The Studebaker shop manual says to use SAE 80 mineral oil in the 4 speed trans of my 63 G.T. Hawk, can't find that around here. What else can be used?[?]
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Standard manual transmission 85W-90 GL-4 Gear oil, I like Sta-Lube.
StudeRich
Studebakers Northwest
Ferndale, WAStudeRich
Second Generation Stude Driver,
Proud '54 Starliner Owner
SDC Member Since 1967 -
According to the manual, there are bronze bushings for the reverse idler shaft in the 4-speed transmission. There may be more bronze parts. I thought that I had read that any of the gear oils past GL-1 contained "high pressure" lubricants that eat up brass and bronze parts. In that case, either find a GL-1 rated oil (perhaps at your farm supply store for hydraulic components on tractors)or something like Pennzoil "Synchromesh" gear fluid rated for transmissions with yellow-metal parts. Another option is 40 weight non-detergent motor oil, which actually has the same viscosity as 80 weight gear oil.
[img=left]http://www.studegarage.com/images/gary_ash_m5_sm.jpg[/img=left] Gary Ash
Dartmouth, Mass.
'48 M5
'65 Wagonaire Commander
'63 Wagonaire Standard
web site at http://www.studegarage.comGary Ash
Dartmouth, Mass.
'32 Indy car replica (in progress)
’41 Commander Land Cruiser
'48 M5
'65 Wagonaire Commander
'63 Wagonaire Standard
web site at http://www.studegarage.comComment
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This same issue has come up with Volkswagens as the same issue exists with those transaxles. The consensus there seems to be that a GL-4 is OK while a GL-5 is not. Redline gear oils are GL-4 rated and I've had good luck with them. I know plenty of people who have gone ahead and run GL-5 without issues, but I can't wholeheartedly recommend that.
On my '62 hardtop I used Redline MT-90 and the shifting was great; in the '55 I used Heavy Shockproof gear oil on Ted H's recommendation and the shifting isn't quite as butter-like but I can't say whether that is due to the heavier oil or the fact that the '62 had 25K original miles and the '55 has a 4-speed that I think was in the trunk of some car that JP bought
nate
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55 Commander Starlight
http://members.cox.net/njnagel--
55 Commander Starlight
http://members.cox.net/njnagelComment
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As Nate says, MT-90 works great. It's been in the car below for many years...shifts smooth and easy. Yes thicker oil will deffinately make the shifting stiffer (especially in cold weather). Hope this helps.
Dan Miller
Atlanta, GA
[img=left]http://static.flickr.com/57/228744729_7aff5f0118_m.jpg[/img=left]
Road Racers turn left AND right.Comment
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Thanks for the helpComment
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