![]() |
![]() |
#1 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
SM 465 gear oil help
Looking to replace the gear oil in my 4 speed 68 but I’ve been reading not to use gl5, only 4, but it seems difficult to locate.
Hoping I can get some guidance on what to use Thanks |
![]() |
![]() |
![]() |
#2 |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,538
|
Re: SM 465 gear oil help
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Jul 2021
Location: Tioga Pennsylvania
Posts: 28
|
Re: SM 465 gear oil help
Yep Lucas oil has it
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
Re: SM 465 gear oil help
The Lucas I’ve seen is gl5 rated and in my research it seems it’s had some issues with my type of transmission and the softer metals….
Is this a valid concern, or am I maybe reading too much into it and Gl5 products will work just fine? |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
Re: SM 465 gear oil help
Was thinking of giving this a shot.
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,508
|
Re: SM 465 gear oil help
Sta-lube
NAPA carries it
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
Re: SM 465 gear oil help
Tried looking for that sta-lube but seems to be on back order at a lot of places, including my Napa and online
|
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jul 2021
Location: Tioga Pennsylvania
Posts: 28
|
Re: SM 465 gear oil help
Crap I misspoke. I purchased VP racing GL4 not Lucas. Here is the link.
https://vpracingfuels.com/product/vp...80w-90/?c=394& |
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,442
|
Re: SM 465 gear oil help
GL5 is better than GL4 for gears in the rear end, but GL5 is bad for the brass syncros in the manual transmission. That doesn't mean GL-4/5.
Look for Sta-Lube GL-4 or Valvoline GL-4. Those are the ones I am usually able to find.
__________________
'67 GMC 2500, 292, 4spd, AC |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,508
|
Re: SM 465 gear oil help
Didn’t see it was on back order why not use Valvoline 80-90 it’s GL 4 my local Autozone has it in stock for pickup today @ 33.99 a gallon
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
![]() |
![]() |
![]() |
#11 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,166
|
Re: SM 465 gear oil help
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
Re: SM 465 gear oil help
Thanks everyone
|
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,508
|
Re: SM 465 gear oil help
From Valvolines website says it for non synchronized transmissions
https://shop.valvolineglobal.com/pro...oil-sae-80w-90
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
![]() |
![]() |
![]() |
#14 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,508
|
Re: SM 465 gear oil help
Clear as mud CRC /Stay-lubes site
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
Re: SM 465 gear oil help
Anyone see any red flags with the triax I ordered on Amazon? Can always return and get something else.
GL4 and seems to be for synchronized… https://www.amazon.com/Synthetic-Shi...ws_feature_div |
![]() |
![]() |
![]() |
#16 |
Senior Member
![]() Join Date: Feb 2022
Location: Ca
Posts: 517
|
Re: SM 465 gear oil help
I am not familiar with what you choose. A little late to the party. I ran a Jerico dog box in a road race application about 12 years. Refreshed every 2 years and oil changed at about 3 to 5 hours use.. Should have been more often but $$ always an issue. I experimented with 4 different oils. All 75-90. Thicker will affect you shift speed and ease of engagement, very critical for my use. Royal Purple was black. I did not like the results and feel it is a marketing product over real world result. Red line has a product that claims it fights gear crash. I bit, given critical for dog ring syncos It was ****. Mobil One performed quite well and price is decent. Hands down the oil that performed the best was Valvoline. It comes out as gold as it goes in. I use 75-140 in the diff. I do not have a cooler on the diff. It is a clutch style with ramps for the spider gears to walk on and tighten as torque is applied. Great for loosening in a corner, slipping the 5 clutches and then tightening down on corner exit. This allowed rotation in the corner and lock the differential on excelleration down the straight away. Lots of heat. The Valvoline 75-140 would pour in gold and out nearly the same color. I ripped a bunch of teeth off, and twisted splines but never a oil or heat failure. So Valvoline is my go to brand in all 4 of my cars and truck.
|
![]() |
![]() |
![]() |
#17 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,170
|
Re: SM 465 gear oil help
My brother sent me a link to this Site Years ago.
This has lots of Information/Opinions about oil. ![]() You have to Weed thru it though. ![]() Link: https://bobistheoilguy.com/forums/ Also this link: https://www.tractorbynet.com/forums/...shings.145754/ The 90 weight oil was safe for Bronze and (Yellow metals) years ago when these trucks was in there 20's. ![]() This new oil. ![]() ![]() Can you go Wrong with Syntetic or GL -12345? If you keep these transmissions filled with some oil that, Doesnt leak out faster that you fill it they will be okay. ![]()
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
![]() |
![]() |
![]() |
#18 |
Registered User
![]() Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,021
|
Re: SM 465 gear oil help
If you haven't made up your mind yet Amsoil offers 75W90 for manual transmissions, meets GL-4 rating and protects brass synchros. Its what I run in my 4-speeds too.
https://www.amsoil.com/p/amsoil-75w-...gear-lube-mtg/
__________________
'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
![]() |
![]() |
![]() |
#19 | |
Senior Member
![]() Join Date: May 2012
Location: Scottsdale, AZ
Posts: 1,906
|
Re: SM 465 gear oil help
Quote:
Though I have 3 or 4 gallons of Sta-Lube GL4 on my shelf, If I did not, and with it being such a hassle to get GL4... I would just go with GL5 and be done with it. My two cents. Good luck! ![]() j
__________________
White K20 |
|
![]() |
![]() |
![]() |
#20 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
Re: SM 465 gear oil help
Nobody has stated if they see any red flags with the one I bought, so I’m gonna be the test dummy and report back.
I appreciate all of the other info and recommendations. |
![]() |
![]() |
![]() |
#21 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,396
|
Re: SM 465 gear oil help
I run GL5 in mine and have never had a problem.
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's |
![]() |
![]() |
![]() |
#22 |
Senior Member
![]() Join Date: Aug 2005
Location: Los Angeles
Posts: 1,333
|
Re: SM 465 gear oil help
The issue with GL-5 is that many GL-5 products have sulphur in them. The sulphur is to protect hypoid ring and pinion gears from scuffing wear, just as motor oil back in the day had sulphur in it to protect flat tappet lifters and camshafts. Same kind of wear. Sulphur however is corrosive to brass and other non-ferrous metals commonly used in some manual transmission synchonizers. That's why most manual transmission specified GL-4 because GL-4 does not have sulpher in it.
__________________
1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. Last edited by Bob B.; 02-07-2024 at 05:58 PM. |
![]() |
![]() |
![]() |
#23 | |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,538
|
Re: SM 465 gear oil help
Quote:
I have been using Lucas Full Synthetic Gear Oil in all of my rear ends and manual transmissions practically since it came out with never a hint of a problem, superb performance. Common to all synthetics that claim no posi additives required... I will call B.S. on that in my personal experience, I always add a tube and I have found the MOPAR to be the best. |
|
![]() |
![]() |
![]() |
#24 |
Registered User
Join Date: Apr 2007
Location: la
Posts: 369
|
Re: SM 465 gear oil help
Just circling back to say the on I posted and bought has been working great!
|
![]() |
![]() |
![]() |
#25 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,170
|
Re: SM 465 gear oil help
Response of Results is Always a Good Thing.
![]() ![]() ![]() ![]()
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
![]() |
![]() |
![]() |
Bookmarks |
|
|