03-19-2022, 05:05 PM
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#1 |
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Junior Member
Join Date: Nov 2016
Posts: 15
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GL4 or GL5
I am looking for the proper gear lube for a 1934-5 one and a half ton truck 4 speed transmission. It doesn't have synchros. I have been told I have to use GL4 gear lube but it's have proven difficult to find. Can I use GL5 in this trans or are there outer "yellow metals" in it that would be damaged by GL5?
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03-19-2022, 05:18 PM
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#2 |
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Senior Member
Join Date: Oct 2011
Location: Shelton, WA
Posts: 3,800
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Re: GL4 or GL5
NO synchros = no brass so you can use GL5 in it if you want. The 4 has a weaker additive that doesn't harm brass like the 5 will. For the cars 5 in the rear end 4 in the trans. That is my undedrstanding.
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03-19-2022, 07:48 PM
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#3 |
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Senior Member
Join Date: May 2010
Location: Oregon
Posts: 5,966
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Re: GL4 or GL5
Maybe the reverse idler runs with a yellow metal bushing.
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03-20-2022, 07:34 AM
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#4 |
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Senior Member
Join Date: May 2010
Location: Rochester, Il
Posts: 599
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Re: GL4 or GL5
O’Reilly’s sells MasterPro GL4 SAE 140 in gallons. Cheaper than name brands on Amazon too. Stu
__________________
Stu McMillan Marmon-Herringtons |
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03-20-2022, 07:44 AM
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#5 |
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Senior Member
Join Date: May 2010
Location: NJ
Posts: 6,181
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Re: GL4 or GL5
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