Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Gear Ratio

Discussion in 'Peterbilt Forum' started by eiversen, Sep 22, 2012.

  1. Sep 22, 2012 #1
    eiversen

    eiversen Bobtail Member

    1
    0
    Sep 22, 2012
    0
    Hi. I have got a 1994 Peterbilt 379 that I have had for about 5 years. I recently had a rear end go out on me and am considering changing both rears to a different gear ratio. I use it mostly for short hauls (80-200mi) of 35-38 tons with lots of hills. I believe it has a 3406B mechanical in it and it is an 18 speed. My local mechanic that is working on it said it has 3.08 rear ends?? I knew it was high geared but have never even heard of 3.08's. What would be a good gear ratio for my situation? If I change both rear ends to say 3.55's would I need to change anything else? Thanks.
     
    eiversen, Sep 22, 2012
    eiversen, Sep 22, 2012
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Sep 23, 2012 #2
    WorldofTransportation

    WorldofTransportation Heavy Load Member

    702
    577
    Sep 20, 2009
    Your mother
    0
    Had this same set up except I had 390's and a 15 speed..That was the best pulling truck I ever had.... You would need to reset your speedometer..Probably have to get a peterbilt parts man to give you the numbers to flip on the back of it... If it was me I would go 370's or 390's if there is alot of hills.. Don't think you will have to change drive lines or anything like that..
     
    WorldofTransportation, Sep 23, 2012
    WorldofTransportation, Sep 23, 2012
    #2
  4. Sep 23, 2012 #3
    flc120

    flc120 Heavy Load Member

    916
    122
    Jul 11, 2012
    Miami,FL (yeah i know :( )
    0
    for what your pulling and locally 3.70 or 3.90s would be great.
     
    flc120, Sep 23, 2012
    flc120, Sep 23, 2012
    #3
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.