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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Feb 2022
Posts: 61 Likes: 3
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2022
Posts: 61 Likes: 3 |
We are about to change the lubricants in our 4 speed Rover gearbox and the LSD differential. While I've been browsing around, it's not totally clear what to chose. The Morgan Handbook says 75W/80 gear oil for the 4 speed box, but doesn't mention GL4 or 5..? And for the rear LSD diff, it says Hypoid SAE 90 LS. Hence, are there consensus about what to use and are there any prefenential brands to go for? Cheers /Finn
Finn. 1973 Morgan +8. 1959 Austin Healey 3000 BN7 2-seater. 2009 Mazda MX-5 2.0 PRHT.
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Joined: Feb 2016
Posts: 8,697 Likes: 416
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,697 Likes: 416 |
I used Redline full synthetic 75W/90 LSD oil in my BTR axle. Click image for source. ![[Linked Image]](https://i.ebayimg.com/images/g/yZQAAOSw2FVbSH-W/s-l1600.jpg) It cured the clicking I got when manoevering on full lock, suggesting the friction modifier works better than that in the factory supplied oil (assuming it included any). Note that I found my axle required more than the handbook suggested (1.6 litres) so had to order a second bottle.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Apr 2017
Posts: 1,799 Likes: 4
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Apr 2017
Posts: 1,799 Likes: 4 |
Don't use GL5 in the gearbox. Synchro rings don't like the EP additives.
Bob
2009 Black Roadster
1999 4/4 2 litre Zetec
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Joined: Dec 2009
Posts: 37,481 Likes: 989
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,481 Likes: 989 |
Finn, I don't know about the 4 speed box but I use this in my Plus 8 LSD.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Jul 2007
Posts: 27,840 Likes: 764
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,840 Likes: 764 |
Plenty of advice here on gomogYou don't say the year of car but hopefully you can find the right one.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: May 2014
Posts: 5,442 Likes: 133
Black Rat Charter Member
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Black Rat Charter Member
Joined: May 2014
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Keith
2013 narrow bodied + 4 Ruby.
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Joined: Feb 2022
Posts: 61 Likes: 3
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2022
Posts: 61 Likes: 3 |
Thanks to you all for advice. Cheers /Finn
Finn. 1973 Morgan +8. 1959 Austin Healey 3000 BN7 2-seater. 2009 Mazda MX-5 2.0 PRHT.
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