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Re: Clunking from rear wheel [Re: Fus969] #708181
28/06/21 02:22 PM
28/06/21 02:22 PM
Joined: Dec 2008
Posts: 19,782
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 19,782
South Yorkshire
The 75w90 grade is what I would expect to use in an MGB diff.

For the BTR I use Morris Lubricants, from memory either 75W140 or 80W140.

I don't think the fully synthetic/Semi synthetic difference matters, but it's handy to have it include friction modifier, although this can be bought and added separately.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
Re: Clunking from rear wheel [Re: Fus969] #708182
28/06/21 02:38 PM
28/06/21 02:38 PM
Joined: Dec 2008
Posts: 19,782
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 19,782
South Yorkshire
Just checked, and 75w90 is the gearbox recommended grade for the more recent Plus 4.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
Re: Clunking from rear wheel [Re: Fus969] #708183
28/06/21 02:41 PM
28/06/21 02:41 PM
Joined: Jun 2019
Posts: 894
Aberdeenshire
Gordon D Offline
Talk Morgan Regular
Gordon D  Offline
Talk Morgan Regular

Joined: Jun 2019
Posts: 894
Aberdeenshire
Miller oils website has a handy guide to which lubricant you need, it even lists Morgan. From memory I think the back end oil was 75w 140NT+

No connection, just a happy customer.


Gordon Duguid
2014 plus 4, Montreal blue.
Re: Clunking from rear wheel [Re: Fus969] #708184
28/06/21 03:04 PM
28/06/21 03:04 PM
Joined: Dec 2009
Posts: 28,682
Devonshire
+8Rich Offline
Tricky Dicky
+8Rich  Offline
Tricky Dicky
Member of the Inner Circle

Joined: Dec 2009
Posts: 28,682
Devonshire
https://www.mpdonline.co.uk/product...-ls-gear-oil-gl5-1lt-ls80w901l/LS80W901L

I use this product for my LSD BTR it’s the one the local boys use in their Scoobies.
Used it for 17 years now.

I use Comma lube products for every application on the Plus 8, they are good quality products at Devon (sensible) prices you can overthink lubricants.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: Clunking from rear wheel [Re: Gordon D] #708188
28/06/21 04:40 PM
28/06/21 04:40 PM
Joined: Nov 2015
Posts: 4,055
Northern Capital of Cool
CooperMan Offline
Just barreling along
CooperMan  Offline
Just barreling along
Part of the Furniture

Joined: Nov 2015
Posts: 4,055
Northern Capital of Cool
Originally Posted by Gordon D
Miller oils website has a handy guide to which lubricant you need, it even lists Morgan. From memory I think the back end oil was 75w 140NT+

No connection, just a happy customer.

NT is the posh nano tech stuff, went to a talk at Millers a few years ago & NT grades are clever stuff


Jon M
Re: Clunking from rear wheel [Re: Fus969] #708190
28/06/21 04:43 PM
28/06/21 04:43 PM
Joined: Jun 2015
Posts: 896
North Somerset, UK
Deejay Offline
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Deejay  Offline
Talk Morgan Regular

Joined: Jun 2015
Posts: 896
North Somerset, UK
Thanks for all the contributions on this. Gordon’s & Dave’s memories correlate with Millers who along with Morgan, recommend 75w140.
To my mind, it seemed a bit heavy for a light vehicle. However, Rich is quite happy with the lighter version but as he said...you can overthink these things. Also amazing the price difference between Comma and Morris! (£8 odd vs. £20 odd)
I believe it is more important to ensure that proper LSD oil (or additives) are used in a LSD diff. to cope with shock loadings, more so than the actual viscosity.


Doug

2011 +4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
Re: Clunking from rear wheel [Re: Deejay] #708198
28/06/21 05:31 PM
28/06/21 05:31 PM
Joined: Dec 2009
Posts: 28,682
Devonshire
+8Rich Offline
Tricky Dicky
+8Rich  Offline
Tricky Dicky
Member of the Inner Circle

Joined: Dec 2009
Posts: 28,682
Devonshire
Originally Posted by Deejay

To my mind, it seemed a bit heavy for a light vehicle. However, Rich is quite happy with the lighter version but as he said...you can overthink these things. Also amazing the price difference between Comma and Morris! (£8 odd vs. £20 odd)
I believe it is more important to ensure that proper LSD oil (or additives) are used in a LSD diff. to cope with shock loadings, more so than the actual viscosity.

That is my thinking Deejay that on a lightweight car the standard diff grade is more than adequate but has to be LSD capable.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: Clunking from rear wheel [Re: Fus969] #708202
28/06/21 06:30 PM
28/06/21 06:30 PM
Joined: Jul 2020
Posts: 53
Cheshire
F
Fus969 Offline OP
Just Getting Started
Fus969  Offline OP
Just Getting Started
F

Joined: Jul 2020
Posts: 53
Cheshire
I checked the gomog +8 specific and it states SAF-XJ 1.7 ltrs . this then became syntrax 75w-140 . Now according to opioil website this has been replaced by transmax 75w-140 all castrol oil but I couldn’t find any more info regarding this change I supposed because it’s a long life oil and not something you change regular it doesn’t crop up that often

Re: Clunking from rear wheel [Re: Fus969] #708203
28/06/21 06:34 PM
28/06/21 06:34 PM
Joined: Jul 2020
Posts: 53
Cheshire
F
Fus969 Offline OP
Just Getting Started
Fus969  Offline OP
Just Getting Started
F

Joined: Jul 2020
Posts: 53
Cheshire
Forgot to say mines a 97 so BTR axle Salisbury may be different

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