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#1320292 Sat Aug 03 2019 05:22 PM
Joined: Oct 2006
Posts: 1,851
B
Shop Shark
Just curious on thoughts of using 75W -90 oil in my transmission/rear axle, that way I can just keep one oil and pump on hand for the truck and my new car. I do know I used 80W-90 in a new car once, and it did not work very well....

brokenhead #1320293 Sat Aug 03 2019 05:40 PM
Joined: Sep 2001
Posts: 31,613
Bubba - Curmudgeon
What year/type transmission/rear-axle?


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]
brokenhead #1320294 Sat Aug 03 2019 05:45 PM
Joined: Oct 2006
Posts: 1,851
B
Shop Shark
53 3100 with original 3 speed and torque tube rearend.

brokenhead #1320375 Sun Aug 04 2019 02:25 PM
Joined: Jan 2001
Posts: 5,226
P
'Bolter
I really think too much can be made of oil viscosity.
Years ago my wife's Honda called for 10w-40 in the transaxle.
One of my customers had a 1960 Benz and it called for ATF in the manual transmission.
I think the only risk of using lighter oil is the potential of increased leakage.


See the USA in your vintage Chevrolet!
My Blog [chev235guy.blogspot.com]
brokenhead #1320383 Sun Aug 04 2019 04:00 PM
Joined: Jun 2004
Posts: 8,551
W
'Bolter
I would use 85-140 in the old truck trans. & rear end. In the new car use what the owners manual calls for. In the new car you don't change it often enough that the plastic squirt containers won't work.
George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
brokenhead #1320389 Sun Aug 04 2019 04:42 PM
Joined: Oct 2006
Posts: 1,851
B
Shop Shark
I was kind of thinking it would be fine, I just mentioned the new car because I used 80-90 non synthetic, and it didn't shift real well, I put the 75-90 synthetic in and it worked flawlessly. There is simply no way to utilize the squirt bottle to fill the new car, the hole is simply buried. I change the oil often enough I want a real genuine industrial oil pump, I have about 6 of those cheap little plastic pumps all broken to some extent or another, I swap parts around till I get one to work. One of them didn't even get one stroke, I pushed it down and the bottom blew off. Right out of the box. I'm so done with them..... But thanks for

brokenhead #1320390 Sun Aug 04 2019 04:43 PM
Joined: Oct 2006
Posts: 1,851
B
Shop Shark
I was kind of thinking it would be fine, I just mentioned the new car because I used 80-90 non synthetic, and it didn't shift real well, I put the 75-90 synthetic in and it worked flawlessly. There is simply no way to utilize the squirt bottle to fill the new car, the hole is simply buried. I change the oil often enough I want a real genuine industrial oil pump, I have about 6 of those cheap little plastic pumps all broken to some extent or another, I swap parts around till I get one to work. One of them didn't even get one stroke, I pushed it down and the bottom blew off. Right out of the box. I'm so done with them..... But thanks for the input.

brokenhead #1320455 Sun Aug 04 2019 11:46 PM
Joined: Feb 2004
Posts: 24,758
H
Kettle Custodian (pot stirrer)
Get accustomed to grinding gears, especially on downshifts. Synthetic gear lube is too slippery to let the synchronizers do their job with the heavy gears and the inertia involved with stovebolt transmissions- - - -SM-420's in particular. Use 90 weight straight mineral oil in the transmissions, 90 Hypoid lube in the rear end.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway

WAG MORE- - - - - -BARK LESS!
brokenhead #1320466 Mon Aug 05 2019 12:33 AM
Joined: Sep 2001
Posts: 31,613
Bubba - Curmudgeon


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]

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