GL-4 gear lube

Thanks. I have read that before.

I was curious as to any normal parts suppliers stocking any kind of GL-4.

My nearest speed shop is 40 miles away. They have Amsoil and Redline.

Was kind of hoping to find out that NAPA or Carquest offered it.

Thanks.

Aaron...Where do you live? I just bought a case of the Penzoil GL-4 and don't need all of it. If you are close, stop over and I will give you a bottle of it. I am in Flint Michigan.
I checked all of the local parts places around here. None carry it. The local GM Dealer does, at 9.00 for a 16 oz bottle.

I had an issue finding it, but with some effort it can be ordered in.
Online: Sta-Lube by CRC #SL24229 3 days shiped to my door.
GM Dealership: #89021671 3-10 days (depended on the dealership), pick up
Local parts house: Pennzoil Gearplus GL-4 #21176, 2 days, pick up. Cheapest price. Bought a case.
I think I'll be in a home before I go thru all of this...

Thanks Tony, but I'm in Florida. I guess I will have to buy some online or visit the speed shop next time I'm in town.

Did yall just do a goggle search for it?

Looks like I will be looking for a suction pump also.

I think napa carries sta lube that's gl4 rated.

Fabio is correct some NAPA stores stock CRC sta lube gl-4 rated 80w-90 lube and if they dont stock it they can get it the next day for you.

I have the sta lube in my m20 muncie.

Scott

Thanks

Scott

I'll check with NAPA.

Scott

I went to NAPA today. Looked for the product needed. All the gear oil they had were Royal Purple, NAPA, Valvoline (convential) and Synpower. They also had CRC sta lube, but it was a synthetic, not sure if it was GL-4 rated.

All of the oils were rated for GL-5. One was rated for GL-3, GL-4, GL-5. NAPA man assured me that this one (Valvoline) brand would be OK. I questioned him and told him of the situtation. He called a Valvoline tech and let me talk to him. Valvoline man told me that one was "OK" for the Munice. He specifically mentioned that it was OK for yellow metals.

I'm confused now. I did not buy anything, decided to post here what happend and see the reaction.

What is going on? I believed I was OK before going in, but now I'm don't know what to believe.

I ran mobil one synthetic 75-90w in my muncie and the thing would grind when going into 2nd, or 3rd. Note I had some regular valvoline that was gl4/gl5 rated that replaced the mobil that really helped the grinding. I called up a guy that's been building these muncies for 20 yrs and he suggested torco that rated gl6. Stating that higher the gl number the better the oil. As you can see everybody has a different opinion on this subject so I'm just sticking with gl4 rated oil like the tranny was intended to use.

Aaron,GL-5 LUBE CAN ATTACK THE YELLOW METALS OF THE SYNCROS OVER LONG PERIDS OF TIME IN A MUNCIE SO DONT USE GL-5 LUBE IMHO.

This is not comming from me,this is comming from the oil engineers @ Redline,Pennzoil,etc,check out some of the info i got on trans lube that i posted here in t/c in the recent past listed below.

BTW,the guy @ Napa you spoke to didnt know what he was doing,i know people that have odered CRC Sta Lube gl4- 80w-90 from Napa & recieved it in 1 day. The valvoline tech doesnt know what the problem is either with the harsh additives in the gl-5 lube being corrosive to the yellopow metals use to make the syncros in muncies.

1st here is a little of my experience with gl-5 lube in my muncie along with the info i got from Redline & other oil mfg's list below that.

I was not aware the GL5 & Hypoid additives that contains sulphur & is very slick was harmfull to the syncros in our muncie's that are rated for GL4 80/90 LUBE ONLY. I was unknowingly running GL5 lube in my muncie for 4+ yrs and it has been shifting harder even though clutch is adj correctly. Now i know why after reading the info from the Redline Oil Site which i have LISTED BELOW FOR YOU ALL TO READ TO AVOID DAMAGE TO YOUR MUNCIE'S.

Also,i checked approx 9 auto parts stores in my area and not one of them sells or stocks any 80/90 std trans lube that not rated for GL5/Hypoid,they are all rated for GL5/hypoid use . None of the 9 stores i checked stock the lower rated GL4 80/90 lube thats rated for our older muncie std trans so beware of this as i am sure many of you are running the wrong GL5 rated lube that will eventually tear up your syncro's AND DONT EVEN KNOW IT'S HAPPENING.

I just drilled and tapped my muncie for a drain plug so i could drain the wrong GL5 lube out and replaced it with redilnes MT-90 gearlube thats specifically desigend for our trans but i think it's too late for me but i hope i can save some of your trany's if you take the time to read this great info from Redline oils listed below.

But my trans did shift better/smoother after i dunmped the too slippery & corrosive gl-5 lube and installed the correct for muncie gl-4 lube thats less slick & has the correct coefficient of friction for proper syncro operation.

SO READ THE INFO I HAVE LISTED BELOW FROM THE REDLINE OIL & and some info from Pennzoil too,i hope this helps you out.

Scott
========================================================

This is from Redline :

REDLINE Synthetic Manual Transmission Lubricants

GEAR AND SYNCHRONIZER WEAR PROTECTION
Most manufacturers of manual transmissions and
transaxles recommend an 80W or 90W GL-4 lubricant.
GL-5 gears oils which are required in hypoid differentials
are not used in most synchromesh transmissions
because the chemicals used to provide the extreme
pressure protection "can be corrosive to synchronizers"
which are commonly made of brass or bronze. Typically,
the use of a GL-5 lubricant in a synchromesh
transmission will "shorten the synchronizer life by one
half". The extreme pressure requirements of spur gears
and helical gears found in transmissions are not nearly
as great as found in rear-wheel drive differentials. A
GL-4 lubricant provides adequate protection for most
manual transmissions, unless a unique design
consideration requires the extra protection of a GL-5.
The reason that many manufacturers have made
recommendations of motor oils or ATFs is that petroleum
80W gear oils frequently do not shift well at low
temperatures. Motor oils and ATFs are much more fluid
at lower temperatures and they are not corrosive toward
synchros, but they provide very poor gear protection.
These lubricants provide almost no extreme-pressure
protection. In addition, petroleum multigrade motor oils
and ATFs have very poor shear stability. The shearing
action by a manual transmission on thickeners is much
worse than in an engine or automatic transmission.
Within 5,000 miles the thickeners can be rendered
ineffective and the transmission will be operating on a
much reduced level of protection, as shown in the graph
below. In hot weather these transmissions will whine
and rattle because of poor vibration dampening and
metal contact. Red Line MTL and MT-90 provide the
excellent gear protection of a GL-4 gear oil in a synthetic
lubricant which spans hot and cold temperatures and will
not shear or oxidize with use.

DIRECTIONS FOR USE
Red Line MTL may be used in transmissions which
recommend 75W, 80W, or 85W GL-4 gear oils, or SAE
30 or 5W/10W30 motor oils. If a 90W GL-4 or SAE 40,
10W40, or 15W40 is required, MT-90 may be used. If the
transmission or transaxle requires an SAE 90 GL-5 gear
oil, then Red Line 75W90NS or 75W140NS Gear Oil
may be used. In transmissions which recommend Dexron
or Mercon fluids we recommend our D4 ATF which is
very similar to the MTL, being a GL-4 Gear Oil also. The
D4 ATF will provide better low-temperature shiftability,
and the MTL would provide better wear protection for
racing use. MTL is not designed for use in rear-wheel
drive differentials. Those generally require a GL-5 lubricant
such as Red Line 75W90 Gear Oil. It is not necessary
to flush the transmission before replacing with MTL.
Remove the drain plug and drain while warm. Seal
compatibility has been designed to be similar to petroleum
lubricants, and leakage should be no greater than
any other oil of comparable viscosity. Being formulated
with extremely stable synthetic basestocks, MTL and
MT-90 will last much longer than conventional petroleum
lubricants. However, we do not recommend extended
drain intervals, since without a filtration system, there is
no way to remove metal shavings other than draining the
lubricant. The regular maintenance intervals are also
recommended to insure that the proper level of the fluid
is maintained.


Red Line Oil's MTL and MT-90 are designed to provide excellent protection and improved shiftability for manual transmissions and transaxles, having cured the problem of hard shifting in thousands of transmissions with shifting troubles. How? They have the appropriate coefficient of friction for most manual transmission synchronizers (many gear oils, engine oils, and ATFs are too slippery for proper synchro engagement). And, the wide viscosity of MTL and MT-90 allow proper shifting over the entire temperature range which the transmission will experience. The synthetic base oils used have a very high viscosity index which provides relatively constant viscosity as temperature changes. MTL is a low 70W at very low temperatures and a high 80W, nearly an 85W, at elevated temperatures, providing adequate viscosity to prevent wear and deaden gear noise. MT-90 is a thicker 75W90 version of MTL. The shear stability and oxidation stability of these products are excellent, thus the physical characteristics of Red Line MTL and MT-90 will change little with use.

MTL
MT-90

The MT-90 is a 75W90 GL-4 Gear Oil that’s slightly heavier than MTL. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.


RED LINE SYNTHETIC OIL CORP.
6100 Egret Court
Benicia, CA 94510
(707) 745-6100
www.redlineoil.com

NOTE: AMSOIL ALSO OFFERS A 75W-90 SYNTHETIC GEAR LUBE FOR MUSCLE CAR/MUNCIE MAN TRANS.

http://www.amsoil.com/StoreFront/mtg.aspx

GL-4 80W-90 TRANS LUBE FOR MUNCIE /SEE BELOW FOR INFO & WEBSITE.
========================================================
Also found a place to get the STA API/GL4 gear oil. Less than $20 delivered to my door for 2 qts. Have you heard anything about this oil? Thanks, Jim

STALUBE WEBSITE:

www.doityourself.com/invt/6844120

32Oz 85W90 Sta-Lube Gear Oil
**
Product Description
Gear Oil Multipurpose - Hypoid 90 Api/Gl-4 ``Sta-Lube`` Quart Bottle Weight=Sae 85W90
Low pour points and high temperature properties to provide lubrication over a wide temperature range. Versatile, contains anti-rust and anti-wear EP additives to provide corrosion protection in drives and hypoid gears. Dark oily substance with faint petro leum odor. Plastic-safe.
Product Details


Price From:
$5.90
Manufacturer:
Crc Industries
Model Number:
SL24229
UPC Number:
072213242294


Where to Buy

HardwareAndTools.com
Price From: $5.90
=========================================================

GM Dealers can also get you gl-4 rated gear lube.

=========================================================

PENNZOIL "SYNCROMESH GEAR OIL" /NOT GOOD FOR MUNCIES PER PENNZOIL ENGINEER/SEE BELOW:

Good morning, just spoke to the pennzoil tech dept, they said do NOT use the penn synchromesh lube in a muncie, it's a 5w20 and way, way, to light.

PENNZOIL also said "do NOT use a GL5 it will trash the bronze metals" in muncies used for syncros. They said the their GL4 product can generally be bought in a 35LB pail.
Jim

Scott

Thanks for the post.

I'm going to go ahead and order some of that lube over the internet.

I'm going to print this out and take it back to the man at NAPA. Great guy. Just needs to get this info out there.

Thanks.

what weight is required for these muncies?
Jegs sells red line
mt-90 =$8.99 part # 816-50304
mtl =$9.99 part# 816-50204

FABIO,either one from redline is ok,if your trans has never been rblt go with the slightly thicker MT-90 ,but if its a tight new rblt muncie go with the MTL.

Some muncie rebuilders still say to stay away from syn lube and only use conventional lube like for ex the Sta Lube 80w-90 by CRC but i would think Redlines redesigned syn lube for muncies should be ok Esp from a good mfg like Redline.

Scott

thanks, I also checked with summit and they carry the mtl and mt-90 gear oil. They have the mtl listed for 8.99 so if you happen to go through jegs let them know and they should match that price.

Where can you get one of them suction pumps?

This is what I run in mine with no problems.

http://www.amsoil.com/StoreFront/mtg.aspx

I'm with you Dave Amsoil GL-4 gear lube all the way no problems. A bunch of us use 20-50 eng oil as well with the ARO additive which is the same as the old zinc etc additives no problems again. We all run 500 hp plus so spent a lot of time with the Amsoil tech's before useage great products for these older cars and engines --tim--