Reference: Manual Transmission Oil

[rob love]

Originally Posted by Hanno Spoelstra

Wayne, very good subject!

My first question is: do the CMP drive lines have brass/ bronze bushings? I was not aware of that.

Here is a list of modern replacement lubricants which Hendrik van Oorspronk published in one of the issues of Keep The Rolling magazine. I now wonder if the lubricants listed here are the correct ones?

Regards,
Hanno

Lubrication for Ford Canada CMP

Engine:
Original specification: Engine oil. Winter: SAE 10; Summer: SAE 30.
Modern replacement: Mineral 15W/40 oil or if the engine has been overhauled: semi-synthetic 10W/40 oil.

Gearbox / transfer case:
Original specification: Gear oil. Winter: SAE 110; Summer: SAE 140.
Modern replacement: Transmission oil 140 or 85W/140 with API specification GL4. Thickness SAE 110 is no longer available.

Front and rear axle:
Original specification: Extreme pressure Gear Oil. Winter: SAE 80; Summer: SAE 90, over 32º C: SAE 140
Modern replacement: 1st choice: hypoid oil GL5 80W/90, or if you have 1 oil for the gearbox and use the axes GL4 80W/90 or GL4 85W/140

Grease points and CV joints (stub axles):
Original specification: Wheel Bearing Lubricant
Modern replacement: Lithium EP 2 grease

Steering box:
Original specification: Gear oil
Modern replacement: Gearbox oil GL4; a good alternative is a 0 or 00 grease, this lubricates at least as well and it wheelhouse no longer leaks.

Hanno
I believe there is a thrust pad in the Ford differentials that is bronze. And certainly the steering box is going to have brass bushing for the pitman shaft.

Re the Chev transmissions, if the transmission has been replaced with one of later production with synchros, then you are going to have brass synchro rings.

I don't think there is much for brass in the Ford tranny, although the thrust washers on the lower half may be. I'll have to check my transmission parts.

[Lauren Child]

Just to be clear, the old Hypoid 90 gear oil was required to be compatible with copper, where modern oils may not be.

It’s part of the specification in the Handbook of Service Lubricants March 1945.

As of the 1950s, Hypoid 90 or GO-90 becomes OEP-220 but is still required to have no delitirious effect on copper.

The spec for OEP 220 has apparently changed over time, and now says that it may not be suitable for use with copper alloys, even in a GL5 spec - https://www.dstan.mod.uk/StanMIS/Ind...945?seriesId=2

[leo tomaiolo]

on my 41 ford with the marmon herrington 4x4 i filled my drive line with modern GL-5 fluid. went out for a ride and the drive line was real noisy and the transfer case got real hot. checked the manual and it specified sae 140w GL-3. GL-3 is for mild extreme pressure. i was able to find it (Summit racing). the GL-3 lube made a huge difference in driveabilty. note the modern oil i originally used said it covered GL-3 but was EP. after looking in to it the modern oil did not have enough suspension (MEP vs EP) to stay in the void of the gears resulting in not enough oil cushion between the gears.

[Les Kovacs]

Hi Wayne & Rob.

Great post Wayne.....Rob sent me a similar explanation many months ago as I was looking for a suitable transmission/transfer case oil.

At the time I settled on Redline MT-90. It states that its....

•Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
•Recommended for GL-1, GL-3 and GL-4 applications, as well as where most special synchromesh fluids are specified.
•Satisfies the gear oil viscosity requirements of 75W90, 80W90, 90 and motor oil viscosities of SAE 40, 10W40 and 15W40

Unfortunately its $25.00 CAD/liter as it is a synthetic.....but shift feel is fantastic.

if you have found a cheaper, safe & local (Canadian sourced) alternative please let me know as its not stated in your post.

Regards to both...

lesk

[Alex van de Wetering]

EP doesn't necessarily mean it's not compatible with yellow metals! I recently bought "Penrite Mild EP Gear oil" for my Chev steering box. It's safe to use with yellow metals. The C8 steering box has a washer and a bushing in brass. The box still leaks though.....so I am now also looking at the 0 or 00 grease, which is what is used in hydraulic systems on trucks here.....I wonder, is it safe for use with yellow metals?

https://www.penriteoil.com.au/produc...ar-oil-sae-110

Alex

[Wayne Hingley]

Originally Posted by Alex van de Wetering

EP doesn't necessarily mean it's not compatible with yellow metals!

You are correct Alex. There are several specialty oils with EP additive packs that are yellow metal "friendly".

Les: I have decided to use Royal Purple MaxGear 75w90. It is available through Canadian Tire.

Below is some info from their website:
Max Gear is recommended for use in truck and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. It is non-corrosive to soft yellow metals (brass, bronze, copper, etc.) and synchronizer safe.

[Les Kovacs]

Thanks Wayne....its now a matter of price....if the Royal Purple product is cheaper than the Redline MT90 I will switch.

Regards,

lesk