Shemster65
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| posted on 6/12/20 at 12:50 PM |
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Sierra diff information
Hi
Can anyone tell me if there is a 7.5” Sierra diff with a 3.14 ratio available or if 7” crown wheel and pinion will fit into a 7.5” casing ?
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mcerd1
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| posted on 6/12/20 at 03:21 PM |
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I've heard of 7.5" diff's with 3.14 ratio's, but never actually seen one for sale (I suspect they were like rocking horse poo,
even when these cars were new)
I believe the 3.36 raito 7.5" diff's may have been a little more common in europe, but the 3.64 is far more common - have you had a look
here:
https://www.locostbuilders.co.uk/forum/9/viewthread.php?tid=85080 ?
or here for more info:
http://www.super7thheaven.co.uk/components/sierra_rear_differential/
I don't believe you can fit a 7" CW&P into the larger casting - they aren't interchangeable like that 
but you can mount a complete 7" diff casing in pretty well an chassis / read beam meant for a 7.5" - all it takes is some different
bolts and spacers 
(the 7" uses 2 long through bolts in place of 4 of the short ones on a 7.5" )
quite a few kits were made to fit either size diff in this way - including my rush
only issue you might have is with driveshafts - it just depends which type and what size you have now (the 100mm bolt-on type will be the easiest, as
they are the same on both diff types)
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fregis
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| posted on 9/12/20 at 01:41 PM |
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7.5 gears are much biger than 7,
also main gear 7.5 use 12 bolts, 7 use 10 bolts.
Also 7.5 center part mauch wider compared to 7
because diferent size of gears i gues it not fit correctly.
i tried 7" gears put to 6.5 diff, almost indentical, but have ~5mm pinion gear offset.
Never be afraid to do what you are insolvent, remember: amateurs built the ark - Professionals built the Titanic.
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Shemster65
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| posted on 9/12/20 at 08:43 PM |
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Ok thanks for the info
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HappyFather
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| posted on 10/12/20 at 09:14 AM |
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quote:
Originally posted by fregis
7.5 gears are much biger than 7,
also main gear 7.5 use 12 bolts, 7 use 10 bolts.
Also 7.5 center part mauch wider compared to 7
because diferent size of gears i gues it not fit correctly.
What about putting the contents of a 7" diff inside a 7,5" casing? Would that work?
A couple years ago I was dreaming about getting a 3,14 LSD 7,5" diff to replace my 3,62 open 7,5". To achieve that I was planing to get a
7" 3,14 and use the CW&P on a 7,5" LSD of any ratio. I had to postpone/abandon the idea (failed to get road legal, divorce, oth€r
prioriti€s), but now I wonder if it would have been possible at all. I had been told by a drift guy that welded diffs that it was possible but never
found confirmation online.
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