The Ford Barn

jeepguy1948 · 01-11-2023, 12:08 PM

I know that lots of folks have their own opinions but I’m curious what y’all are using for gear oil. 90 wt and GL4 (that’s the hard part). Even after deciding what then you have to find it to buy it (supply chain blah, blah, blah).

cas3 · 01-11-2023, 01:45 PM

The O'riellys (?). near me always has 140wt GL4 on the shelf, and sometimes even 90wt, but usually I have them order it. Thats for the trans, I use anything in the diff

Ford Freak · 01-11-2023, 03:05 PM

I always use Sta-Lube 140wt. GL4 in trans. & rear axle. I get it from NAPA.
JD CornHead grease works good in the steering box to keep that from leaking.

aussie merc · 01-12-2023, 07:44 AM

GL4 140 is available here but has to be ordered generally takes 2 days. Has anyone got any information on GL6 spec and its suitability with yellow metals

rotorwrench · 01-12-2023, 11:01 AM

I use Aeroshell SAE-50/100 grade motor oil but without the Plus (TCP additive). SAE-50 motor oil is the same viscosity as SAE-90 gear lube. It is packaged as Aeroshell 100 or W100.
The 100 is straight mineral grade and the W100 is ashless dispersant additive which has detergent qualities to hold crud in suspension. I generally just use the mineral based oil but either will work in a transmission.

Use anything you want in the rear axle. There are no soft metals in there unless you have a old Model T.

jeepguy1948 · 01-12-2023, 12:00 PM

Sponsored Links (Register now to hide all advertisements)

Thanks Y’all, I got the StaLube from NAPA

KJ714 · 01-12-2023, 01:44 PM

I was just wondering the same thing, great resource

The Liberator · 01-15-2023, 02:05 AM

I’ve ran the “600wt” form any of the early parts suppliers with good luck but often wondered if any heavy gear lube would be the same? Much easier to run to Napa then order it.

jackson · 01-16-2023, 04:40 PM

For my '50 Merc Tranny and OD box I use NAPA GL-1.... it contains zero hypoid gear additives.

Brian · 01-17-2023, 06:21 PM

"Use anything you want in the rear axle. There are no soft metals in there unless you have a old Model T."

Or a Columbia!! Columbia's have yellow metal components, which may be compromised using GL5 additives?

Gene1949 · 01-18-2023, 10:11 AM

CRC Sta-Lube API/GL-4 Multi-Purpose Gear Oil 85W90, Sta-Lube, 1 Gallon, Hypoid Gear Oil, Yellow Metal Safe, Anti-Rust and Anti-Wear Ep Additives
Not to hijack but I changed out the GL-5 and used this in the Muncie in the Camaro. Huge difference (better) in the way it shifts. As soon as it warms up I'm going to do the T-10 in the '49. I believe the T-10 is the big brother to the 49-43 flathead trans, basically a bolt in.

Gene1949 · 01-18-2023, 10:15 AM

I think the additives in the Gl-5 do not play well with the old synchros shift quality. Just my opinion.

Tim Ayers · 01-18-2023, 01:07 PM

Quote:

Originally Posted by jeepguy1948

Thanks Y’all, I got the StaLube from NAPA

Excellent. Was going to say NAPA, but looks like you've already got it. NAPA is still a pretty good resource for these old Fords.

joe amorello · 01-18-2023, 04:39 PM

Sta lube trans and rearend

01-11-2023, 12:08 PM	#1
jeepguy1948 Senior Member Join Date: Jan 2022 Posts: 720	What Gear Oil I know that lots of folks have their own opinions but I’m curious what y’all are using for gear oil. 90 wt and GL4 (that’s the hard part). Even after deciding what then you have to find it to buy it (supply chain blah, blah, blah).

01-11-2023, 01:45 PM	#2
cas3 Senior Member Join Date: Jan 2011 Location: sw minnesota Posts: 4,572	Re: What Gear Oil The O'riellys (?). near me always has 140wt GL4 on the shelf, and sometimes even 90wt, but usually I have them order it. Thats for the trans, I use anything in the diff

01-11-2023, 03:05 PM	#3
Ford Freak Senior Member Join Date: Feb 2013 Location: Pittsford NY. USA Posts: 1,096	Re: What Gear Oil I always use Sta-Lube 140wt. GL4 in trans. & rear axle. I get it from NAPA. JD CornHead grease works good in the steering box to keep that from leaking. __________________ 1952 Ford F1 1965 Ford Falcon Sprint 2007 Ford Mustang GT

01-12-2023, 07:44 AM	#4
aussie merc Senior Member Join Date: Sep 2016 Location: sydney australia Posts: 1,033	Re: What Gear Oil GL4 140 is available here but has to be ordered generally takes 2 days. Has anyone got any information on GL6 spec and its suitability with yellow metals

01-12-2023, 11:01 AM	#5
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,426	Re: What Gear Oil I use Aeroshell SAE-50/100 grade motor oil but without the Plus (TCP additive). SAE-50 motor oil is the same viscosity as SAE-90 gear lube. It is packaged as Aeroshell 100 or W100. The 100 is straight mineral grade and the W100 is ashless dispersant additive which has detergent qualities to hold crud in suspension. I generally just use the mineral based oil but either will work in a transmission. Use anything you want in the rear axle. There are no soft metals in there unless you have a old Model T. Last edited by rotorwrench; 01-12-2023 at 04:05 PM.

01-12-2023, 12:00 PM	#6
jeepguy1948 Senior Member Join Date: Jan 2022 Posts: 720	Re: What Gear Oil Sponsored Links (Register now to hide all advertisements) Thanks Y’all, I got the StaLube from NAPA

01-12-2023, 01:44 PM	#7
KJ714 Member Join Date: Jul 2022 Posts: 46	Re: What Gear Oil I was just wondering the same thing, great resource

01-15-2023, 02:05 AM	#8
The Liberator Junior Member Join Date: Jan 2015 Location: Redwood City, CA Posts: 10	Re: What Gear Oil I’ve ran the “600wt” form any of the early parts suppliers with good luck but often wondered if any heavy gear lube would be the same? Much easier to run to Napa then order it.

01-16-2023, 04:40 PM	#9
jackson Member Join Date: Sep 2010 Location: Lincoln, Nebraska Posts: 54	Re: What Gear Oil For my '50 Merc Tranny and OD box I use NAPA GL-1.... it contains zero hypoid gear additives. __________________ 1950 Mercury mild custom. Original flathead, re-built, bored .040 over, Max-1 cam, Offy heads, Edelbrock super duel with Stromberg 48s.

01-17-2023, 06:21 PM	#10
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,833	Re: What Gear Oil "Use anything you want in the rear axle. There are no soft metals in there unless you have a old Model T." Or a Columbia!! Columbia's have yellow metal components, which may be compromised using GL5 additives? __________________ Unfortunately, two half wits don't make a whole wit!

01-18-2023, 10:11 AM	#11
Gene1949 Senior Member Join Date: Jun 2016 Location: Pahrump, NV Posts: 373	Re: What Gear Oil CRC Sta-Lube API/GL-4 Multi-Purpose Gear Oil 85W90, Sta-Lube, 1 Gallon, Hypoid Gear Oil, Yellow Metal Safe, Anti-Rust and Anti-Wear Ep Additives Not to hijack but I changed out the GL-5 and used this in the Muncie in the Camaro. Huge difference (better) in the way it shifts. As soon as it warms up I'm going to do the T-10 in the '49. I believe the T-10 is the big brother to the 49-43 flathead trans, basically a bolt in.

01-18-2023, 10:15 AM	#12
Gene1949 Senior Member Join Date: Jun 2016 Location: Pahrump, NV Posts: 373	Re: What Gear Oil I think the additives in the Gl-5 do not play well with the old synchros shift quality. Just my opinion.

01-18-2023, 04:39 PM	#14
joe amorello Junior Member Join Date: Mar 2015 Location: shrewsbury mass Posts: 10	Re: What Gear Oil Sta lube trans and rearend