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tips, technology, tools and techniques related to vehicle driveline components

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BOOTLEG
Gary Rosema
Wisconsin
(47 posts)

Registered:
11/18/2013 07:26PM

Main British Car:
1978 MGB Rover 3.5L

Differential Lube
Posted by: BOOTLEG
Date: December 17, 2015 08:27AM

I'd like some commentary on recommended diff lube for my new 3.31 gear set. Dick Luenning recommends 140W but that may come from all his race time on the track. I bought a quart yesterday but thought I'd get some opinions before I pour it in. Also besides weight, anybody using synthetic?


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Differential Lube
Posted by: BlownMGB-V8
Date: December 17, 2015 01:42PM

I use 75w90 synthetic. The gears will hold up better with it.

Jim


mgb260
Jim Nichols
Sequim,WA
(2461 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Differential Lube
Posted by: mgb260
Date: December 17, 2015 03:59PM

I like 85-140 synthetic. Also the MGB Salisbury has copper/brass pinion thrust washers that require GL4 lube and most new lubes are GL5 and will eat them up. There may be steel ones from another axle that will interchange. Glenn Towery sells Stainless thrust washers for the side spider gears to replace the fiber ones.


BOOTLEG
Gary Rosema
Wisconsin
(47 posts)

Registered:
11/18/2013 07:26PM

Main British Car:
1978 MGB Rover 3.5L

Re: Differential Lube
Posted by: BOOTLEG
Date: December 18, 2015 09:27AM

Here is a detailed explanation of GL 4 & 5 ratings.

I checked my new quart of 140W and it is GL5. I will investigate the synthetics to see if sulphur is added.


[www.widman.biz]


MGBV8
Carl Floyd
Kingsport, TN
(4511 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Differential Lube
Posted by: MGBV8
Date: December 18, 2015 10:12AM

As posted in the "MGB V8 Rear Diff " thread.

Some run 75w90, some use 75w140. Some run this in either flavor.

[www.royalpurpleconsumer.com]


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