Which oil to use in a manual trans? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DuckhunterInTN · 10-05-2008, 10:01 AM

What type and weight of oil should I use in a 4 spd manual transmission on a 1967 Chevrolet C50? Thanks guys.

**WorkinLonghorn** · 10-05-2008, 10:20 AM

GM factory manual (series 10-60 MODELS) specifies

Quote:

"Multi-Purpose" gear lubricant meeting U.S. Army Ord. Spec. MIL-L-2105-B is recommended....

SAE 80 below 10 deg. SAE 90 up to 100,SAE140 above 100 consistantly.
I use 80/90 wt.

cdowns · 10-05-2008, 10:24 AM

75-90gear oil// same as used in rearends

Old Chevy Mech · 10-05-2008, 11:14 AM

I have been switching everything over to synthetic over the past 5 years. AMSOIL 75-90. I cant boast anthing except it shifted smoother right off the bat. Time will tell I'm sure.

Frank

**Tom Vogel** · 10-05-2008, 11:46 AM

This is interesting... I was going to use Royal Purple synthetic in my Tremec TKO... however even Tremec recomends GM Synchromesh.

so there you go.

newbraunie · 10-05-2008, 01:13 PM

API GL-5 gear oil covers MIL-L-2105-B specs. I use a 85-140W here in TX due to the heat.

Fred T · 10-05-2008, 01:34 PM

I've been running the 85W-140 to help slow down the leaks. Which tranny is in your C-50?

DuckhunterInTN · 10-06-2008, 09:13 AM

Quote:

Originally Posted by Fred T

I've been running the 85W-140 to help slow down the leaks. Which tranny is in your C-50?

I don't know, to tell you the truth. It is a 4-speed with a PTO. The gear pattern is 1 and 2 on the top and R, 3 , 4 on the bottom. It is behind a 292 inline 6. Does that help any?

10-05-2008, 10:01 AM	#1
DuckhunterInTN Registered User Join Date: Feb 2003 Location: Brownsville, TN Posts: 88	Which oil to use in a manual trans? What type and weight of oil should I use in a 4 spd manual transmission on a 1967 Chevrolet C50? Thanks guys. __________________ 2004 GMC 2500HD 4x4 Crew Cab Duramax 2000 Chevrolet ext-cab Z71 1995 Chevrolet ext-cab Z71 1984 Chevrolet K10 6.2 4x4 1972 GMC Jimmy 4x4 1967 Chevrolet C50 Dump truck 1957 GMC 1/2 ton stepside (not running)

10-05-2008, 10:24 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Which oil to use in a manual trans? 75-90gear oil// same as used in rearends __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-05-2008, 11:14 AM	#4
Old Chevy Mech Keepin it runnin! Join Date: Oct 2007 Location: Deep River, CT Posts: 1,036	Re: Which oil to use in a manual trans? I have been switching everything over to synthetic over the past 5 years. AMSOIL 75-90. I cant boast anthing except it shifted smoother right off the bat. Time will tell I'm sure. Frank __________________ 1970 K-5 4X4 Blazer 1970 K-20 4X4 Long Bed "Liberty Means Responsibility, that is why most men dread it"

10-05-2008, 11:46 AM	#5
Tom Vogel 2WD Jimmy Join Date: Mar 2005 Location: Davis County, Utah Posts: 2,565	Re: Which oil to use in a manual trans? This is interesting... I was going to use Royal Purple synthetic in my Tremec TKO... however even Tremec recomends GM Synchromesh. so there you go.

10-05-2008, 01:13 PM	#6
newbraunie Registered User Join Date: Aug 2008 Location: Central TX Posts: 393	Re: Which oil to use in a manual trans? API GL-5 gear oil covers MIL-L-2105-B specs. I use a 85-140W here in TX due to the heat.

10-05-2008, 01:34 PM	#7
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: Which oil to use in a manual trans? I've been running the 85W-140 to help slow down the leaks. Which tranny is in your C-50? __________________ Fred There is no such thing as too much cam...just not enough engine.



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