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Proper oil for 49 Chevy 4 speed
#1359588 Sun May 10 2020 05:22 PM
Joined: Sep 2019
Posts: 12
T
TKM Offline OP
New Guy
Can anyone tell me what is the proper transmission oil for my 1949 Chevy 3600 four-speed? Also, transmission seems to work well but the gearshift is very sloppy. Are there any rebuild kits that can address the sloppiness? Thanks! Tim

Re: Proper oil for 49 Chevy 4 speed
TKM #1359652 Sun May 10 2020 09:12 PM
Joined: Aug 2018
Posts: 219
D
Shop Shark
The '48-'51 Chevy Truck Shop Manual [chevy.oldcarmanualproject.com] lists on page 0-5 the recommended lubricant as 90 wt. I prefer Red Line Oil MT-90, as it is synchronizer friendly, and works well in older transmissions.

Others can probably help better than I on the questions regarding shifter sloppiness.

Doug

Last edited by drdoug; Sun May 10 2020 09:12 PM.
Re: Proper oil for 49 Chevy 4 speed
TKM #1359657 Sun May 10 2020 09:44 PM
Joined: Sep 2001
Posts: 30,131
ace skiver
From Novak's website [novak-adapt.com]:

"When filling your 420 with gear oil, we recommend that you select a conventional mineral oil or a para-synthetic in lieu of a full synthetic oil. Properly assembled manual gearboxes do not have the thermal strains seen by combustion engines or hypoid gears. Synthetic fluid in these gearboxes, while not harmful, is probably an economic waste.

Hypoid gear oil is sulphurized higher than transmission oil and can be mildly corrosive to the non-ferrous alloys used for synchros, bushings and thrust washers in these transmissions.

An 80W-90, API-GL5 or MT-1 rated fluid is very good. Some claim faster shifts from using a 50W engine oil in their transmission and we do not consider this to be contraindicated unless you operate your vehicle in a very warm environment."


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Proper oil for 49 Chevy 4 speed
TKM #1359667 Sun May 10 2020 10:23 PM
Joined: Sep 2019
Posts: 12
T
TKM Offline OP
New Guy
Hey guys, thanks so much for your help and advice, always like to hear from those with experience !

Re: Proper oil for 49 Chevy 4 speed
TKM #1359668 Sun May 10 2020 10:33 PM
Joined: Jul 2014
Posts: 584
D
Shop Shark
Previous posts have recommended - Traveller Ford Tractor All Mineral 90 Transmission Fluid, 2 gal.
SKU: 80660099 at Tractor Supply. $23.

Last edited by Dusty53; Sun May 10 2020 10:34 PM. Reason: corrected text

Ronnie
1954 Chevy 3604 - A work in progress...

" You can't keep dancing with the Devil and wonder why you're still in hell"
Re: Proper oil for 49 Chevy 4 speed
TKM #1359693 Mon May 11 2020 01:16 AM
Joined: Aug 2018
Posts: 219
D
Shop Shark
Tim, I have to respectfully disagree with the recommendation of using GL-5 fluids for transmissions. The added Sulphur needed to make the GL-5 rating is generally corrosive to synchronizers, and any brass/bronze components, and not needed for other than hypoid rear ends and similar. A good GL-4 fluid is sufficient and synchronizer friendly. Further, fluids that are properly designed for transmission use have the right characteristics that promote smooth shifts. A typical GL-5 gear lube that is great for rear ends doesn't necessarily meet that, either.

Now, I'm not pushing the brand, as there are many choices, but here is a good white paper on the subject, FYI. Red Line MTL and MT-90 Tech Info [redlineoil.com].

Cheers!

Doug

Last edited by drdoug; Mon May 11 2020 01:17 AM.
Re: Proper oil for 49 Chevy 4 speed
TKM #1359704 Mon May 11 2020 01:55 AM
Joined: Sep 2019
Posts: 12
T
TKM Offline OP
New Guy
Doug, I will check out the article, thanks so much for taking time to help, I’m amazed at all the knowledge on this site !!


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