The Ford Barn

37FordPickupTucson · 01-04-2018, 05:12 PM

What oil do y'all recommend for the transmission and differential in my '37 pickup? I never knew that some gear lubes could attack bronze and brass parts.

V8COOPMAN · 01-04-2018, 05:21 PM

Something labeled "GL4" to save the brass synchros in the trans. Works fine in the rear, also. DD

Juergen · 01-05-2018, 08:27 AM

Need to avoid GL-5. Both O'Reilley and Advance Auto have trans oil labeled for synchromesh transmissions. I used one from Pennzoil labeled Synchromesh. It is said to be for Chrysler and GM transmissions and meets API GL-3 performance.

rotorwrench · 01-05-2018, 09:49 AM

The real axle can use about any common gear lubricant. The transmission should have mild EP due to all the bushings, thrust washer, and blocker rings made of what is referred to as yellow metals. GL-4 rated is the easiest to get in the lower EP range. GL-3 is what was used back in the day and GL-4 is the modern replacement. Truth be known, you can run SAE 50 motor oil in a transmission since it has the same basic viscosity as SAE 90 gear lube.

Drbrown · 01-05-2018, 10:43 AM

GL-4 for sure. I use StaLube 140 in rear and their 85-90 for tranny to help sincros shift smoother in cold weather. I also use the 85-90 in my fan hub. Although available at my local NAPA, I buy both from Amazon; better price and free shipping.

19Fordy · 01-05-2018, 11:25 AM

Sponsored Links (Register now to hide all advertisements)

I use 140 Stalube in both transmission and rear of 40 Ford.
http://www.crcindustries.com/product...l-SL24238.html

01-04-2018, 05:12 PM	#1
37FordPickupTucson Junior Member Join Date: Nov 2017 Posts: 7	'37 trans and diff oil? What oil do y'all recommend for the transmission and differential in my '37 pickup? I never knew that some gear lubes could attack bronze and brass parts.

01-04-2018, 05:21 PM	#2
V8COOPMAN Senior Member Join Date: May 2010 Location: East Shore of LAKE HOUSTON Posts: 11,115	Re: '37 trans and diff oil? Something labeled "GL4" to save the brass synchros in the trans. Works fine in the rear, also. DD __________________ *Click Links Below* __ ▼ *'35-'36 W/8BA & MECHANICAL FAN* *T5 W/TORQUE TUBE*

01-05-2018, 08:27 AM	#3
Juergen Senior Member Join Date: May 2010 Posts: 503	Re: '37 trans and diff oil? Need to avoid GL-5. Both O'Reilley and Advance Auto have trans oil labeled for synchromesh transmissions. I used one from Pennzoil labeled Synchromesh. It is said to be for Chrysler and GM transmissions and meets API GL-3 performance.

01-05-2018, 09:49 AM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: '37 trans and diff oil? The real axle can use about any common gear lubricant. The transmission should have mild EP due to all the bushings, thrust washer, and blocker rings made of what is referred to as yellow metals. GL-4 rated is the easiest to get in the lower EP range. GL-3 is what was used back in the day and GL-4 is the modern replacement. Truth be known, you can run SAE 50 motor oil in a transmission since it has the same basic viscosity as SAE 90 gear lube.

01-05-2018, 10:43 AM	#5
Drbrown Senior Member Join Date: Oct 2013 Location: Glens Falls NY Posts: 1,267	Re: '37 trans and diff oil? GL-4 for sure. I use StaLube 140 in rear and their 85-90 for tranny to help sincros shift smoother in cold weather. I also use the 85-90 in my fan hub. Although available at my local NAPA, I buy both from Amazon; better price and free shipping.

01-05-2018, 11:25 AM	#6
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,950	Re: '37 trans and diff oil? Sponsored Links (Register now to hide all advertisements) I use 140 Stalube in both transmission and rear of 40 Ford. http://www.crcindustries.com/product...l-SL24238.html