Diff centre help
#1
Posted 27 January 2020 - 02:20 PM
Can anyone confirm which diff centre I have in my LJ.
I’m pretty sure it’s 3.08 as it revs at around 2700rpm at 100k’s
Is it coarse or fine spline?
I thinking of changing it to 3.36 or maybe 3.55
Here’s a pic of the numbers on the Vicente.
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#2
Posted 27 January 2020 - 02:28 PM
Haven't looked at a banjo for a long time but that doesn't look like a 2.78 or 3.08. I'd say you already have a 3.36 or 3.55. You can't tell if its fine or coarse spline from that picture, have to pull an axle out. That code is the date the centre was cast.
#3
Posted 27 January 2020 - 03:12 PM
Take a pic of the underside of the diff. The ratio should be stamped into the face of metal flange on the yoke.
Edited by S pack, 27 January 2020 - 03:13 PM.
#4
Posted 27 January 2020 - 04:12 PM
Flat plate under diff yoke should syill have ratio stamp on it....vaguely remember dudes could get rough idea of ratio looking at the 2 bottom bolts whether they're short or long.
Majority of diffs were coarse spline but easiest way is pop axle out.
#5
Posted 27 January 2020 - 04:49 PM
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#6
Posted 27 January 2020 - 04:53 PM
Being a Torana S XU1 tribute it will likely be a 3.08 course spline open centre but as it is not the original banjo for the car then anybody's guess really
#7
Posted 27 January 2020 - 04:53 PM
At that rpm i agreeOdds on it’s a 3.36 coarse
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#8
Posted 27 January 2020 - 07:13 PM
3.08 would be 2700rpm
3.36 would be 3100rpm
3.55 would be 3300rpm
I’ll have to Jack the car up to have a look at the stamp on the diff as it’s too low to get under
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Edited by Gatti, 27 January 2020 - 07:15 PM.
#9
Posted 27 January 2020 - 08:51 PM
I read the rpm versus ratio would be like below at 100 km/h?
3.08 would be 2700rpm
3.36 would be 3100rpm
3.55 would be 3300rpm
I’ll have to Jack the car up to have a look at the stamp on the diff as it’s too low to get under
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Perhaps you need Jenny Craig
#10
Posted 27 January 2020 - 09:07 PM
Perhaps you need Jenny Craig
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#11
Posted 06 February 2020 - 10:07 AM
I swapped out the diff centre last night and it was a 3.08
I've learnt a bit about them now and hadn't realised that 2.78 and 3.08 have the 'long bolt' case and 3.36 and 3.55 are 'short bolt' which is easy to identify.
I took the car for a quick run around the block last night and it feels good with the 3.55's, but I just need to wait for the rain to stop so I can take it for a long run
#12
Posted 06 February 2020 - 10:15 AM
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