scoop
|
| posted on 21/8/15 at 09:15 AM |
|
|
Changing rear Sierra Diffs question
Hi,
I'm changing from the 3.4 with the push in drive shafts to a 3.9 with bolt on 'shafts.
Am I right in thinking that I can just change the cv joints?
If so can anyone recommend a supplier please?
|
|
|
|
|
loggyboy
|
| posted on 21/8/15 at 09:31 AM |
|
|
Outer hubs/carriers will need changing unless you 'hybridise' the shafts.
Mistral Motorsport
|
|
|
kingster996
|
| posted on 21/8/15 at 09:32 AM |
|
|
Useful info here http://forum.wscc.co.uk/forum/index.php/topic/101143-lsd-diff/
I used to be indecisive, but now I'm not so sure
|
|
|
scoop
|
| posted on 21/8/15 at 09:38 AM |
|
|
Is the 3.9 LSD then?
|
|
|
CosKev3
|
| posted on 21/8/15 at 09:41 AM |
|
|
quote:
Originally posted by scoop
Is the 3.9 LSD then?
pretty sure it will be, think there are some odd ball non lsd sierra diffs but 99% are lsd.
doesn't the seller know?
|
|
|
kingster996
|
| posted on 21/8/15 at 09:42 AM |
|
|
quote:
Originally posted by scoop
Is the 3.9 LSD then?
Not always - but LSD's will have bolt on Lobros...
I used to be indecisive, but now I'm not so sure
|
|
|
kingster996
|
| posted on 21/8/15 at 09:43 AM |
|
|
quote:
Originally posted by CosKev3
quote:
Originally posted by scoop
Is the 3.9 LSD then?
pretty sure it will be, think there are some odd ball non lsd sierra diffs but 99% are lsd.
Other way round I'd say Kev - LSD only fitted to XR4x4 and some Cossies I think - but loads of non-lsd Sierras out there
I used to be indecisive, but now I'm not so sure
|
|
|
scoop
|
| posted on 21/8/15 at 09:45 AM |
|
|
I didn't think this was. How can you tell?
|
|
|
kingster996
|
| posted on 21/8/15 at 10:00 AM |
|
|
Usual method is to turn the output shaft on one side - if the other one goes the opposite way, it's an open diff.
There's also some numbers on the diff that can ID it - see here for info http://www.super7thheaven.co.uk/components/sierra_rear_differential/
I used to be indecisive, but now I'm not so sure
|
|
|
scoop
|
| posted on 21/8/15 at 11:12 AM |
|
|
Ok will have a look and give it a go.
|
|
|
scoop
|
| posted on 21/8/15 at 11:42 AM |
|
|
Shame it's not as easy as I thought 
|
|
|
CosKev3
|
| posted on 21/8/15 at 05:16 PM |
|
|
quote:
Originally posted by kingster996
quote:
Originally posted by CosKev3
quote:
Originally posted by scoop
Is the 3.9 LSD then?
pretty sure it will be, think there are some odd ball non lsd sierra diffs but 99% are lsd.
Other way round I'd say Kev - LSD only fitted to XR4x4 and some Cossies I think - but loads of non-lsd Sierras out there
With bolt on shafts???? 
|
|
|
CosKev3
|
| posted on 21/8/15 at 05:17 PM |
|
|
quote:
Originally posted by scoop
Shame it's not as easy as I thought
You won't get much easier a test then turning the output shafts!!!! 
|
|
|
scoop
|
| posted on 21/8/15 at 07:00 PM |
|
|
Lol. No I meant the swap 
[Edited on 21/8/15 by scoop]
|
|
|
CosKev3
|
| posted on 21/8/15 at 07:54 PM |
|
|
quote:
Originally posted by scoop
Lol. No I meant the swap
[Edited on 21/8/15 by scoop]
Oh!
That should be pretty easy too,what are you stuck with?
Or is it the shafts your on about?
|
|
|
kingster996
|
| posted on 21/8/15 at 08:44 PM |
|
|
quote:
Originally posted by CosKev3
quote:
Originally posted by kingster996
quote:
Originally posted by CosKev3
quote:
Originally posted by scoop
Is the 3.9 LSD then?
pretty sure it will be, think there are some odd ball non lsd sierra diffs but 99% are lsd.
Other way round I'd say Kev - LSD only fitted to XR4x4 and some Cossies I think - but loads of non-lsd Sierras out there
With bolt on shafts????
Ah you didn't say that, but still plenty of open diffs with bolt on shafts, just look on evilbay
I used to be indecisive, but now I'm not so sure
|
|
|
scoop
|
| posted on 21/8/15 at 09:07 PM |
|
|
quote:
Originally posted by CosKev3
quote:
Originally posted by scoop
Lol. No I meant the swap
[Edited on 21/8/15 by scoop]
Oh!
That should be pretty easy too,what are you stuck with?
Or is it the shafts your on about?
Yes it's making my current shafts fit the new 3.92 diff. I was sure I had read in the past that you just changed the cv joints and hey presto.
|
|
|
CosKev3
|
| posted on 21/8/15 at 09:55 PM |
|
|
quote:
Originally posted by kingster996
quote:
Originally posted by CosKev3
quote:
Originally posted by kingster996
quote:
Originally posted by CosKev3
quote:
Originally posted by scoop
Is the 3.9 LSD then?
pretty sure it will be, think there are some odd ball non lsd sierra diffs but 99% are lsd.
Other way round I'd say Kev - LSD only fitted to XR4x4 and some Cossies I think - but loads of non-lsd Sierras out there
With bolt on shafts????
Ah you didn't say that, but still plenty of open diffs with bolt on shafts, just look on evilbay
No I didn't,but the OP said in first post the 3.9 is bolt on shafts
quote:
Originally posted by scoop
quote:
Originally posted by CosKev3
quote:
Originally posted by scoop
Lol. No I meant the swap
[Edited on 21/8/15 by scoop]
Oh!
That should be pretty easy too,what are you stuck with?
Or is it the shafts your on about?
Yes it's making my current shafts fit the new 3.92 diff. I was sure I had read in the past that you just changed the cv joints and hey presto.
If you have the correct amount of splines on your push in drive shafts it is that easy,the lobro just goes straight onto your drive shaft.
If you search on here you will find info on doing it,iirc the shafts need to have 23 splines to take a lobro.
|
|
|
scoop
|
| posted on 22/8/15 at 06:39 AM |
|
|
Can you tell me what iirc and lobro means?
|
|
|
SJ
|
| posted on 22/8/15 at 07:05 AM |
|
|
Iirc = if I recall correctly
Lobro is a just a different type of joint to the older tripide joint.
Stu
|
|
|
scoop
|
| posted on 22/8/15 at 07:11 AM |
|
|
Thanks SJ.
So it may be a case of just swapping cv joints if once I have the current ones off I have 23 splines?
|
|
|
kingster996
|
| posted on 22/8/15 at 07:55 AM |
|
|
Depends what you mean by cv joints?
You can swap the individual cv joints on each individual driveshaft so one end is tripode (push in) and the other is lobro (bolt on). That is a hybrid
shaft as per the link I posted.
If you mean swapping the whole driveshaft from one to the other, then as far as I know, this can't be done without also changing the bearing
carrier to suit the shaft.
Happy to be corrected though.
I used to be indecisive, but now I'm not so sure
|
|
|
kingster996
|
| posted on 22/8/15 at 08:01 AM |
|
|
quote:
Originally posted by CosKev3
No I didn't,but the OP said in first post the 3.9 is bolt on shafts
Now your bringing facts into the equation, that's not fair
I used to be indecisive, but now I'm not so sure
|
|
|
scoop
|
| posted on 22/8/15 at 08:01 AM |
|
|
Mine would be hybrid then
|
|
|
scoop
|
| posted on 24/8/15 at 08:35 PM |
|
|
It's an open diff
|
|
|
