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  #1  
Old 3rd November 2012, 04:57 PM
Shorty Shorty is offline
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Default 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?





Last edited by Shorty : 3rd November 2012 at 05:00 PM.
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  #2  
Old 4th November 2012, 10:41 AM
Shorty Shorty is offline
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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?
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Old 4th November 2012, 11:00 AM
robo robo is offline
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Nearside is the short one, Save this site cos its filled to the top with useful blurb.

http://www.super7thheaven.co.uk/Sier...r_Drive_Shafts

Bob
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Old 4th November 2012, 10:03 PM
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voucht voucht is offline
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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
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Old 5th November 2012, 07:24 AM
Shorty Shorty is offline
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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.
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Old 1st January 2013, 12:16 PM
Shorty Shorty is offline
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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.
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Old 1st January 2013, 03:04 PM
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alga alga is offline
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Yes, that is correct.
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Old 1st January 2013, 03:23 PM
Shorty Shorty is offline
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Phew!
Any idea why the drive shafts are different lengths?
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Old 1st January 2013, 03:58 PM
ayjay ayjay is offline
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I think the diff output bearings are offset so this is countered by different shaft lengths.It all comes out in the wash
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Old 2nd January 2013, 08:12 AM
robo robo is offline
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Quote:
Originally Posted by Shorty View Post
Phew!
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

Bob
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Last edited by robo : 2nd January 2013 at 08:15 AM.
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