page