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Thread: Cabrio rear bearing noise?

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  1. #11 Re: Cabrio rear bearing noise? 
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    Sierras have pretty robust diffs. I think you have been unlucky to have one fail. I would not choose based on potential wear. I have been told the 1:9 is best for a 2L Cabrio.
    Paul
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  2. #12 Re: Cabrio rear bearing noise? 
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    Quote Originally Posted by mike woodley View Post
    Hi,
    Thanks again for all the advice. Now looking to buy another push in type diff. Seems to be quite a few to choose from out there.
    Are the push in type diffs the same, apart from ratios, in the full range of Sierra's, i.e.1.6, 1.8 & 2.0 ltr? That is the build, casing, bearings, crown wheel and pinion etc.
    If they are, then my thinking is to go for a diff from a lower power 1.6 or 1.8 as they will have had less stress put on them and should have a lot more life in them.
    Its going into my 200HP V8 Cabrio.
    Am i right in my thinking or not?
    Here is a pic of my Haynes Sierra manual. It would seem that the only difference is two sizes of crownwheel.

    20190616_115049-1224x1632.jpg

    I know that there are two widths of casing, 7ins and 7 1/2 ins, when measured across the top long bolt bracket, but I think this is one difference between push in and bolt on shaft differentials.

    My thoughts on engine size v's diff wear are that total mileage will have a much bigger effect. Once a Sierra is up to speed, which is by far the highest proportion of total journey time, it will use the same power to maintain that speed regardless of engine size.
    Last edited by scott h; 16-06-2019 at 11:09 AM.
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  3. #13 Re: Cabrio rear bearing noise? 
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    Mike,
    having shredded 2 Marina axles I would not recommend an axle from a lower powered vehicle. I have fitted a Ford Capri Laser Axle limited slip diff and after 12years it has not caused any problems (Hope I haven't just jinxed it) go the same hp or a bit higher but I would steer clear of lower.
    Only problem I created was having to widen the car by about 8 inches, and fit a Ford escort mk11 steering rack forward of the front axle.

    Phil
    Last edited by phil.coyle; 16-06-2019 at 03:54 PM.
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  4. #14 Re: Cabrio rear bearing noise? 
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    Thanks for that. Helps my decision making no end.
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  5. #15 Re: Cabrio rear bearing noise? 
    frequent forum contributor Club Member chris_cussen's Avatar
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    I'm willing to be shot down in flames but: ignoring XR4is as far as I know the internals of the Serria diff are good for at least 250bhp regardless of the donor vehicle and diff ratio..
    The differences depend on the type of joints (Lobro or tri-pod) for the half shafts. Lobro were fitted to cars with disc rear brakes.
    You may find this useful https://www.locostbuilders.co.uk/for....php?tid=85080
    Cabrio, Omex 2.0l 150bhp Zetec blacktop, Omex ECU and wiring loom.
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  6. #16 Re: Cabrio rear bearing noise? 
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    I was probably having a grey moment, I forgot the all important details; such as, the Capri Ghia 3.5 Laser axle was a live axle and I removed the saddles from the Marina axle and welded them to the Ford axle, simples, except for the extra 8 inches of width. That's when the real fun started!
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  7. #17 Re: Cabrio rear bearing noise? 
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    Quote Originally Posted by mike woodley View Post
    Thanks for that. Helps my decision making no end.
    I have started a new thread on differential ratios. I thought it would be of general interest and easier to find in its own thread. See:
    https://www.marlinownersclub.com/for...0540#post50540

    I hope you will find it useful.
    Paul
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