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Thread: differential oil

  1. #1
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    Default differential oil

    Hey I got a 04 Monarch 2, any special differential oil I need to be using on a trike? I heard that the synthetic is not good to use?

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    Lehman recommended 75-90 gear oil (non-synthetic).

    I have used only synthetic for the last 18 years on all shaft-driven builds (200 or so) without problems provided there are no leaks.
    Jim Murphy
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    WHEN HELP IS OFFERED, A SIMPLE "THANK YOU" IS APPRECIATED.

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    Quote Originally Posted by Lee H. Mann View Post
    Lehman recommended 75-90 gear oil (non-synthetic).

    I have used only synthetic for the last 18 years on all shaft-driven builds (200 or so) without problems provided there are no leaks.
    cool, thanks Jim

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    500+ Posts Mick's Avatar
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    Jim mine has a leak what do you do for leaks from the seal at the front of the differential?

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    Quote Originally Posted by Mick View Post
    Jim mine has a leak what do you do for leaks from the seal at the front of the differential?
    Pinion Seal time ...... clean the front of the differential housing with Brake-Kleen and determine exactly where the leak is.

    Seals leak from 3 different places the inner rubber surface, the outer housing to seal surface or the pinion splines themselves.

    The last two can be corrected without changing the seal.

    Since you have a Monarch II, if you haven't change the 3 bolts on the differential cover and are planning on a pinion seal, now would be the time.
    Jim Murphy
    Lehman Tech since 1998
    Champion Tech since 2005
    Lehman & Champion Dealer Owner Operator
    Iron Butt Rider 2001

    WHEN HELP IS OFFERED, A SIMPLE "THANK YOU" IS APPRECIATED.

  6. #6
    500+ Posts Mick's Avatar
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    Unfortunately with mine I no longer have the ability to do major work like that and the closest dealer to do it is 242 miles away and I would have to stay at a hotel overnight while they work on the trike. Im running Redline 75/90 hypoid oil in the rear right now.

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