Author Topic: Fluid change M22 and 373 posi  (Read 175 times)

1967CorvetteCoupe

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Fluid change M22 and 373 posi
« on: March 04, 2024, 02:02:51 AM »
Any advice would be appreciated as to brand and weight oil to use in my '69 Z28. The car has an M22 trans and posi 3:73 rear. Looking to change both.

camaronut

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Re: Fluid change M22 and 373 posi
« Reply #1 on: March 04, 2024, 02:56:10 PM »
I'm sure JMN chimed in on something like that on this forum.  He would know, or just follow what the GM manual recommends, except maybe go synthetic. 
Not sure how that would work mixing synthetic with residual dino-gear oil.

cook_dw

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Re: Fluid change M22 and 373 posi
« Reply #2 on: March 04, 2024, 03:54:35 PM »
Do not use synthetic oils.

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bcmiller

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Re: Fluid change M22 and 373 posi
« Reply #3 on: March 04, 2024, 04:09:42 PM »
Do not use synthetic. I buy this by the gallon but you can get it by the quart.

For the rear end, you will want to put in the GM posi additive too.
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

maroman

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Re: Fluid change M22 and 373 posi
« Reply #4 on: March 04, 2024, 04:29:04 PM »
What did GM switch to for posi additive since they quit killing sperm whales?
Doug  '67 RS/SS 396 auto I know the car since new

bcmiller

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Re: Fluid change M22 and 373 posi
« Reply #5 on: March 04, 2024, 05:59:01 PM »
This. Not sure exactly what is in it. I sometimes use the Yukon brand additive too.
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

maroman

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Re: Fluid change M22 and 373 posi
« Reply #6 on: March 04, 2024, 09:32:39 PM »
I just remember the clear bottles of stuff from the '60's that really worked. I knew a parts manager that ordered hundreds of cases when it was first discontinued. That may have been in the early '70's when it was not PC to kill sperm whales..
Doug  '67 RS/SS 396 auto I know the car since new