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Transmission & Driveline Transmissions and Differentials

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Old Apr 22nd, 13, 07:29 PM
SS-Scotty SS-Scotty is offline
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Default Muncie Oil - Please Advise

I am having the hardest time finding and buying the right Oil for the tranny.
I know it needs to be GL-4 - cannot be GL-5
Cannot be synthetic of have any blend of synthetic as the detergents are hard on the syncros.

Every can of oil i seem to locate says it conforms to GL4 and GL5.
I thought I had it licked...bought Lucas Oil - I think it was 75-80 w. It said it was high performance Differential and Manual Transmission Oil
Called Lucas - they said that ALL of their oils are of a synthetic blend, and I would need to add an additive etc etc blah blah blah.
Sorry, don't have a Chemistry Degree.

Can it really be this HARD ? Can someone tell me a make/viscosity etc. and hopefully available at AutoZone or Advance or NAPA - in the USA

Thank you Thank You
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Old Apr 22nd, 13, 07:31 PM
NH69Z28RS NH69Z28RS is online now
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Default Re: Muncie Oil - Please Advise

Go to your local NAPA store and pickup some Sta-Lube GL4 85-90w gear oil.
69 Camaro Z/28 RS, original Azure Turquoise, M21 trans & 3.73 12-bolt posi diff. Re-powered w/406ci, AFR 210 heads, Straub hydraulic roller cam & Dynatech 1-3/4" to 1-7/8" headers. Photos at:
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Old Apr 22nd, 13, 10:16 PM
Straight-line-69 Straight-line-69 is offline
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Default Re: Muncie Oil - Please Advise

Originally Posted by NH69Z28RS View Post
Go to your local NAPA store and pickup some Sta-Lube GL4 85-90w gear oil.
...what he said,..NAPA part number SL24229 (quart bottle).

Or, if you'e feelin' rich, head to your Chevy counter and ask for GM part number 89021671 (23 ounce bottle).

Stay away from any gear oil (which includes most all being sold today at parts stores) that have "Limited Slip Additive included" or "Positraction Additive added", etc. This extra slipperyness (new word) will screw up your synchros (they don't slow down quick enough) and will make for balky shifting in your Muncie.

GL-4,..tried and true!
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Old Apr 23rd, 13, 02:00 AM
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ROBS6T8 ROBS6T8 is offline
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Default Re: Muncie Oil - Please Advise

Yes, what they said.... Napa is the only place I could find the Sta-Lube gl-4.
68 Camaro SS... getting there!!
"If happiness is in your destiny, you need not be in a hurry."
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Old Apr 23rd, 13, 04:14 AM
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Everett#2390 Everett#2390 is offline

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Default Re: Muncie Oil - Please Advise

Yep, GL-4, no additives.
You can fill the trans through the shifter boot with a hose, preferredly clear, and a coat hangar to hang the bottle from the rear view mirror.
Punch a hole in the bottom of the upside-down bottle and let gravity takes it course.
Give a man a rescued dog for the health of both their souls.
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Team Camaro Tech > First Generation Camaro Info and Tech - 1967- 1969 "Where it all started" > Transmission & Driveline      Current Topic: Muncie Oil - Please Advise
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