Simon, I did look at this very thing, and the inner CV joint does appear to be running rather strangely! I must admit I didn't try to stop them though to see what both sides were doing. I'll do this tonight and check. Cheers

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4age 20V powered Mini

thinking about the diff, I considered that maybe the whole diff assembly is sitting at an angle in the housing, but it couldn't be that as the output shafts would keep a constant angle...

it's really only possible that the output shafts are flopping around - maybe it's just that the fibre washers have collapsed - but you'd be able to move the output shafts up/down/back/forward/in/out by hand

I'd love to be there to see what it's like when you pull it apart

where do you live? (your profile doesn't have a location)

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did I tell you that I won a trophy?

If the driveshaft is orbiting in the pot joint (inner CV) it may have mismatched parts.
There are 2 inside diameters, depending on how old and where made. Small inner spider will fit into big CV but it doesn't drive properly. As I found out...
Diameter difference is around 1.5 mm or so.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I'm in Perth, WA so a fair hike!!

Now I'm into the diff side of things my problems are Toyota related! Gearbox is a C52 variety. The inner CV joints are Toyota too!
On the back of my setup I have a half shaft (jack shaft?) which I have noticed is also oscillating. I have also now removed that too and clocked
it and believe it to be running true.

The engine removal starts tonight!!

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4age 20V powered Mini

lol - you should have said that it was a toyota engine from the start - straight away the response would have been "the problem is at the Toyota end, it couldn't possibly be a problem with the mini parts!!"

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did I tell you that I won a trophy?

Probably could have led with that in you first post...

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt

I'm wondering if it could be related to the driveshafts being a little bit long and under bump are running out of room to move inside the inner CVs?

Just I didn't find it all that easy to accurately measure how long the driveshafts should be...

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Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

So is it the LSD box with equal length driveshafts...or not?

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"Show me the Mini!"

Billet driveshafts or welded?

LOL - apologies
I thought it was in my signature/profile !

TBH - I was so convinced that the CV joints (inner & outer) would eliminate any misalignment from the gearbox,
especially at the low speed, that I thought it could only be the hubs!

Driveshafts are welded, they have been checked on a machine lathe and pretty close to true.
The problem hasn't always been there so I am pretty sure the driveshaft length is OK. I did check it again though
and I've got around an inch (at inner CV joint) of clearance at normal ride height.

The gearbox is a C52 so it is not LSD but has a half shaft(?) on the back. The driveshafts are equal length from
the inner CV joints to the hubs.

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4age 20V powered Mini

An inch of movement in or out on the inner CV? With the lower arm about horizontal should be as 'long' as the driveshaft needs to be, full droop and full compression should be shorter than this. normal ride height is generally with the lower arm pointing up a little towards the centre...


What about the halfshaft or perhaps the carrier bearing on the back of the block?

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Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

What about #432 - engine is not mounted parallel and/or at right angles to fwd direction of road wheel alignment

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"Show me the Mini!"

no - that couldn't cause this issue - whatever angle the outputs from the gearbox is at remains the same, the driveshafts keep that same angle, the outer CVs keep the same angle

This issue is caused by something constantly changing angle

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did I tell you that I won a trophy?

Just an update, I have the engine and gearbox out and am now having a friend do a minor rebuild of the gearbox!
Hopefully will have some more information soon.

I did check the halfshaft and it seems to be true with the carrier bearing in good condition also.

It could be some type of carrier in the diff or the diff output which is moving, I guess I'll find out soon!!

Thanks for all the helpful ideas!

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4age 20V powered Mini

Uhhhh huh...

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"Show me the Mini!"