Hymer diff

Discussion in 'Motorhome Chat' started by Bedbug, May 17, 2013.

  1. Bedbug

    Bedbug

    Joined:
    Nov 8, 2012
    Messages:
    13
    Likes Received:
    4
    Anyone ever changed a hymer diff?I read somewhere that someone had changed one for a 309 coach diff ,my old girl feels like she needs another gear and to run a little less noisy in her old age, she's a 1991 s670 , and I love her to bits
     
  2. Snowbird

    Snowbird Funster Life Member

    Joined:
    Apr 24, 2009
    Messages:
    10,141
    Likes Received:
    16,407
    Location:
    Liverpool.
    It is possible to put a higher ratio dif in, but have you considered the problem of having to be constantly changing down at the slightest incline. The Merc 410 running gear is not known for being over powered and you will sacrifice this by uping the gear ratio. The cheapest and easiest solution is go for a taller tyre. I did this on a VW LT with good results.
     
  3. rainbow chasers

    rainbow chasers Read Only Funster

    Joined:
    Oct 30, 2009
    Messages:
    3,747
    Likes Received:
    1,720
    Location:
    Mid Cornwall
    I agree with Snowbird here, raising the ratio will make inclines and initial pull off much harder work and slower for the engine - this will put more strain on the drive train and I doubt you will feel much benefit. Fitting a larger tyre/wheel with have a similar effect but without straining the drive train.

    Don't forget, a motorhome is like a fully loaded van - lots of weight to pull around. Lower ratios work better with weight pulling and have less strain on the engine/transmission and clutch.
     
  4. rolandrat

    rolandrat Funster

    Joined:
    Jan 5, 2013
    Messages:
    436
    Likes Received:
    256
    Location:
    Lancashire
    Just wondering if your model has a direct drive or overdrive gearbox, some are direct drive, as mine was. You can fit an overdrive gearbox without any problem, far better than changing the diff. If your engine was oozing with power then OK but it's probably a good old slogger that wouldn't take to kindly to a diff upgrade.
     
Loading...

Share This Page