tbox
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| posted on 11/6/15 at 08:48 PM |
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Sierra Diff Help!
Hi All,
I leant my car to someone with the mechanical sympathy of a crack-smoking rhino (it was his wedding and I was trying to be nice) and it's come
back with a cracked diff amongst other transmission issues!
It's a sierra LSD 3:62 and I was wondering what my options are...
1. drop it out and replace it? (in which case, is there an easy way of telling if I have a 7 or 7.5 inch version?)
2. drop it out and replace the casing only (in which case does anyone know where I would get a casing only from?)
3. drop it out and get it welded?
4. open a bottle of red wine and hope it fixes itself..
Thanks in advance for help!
Tbox.
"As my grandmother used to say, anything mechanical, give it a good bash." -
Cmdr. Colin Maud, RN
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CosKev3
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| posted on 11/6/15 at 09:09 PM |
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You can measure the width of the top mounting point to determine the size.
Depends where the crack is to how hard it will to weld,as the crack will need to be ground open a bit and needs to be totally oil free for the weld to
take properly.
Replacements are £200 if you land lucky on a bargain,but usually knocking on £300 now for a 7 inch LSD.
Swapping the internals is not a diy job if you've no experience.
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mcerd1
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| posted on 12/6/15 at 08:19 AM |
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You don't have to measure it to know if its a 7" or 7.5" diff
7" ones use long through bolts on the top and bottom mountings like this
7.5" ones have short bolts in threaded holes like this
If your still not sure post a couple of pics and we'll be able to ID it for you 
If you have to pay someone else to rebuild it with a replacement case then it will probably cost as much as a decent condition replacement diff, but
its still going to be a better option than welding it.
I've got to ask - how did he manage to crack the diff casing?
They are normally bomb proof unless you have silly amounts of torque or there is a issue with the way its been mounted...
[Edited on 12/6/2015 by mcerd1]
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Irony
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| posted on 12/6/15 at 09:06 AM |
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Ohhh Shiny....!
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bi22le
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| posted on 12/6/15 at 11:09 AM |
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quote:
Originally posted by Irony
Ohhh Shiny....!
Is that what the english translation is of the red writing on the box?!?!
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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gaz_gaz
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| posted on 12/6/15 at 11:28 AM |
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If you need a 3.62 7" lsd with 100mm joints then i have 1 I've only just got hold of but change of plans means it's now not
needed,
£230 plus the postage which is what it cost me.
Also have a brand new tran-x with again, Brand new, 3.38 crownwheel and pinion
cheers
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tbox
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| posted on 13/6/15 at 11:14 AM |
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Many thanks for all your helpful responses. from the pics I can see I have a 7" on there at the moment. Gaz-Gaz I will U2U about the diff you
have for sale.
all the best,
Tbox.
"As my grandmother used to say, anything mechanical, give it a good bash." -
Cmdr. Colin Maud, RN
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craig5
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| posted on 13/6/15 at 08:48 PM |
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if not sold diff i could also be interested
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tbox
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| posted on 14/6/15 at 08:37 AM |
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quote:
Originally posted by mcerd1
I've got to ask - how did he manage to crack the diff casing?
They are normally bomb proof unless you have silly amounts of torque or there is a issue with the way its been mounted...
[Edited on 12/6/2015 by mcerd1]
Now that is a VERY good question!
I have no idea at all at the moment and probably won't until I get the rest of the bodywork off (a job I started yesterday) and the petrol tank
out as well. from what I can see from underneath, one side of the top fixings has sheered off. I suspect the cause of this might be the way I fixed
it. because of the way the chassis has been designed, it was not possible to thread a rod all the way through, so i had to put a bolt inside each end
and then wind a nut on the outside. clearly not how the thing was designed to be mounted but the only option I had...
once I get her clothes off I will think about constructing a more elegant solution to fitting!
all the best,
Tbox
"As my grandmother used to say, anything mechanical, give it a good bash." -
Cmdr. Colin Maud, RN
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