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41 Series 63 Manual Transmission Oil Question

Started by sethwick75, September 18, 2014, 04:53:34 PM

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sethwick75

September 18, 2014, 04:53:34 PM
I recently purchased a '41 Series 63 and was reading about what transmission fluid should be used in the manual transmission.  I am new to this vintage so am looking for guidance from someone as to which fluid I should fill it with after performing a flush.

Thanks

Seth Leishman

Steve Passmore

#1
September 18, 2014, 05:01:43 PM
Its gear oil in the manual transmission!
Steve

Present
1937 60 convertible coupe
1941 62 convertible coupe
1941 62 coupe

Previous
1936 70 Sport coupe
1937 85 series V12 sedan
1938 60 coupe
1938 50 coupe
1939 60S
1940 62 coupe
1941 62 convertible coupe x2
1941 61 coupe
1941 61 sedan x2
1941 62 sedan x2
1947 62 sedan
1959 62 coupe

sethwick75

#2
September 18, 2014, 05:03:29 PM
I read that there may be issues with using GL-5 type gear oil.  Is that true?  Should I be using GL-4 or even GL-3?

Jay Friedman

#3
September 18, 2014, 10:38:37 PM
Use 80W-90W gear oil that you can buy in quart bottles at gas stations and auto parts stores.
1949 Cadillac 6107 Club Coupe
1932 Ford V8 Phaeton (restored, not a rod).  Sold
Decatur, Georgia
CLC # 3210, since 1984
"If it won't work, get a bigger hammer."

TJ Hopland

#4
September 19, 2014, 12:21:24 AM
Its been a while since I have had to know about the GL oils.   From what I remember it had to do with whether or not the transmission had synchros or not and what type they were.   Some of them required special properties to work properly.   In theory you could have an oil that is 'too slippery' and won't let the synchos work. 

GL-5 has the highest concentration of Extreme Pressure additives which can be corrosive to 'yellow metals' which is usually a brass copper zinc alloy.   GL-4 has a much lower amount of EP so its usually safe to use in machines that have some 'yellow' parts.   GL-1 was the original oil with no EP stuff but I don't think they make it anymore, its generally replaced with GL4.   If you can't have any additives you have to look into other classes of lubricants which can get confusing. 
73 Eldo convert w/FiTech EFI, over 30 years of ownership and counting
Somewhat recently deceased daily drivers, 80 Eldo Diesel & 90 CDV
And other assorted stuff I keep buying for some reason

camelot

#5
September 19, 2014, 07:31:35 AM
When I got my car it shifted very hard. Had to double clutch. Changed to Stalube Gl4(n*p*a) and made a big difference. From what I've read, gl5 is not backwards compatable as they say. Just my experience.
1939 Cadillac 7519
1940 Lasalle 5019
1962 Cadillac 6339 4w

C.R. Patton II

#6
September 19, 2014, 12:30:13 PM


Hello Seth

Welcome to the Cadillac & LaSalle Club Forum!

Gratulantur on your acquisition.  Your 1941 Cadillac 6319 is beautiful and rare.  Only 5,050 manufactured with just 27 listed in our 2014 CLC International Membership Directory.

I would like you to consider joining our CLC National organization and a region near your residence to enjoy the all the benefits of membership.
All good men own a Cadillac but great gentlemen drive a LaSalle. That is the consequence of success.
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