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#1468675 Wed Sep 28 2022 04:47 PM
Joined: Sep 2013
Posts: 14
5
58n63 Offline OP
'Bolter
What is the proper type of gear lube for a 1963 C60 truck with a vacuum controlled 2 speed rear axle?

58n63 #1468749 Thu Sep 29 2022 02:22 AM
Joined: Dec 2018
Posts: 1,978
F
'Bolter
80/90 winter 140 summer or heavy work as much as they hold probably wont change very much

58n63 #1468806 Thu Sep 29 2022 03:44 PM
Joined: Sep 2013
Posts: 14
5
58n63 Offline OP
'Bolter
What about the type such as GL 4 or GL 5 or?

58n63 #1468830 Thu Sep 29 2022 06:50 PM
Joined: May 2015
Posts: 6,256
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Either would work. GL 4 is for synchro transmissions. I don't believe the 2 speed axles have synchronizers. If they do, that would be the only reason to avoid GL 5.


Kevin
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
#2 - '29 Ford pickup restored from the ground up.
First car '29 Ford Special Coupe
Busting rust since the mid-60's
Joined: Sep 2013
Posts: 14
5
58n63 Offline OP
'Bolter
Originally Posted by klhansen
Either would work. GL 4 is for synchro transmissions. I don't believe the 2 speed axles have synchronizers. If they do, that would be the only reason to avoid GL 5.

So what is it about GL 5 and synchronizers that is not compatible?

I have been using and maintaining my 1958 and my 1963 Chevy C60 trucks for over 50 years. I'm sure I have added GL 5 to the transmissions not knowing better. I believe it was on this forum quite some time ago where it was stated not to use GL 5 in transmissions. That is what prompted me to ask this initial question about the differential lube.

So what is it about GL 5 and synchronizers that is not compatible?

58n63 #1468994 Fri Sep 30 2022 05:26 PM
Joined: May 2015
Posts: 6,256
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Originally Posted by 58n63
So what is it about GL 5 and synchronizers that is not compatible?
GL 5 contains sulfur, which will attack the brass used in synchronizers.


Kevin
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
#2 - '29 Ford pickup restored from the ground up.
First car '29 Ford Special Coupe
Busting rust since the mid-60's
58n63 #1469365 Mon Oct 03 2022 12:23 PM
Joined: Dec 2018
Posts: 1,978
F
'Bolter
58n63 From what I could understand modern gear oil may be too slick to let the synchronizer rings get enough friction on the gear taper to work like they should,may grind on the way in. If the shift collar dogs have weak worn springs so they don't put enough tension on the synchronizer ring may grind. You sometimes feel the collar go past the synchonizer then if you don't go back to neutral will grind. Always happens up town where people will know you don't know how to shift it !! LOL

Joined: Mar 2004
Posts: 5,723
M
'Bolter
Originally Posted by fixite7
58n63 From what I could understand modern gear oil may be too slick to let the synchronizer rings get enough friction on the gear taper to work like they should,may grind on the way in. If the shift collar dogs have weak worn springs so they don't put enough tension on the synchronizer ring may grind. You sometimes feel the collar go past the synchonizer then if you don't go back to neutral will grind. Always happens up town where people will know you don't know how to shift it !! LOL

I believe the OP is asking about lube for his rear, not transmission...

Mike B smile

58n63 #1469839 Thu Oct 06 2022 04:32 AM
Joined: Sep 2011
Posts: 1,195
B
'Bolter
Manual states "16 pt SAE 90 "multi purpose" gear lube.
Made sure it is for hypoid axle.
I run 85W-140 hypoid gear lube.


BC
1960 Chevy C10 driver 261 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
Joined: Dec 2018
Posts: 1,978
F
'Bolter
MikeB Well your right kinda jumped the traces there,heard others mention synthetics on gear boxes. Changed my differential 14 pints it then pinion leaked till it got rid of enough is now OK at about i/2 inch below the plug cold.


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