rob_king
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| posted on 7/3/12 at 10:01 AM |
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Sierra Diff Swap In Turbo Busa Westfield
Hi all, first post. I see there is plenty of knowledge on here of Sierra diffs but i couldn't find an answer to my exact problem so hopefully
someone can help.
I'm changing from a 3.9 LSD 7.5" Sierra diff with Lobro joints to a 3.3 non LSD 7" diff with push in joints. (or at least i hope i
am if it's possible)
The question is what needs to be done in order to get these components to fit?
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madteg
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| posted on 7/3/12 at 11:25 AM |
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Why not put the 3.3 crown wheel and pinion in the LSD diff
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DIY Si
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| posted on 7/3/12 at 11:29 AM |
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It's possible, but the 7.5" and7" diffs have different case sizes, so it may not slot straight in.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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rob_king
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| posted on 7/3/12 at 11:42 AM |
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that would be an ideal solution but i dont think that is possible. I was led to believe that crown wheel and pinion are different on the 7" and
the 7.5" and not interchangeable. or was it that the LSD is not interchangeable between the 705" and the 7". I cant remember. Can
anyone confirm or deny?
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Wadders
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| posted on 7/3/12 at 01:35 PM |
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Might be worth digging deep and buying a Quaife or Tran-x kit for your 3.3 diff, sell the existing viscous LSD to go towards it.
Personally i don't think the viscous diffs are much use in a lightweight car, especially when most have a rake of miles on them.
Can't fault the Quaife unit, but have heard the Tran-x is even better.
Al.
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CNHSS1
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| posted on 7/3/12 at 02:48 PM |
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quote:
Originally posted by rob_king
Hi all, first post. I see there is plenty of knowledge on here of Sierra diffs but i couldn't find an answer to my exact problem so hopefully
someone can help.
I'm changing from a 3.9 LSD 7.5" Sierra diff with Lobro joints to a 3.3 non LSD 7" diff with push in joints. (or at least i hope i
am if it's possible)
The question is what needs to be done in order to get these components to fit?
may be interested in the 7.5" LSD if you decide to sell? drop me a u2u
Cheers
CNH
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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rob_king
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| posted on 7/3/12 at 02:51 PM |
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the Quaife option just isn't a runner for me based on cost i'm afraid
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snapper
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| posted on 7/3/12 at 03:41 PM |
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The 7" diff is called that because the crown wheel is 7" diameter
The 7 1/2" diff is guess what 7 1/2 " diameter swap not possible.
Lobro to push fit needs some shaft modification as the push fit shafts are smaller than lobro.
You can fit lobro ends to push fit shafts but need the Desiel push fit shafts, I've been looking for years.
There are rumours you can fit lobro stubs to push fit diffs, we have for a Super Stock oval but it needed some adjustment as the stubs locked the
planet wheels
The option for you is do without the LSD or put the crown wheel and pinion from the 3.3 into a 3.6 7" LSD flog on your 7 1/2"
Nothing is simple with a kit car.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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rob_king
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| posted on 7/3/12 at 03:49 PM |
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ok that's most helpful. I had accepted that i was going to have to loose the LSD. Assuming i cant get Diesel push in shafts it sounds like
putting the lobro stubs into the 7" push in diff is the only option left. You mentioned some adjustment was necessary, could you elaborate a
little?
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atomic
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| posted on 8/3/12 at 09:56 AM |
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Dont fancy the cost of a Quaife ATB..then take a look at the EATON Truetrac
http://www.mc2racing.com/products/xr4ti/driveline/differentials/index.html
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Liam
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| posted on 8/3/12 at 01:00 PM |
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3.36
7.5" diff
Then swap over the LSD.
[Edited on 8/3/12 by Liam]
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rob_king
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| posted on 8/3/12 at 01:19 PM |
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oo that looks perfect...if it is a 3.3. seller contacted. Thanks for the heads up.
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rob_king
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| posted on 9/3/12 at 01:18 PM |
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bought it.
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Liam
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| posted on 9/3/12 at 05:09 PM |
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Deffo a 3.3 - cool!
So now all you need to do is stick the LSD mech into the 3.3 case and have yourself a 3.3 LSD.
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rob_king
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| posted on 12/3/12 at 02:28 PM |
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Anybody know the weight of the 7.5" diff? i'm guessing 35-40kgs. Getting some crazy prices to get it shipped to Ireland
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Liam
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| posted on 12/3/12 at 03:18 PM |
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A 7" is around 26kg, so add a lilttle more for a 7.5" and packaging and that's probably about right.
Parcel monkey?
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rob_king
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| posted on 12/3/12 at 03:24 PM |
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wow they want over £100! there seems to be some good deals on ebay but most have a 30kg weight limit
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Liam
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| posted on 12/3/12 at 06:45 PM |
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Yikes!
Hmmm if you ask the seller to ditch the rear rubber mount, drain it and maybe even take the flanges out into a seperate small package, the diff itself
could come under 30kg if that's some sort of silly price threshold?
Wonder if the Locostbuilders delivery service extends to the Emerald Isles - maybe someone is planning a holiday by ferry?
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rob_king
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| posted on 13/3/12 at 08:55 AM |
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Got it sorted through PPL logistics via ebay. £26. 00 which is a bit more like it!
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Liam
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| posted on 13/3/12 at 08:02 PM |
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Good to hear
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