transmission oil

[36 flathead]

I read somewhere to use gl4 oil in 36 transmissions, everything around here is gl5. I understand gl5 eats whit metal. any suggestions

[01aford]

It should be 140. Not even GL4. GL4 also has additives that messes up your bearings. GL5 is just double the additives as GL4.
I just found 5 gallons of 140 with no additions just like Henry used.
Good luck it was not expensive but hard to find. I got the last 5 gallons around me. It's appears like it's being phased out.

[4tl8ford]

Check this out: http://www.amref.com/CMSFiles/File/b...ar_Oils_PB.pdf

[36 flathead]

can't find 140 anywhere. looks like mobile 1 75w140 is compatable with white metal

[Bassman/NZ]

I have a 36 trans, and am getting close to the stage where I'm about ready to fill it for the first time. Anyone else got suggestions for this? Single weight 140 could be hard to find here, but is'nt that similar to the old Model A 600wt?

[Al NJ]

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I just picked up some Valvoline 85W-140. Is that okay to use?

The counter guy at my local NAPA didn't even think he could get straight 140.

[37 Coupe]

I use Sta-Lube GL-4 gear lube,in the transmission of my 37 Ford I use the SAE 85W/90, in the Columbia rear I use the straight 140W both I bought from NAPA,both say on the back Not corrosive to copper,bronze or other non ferrous metals to me those are yellow metals,not white as mentioned in another post.I have always believed that GL-4 was the one to use and not GL-5 but someone else has posted not to even use GL-4,but it has worked for me and after one change I sure did not see anything but gear lube I could have/should have put back in with no metal particles. CRC makes Sta-Lube, the part # for 85W/90 is SL24239 and for the 140W is SL24238. The 140W in transmission makes it little harder to shift when its a little cold out,but I prefer it in the Columbia all year as at least it stays in banjo better than the 85/90.