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-   -   7.5" diff bracket postioning (http://www.haynes.co.uk/forums/showthread.php?t=8624)

Shorty 3rd November 2012 05:57 PM

7.5" diff bracket postioning
Been having a bit of trouble with diff mounting plates cp10.
For starters the plate seems to be about 5mm too big, checked book and it is spot on. I'm pretty sure everything is correct.
Anyone else have this problem?

Next problem I have included a picture of diff with brackets fitted, as you can see the brackets have to be positioned unevenly, do I just ensure input shaft is central? and there is a 14mm gap at the bottom right bolt position. I'm guessing a 14mm spacer will do between there.

Has anyone else used a 7.5" sierra diff?

Shorty 4th November 2012 11:41 AM

That's actually reminded me of another question.
When I stripped driveshafts, I didn't realise that they are different sizes until too late. Does anyone know what side is what?

robo 4th November 2012 12:00 PM

Nearside is the short one, Save this site cos its filled to the top with useful blurb.



voucht 4th November 2012 11:03 PM

Yes, CP10, according to the book's specs, are too long. It is not a big problem.
But one thing is important : you have 2 different measurements between the holes and edges. At one end it is 25mm, at the other end, it is 31mm. The important thing is to put 25mm one at the bottom, and 31mm one at the top.
Place the lower edge of CP10 (25mm end) on the chassis first, and mark and grind the extra length on the top part of CP10 to fit them.
Hope this will help :)

Shorty 5th November 2012 08:24 AM

I did notice that the holes weren't equal at each end an was wondering if it was best to grind from top or bottom, so you have cleared that up. Thanks.

Shorty 1st January 2013 01:16 PM

Another quick question as I'm starting to wonder if ive positioned diff wrong.
I have setup the diff so the diff input is central to the chassis, Is this correct?
With the drive shafts being different lengths I'm wondering if it's supposed to be offset slightly.

alga 1st January 2013 04:04 PM

Yes, that is correct.

Shorty 1st January 2013 04:23 PM

Any idea why the drive shafts are different lengths?

ayjay 1st January 2013 04:58 PM

I think the diff output bearings are offset so this is countered by different shaft lengths.It all comes out in the wash:D

robo 2nd January 2013 09:12 AM


Originally Posted by Shorty (Post 87523)
Any idea why the drive shafts are different lengths?

Cos the crown wheel lives to one side of the pinion gear , this makes the whole diff go slightly off center towards the drivers side .Hence two odd length driveshafts. If the pinion went to the nearside you would get 5 reverse gears :):):)


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