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Old 06-13-2020, 09:44 PM   #1
Cpuckett
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Default 31 model A rear end question

In the process of rebuilding my rear end. I read that it calls for a pint and a half of 600 W. grease. My rear end has 2 plugs (off set). The top plug is at approximately 3-4 o’clock looking at it from the driver side. The bottom is approximately 5 o’clock. Question, do I fill it up until it almost flows out of the top one?
Thanks in advance!!
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Old 06-13-2020, 10:09 PM   #2
Truckerjim
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Default Re: 31 model A rear end question

Yes, upper is to fill and check , lower to drain. Only fill till when you put your little finger in to your first joint on it. That is all that is needed. Check level a few days later after driving .
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Old 06-13-2020, 10:23 PM   #3
Cape Codder
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Default Re: 31 model A rear end question

Cpuckett Your should put in 600W Oil and NOT 600W grease as you stated.
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Old 06-14-2020, 11:59 AM   #4
Jim Brierley
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Default Re: 31 model A rear end question

I would use modern oil, 90 weight.
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Old 06-14-2020, 12:37 PM   #5
jb-ob
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Default Re: 31 model A rear end question

Jim Brierly,

" ...modern 90 wt" ???

Not a challenge, respect where & how you've driven your Model A's, so you probably have a good thoughtful answer. Appreciate it if you share.

Thanks, jb
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Old 06-14-2020, 03:37 PM   #6
Cpuckett
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Default Re: 31 model A rear end question

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Quote:
Originally Posted by Cape Codder View Post
Cpuckett Your should put in 600W Oil and NOT 600W grease as you stated.
Thanks, I meant oil lol
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Old 06-14-2020, 05:47 PM   #7
rotorwrench
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Default Re: 31 model A rear end question

The old 600 steam cylinder oil is largely outdated by more than a few later developements in gear lubricants over the last 90 years. The 600 oil was not graded by the SAE. A more modern lube would be an SAE 140 type gear lube so it's not all that easy to find either. Now days the SAE 85W/140 GL5 is pretty common and can be used without worry in a rear axle. The High EP could be harsh to soft metals in a transmission but then a transmission would likely work better with a less viscous grade like SAE 80W/90 which can still be purchased in GL4 medium EP. The model A transmission doesn't have as much soft bushing or thrust bearing material in it but it does have some.
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Old 06-14-2020, 07:26 PM   #8
Jim Brierley
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Default Re: 31 model A rear end question

I'm a firm believer in modern oils which are much improved over Model A era oils. Just because A's came with certain oils doesn't mean that is now the best for them. Additives have improved oils over the years, even to make them more slippery, less apt to foam, etc. Gear material (steel) hasn't changed much, but why not use the best for them? I don't travel cross country in my A's, but used to go once a year to Las Vegas from West Covina, 260 miles one way. I now live in Temecula and it is 45 miles to the nearest Club member, we have monthly meetings at various members home or shop. I was a truck mechanic for many years, and have witnessed what non-detergent engine oils do to the insides of engines, leave a mess!!!
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Old 06-14-2020, 07:59 PM   #9
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Default Re: 31 model A rear end question

Thanks Jim, jb
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