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Old 08-01-2011, 12:20 PM   #1
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'88 Winnie P30 differential lube spec????

I'd like to change the differential lube in our '88 Winnie MH with the P30 (or more accurately, P32?) chassis, but can't find any info in my manuals or online as to the specs for the differential anywhere - what type, weight and volume lube is used in these differentials, anyone have factual info?
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Old 08-01-2011, 09:00 PM   #2
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Here's where you can download the manual:

P30 Chevrolet Motorhome Chassis Manual

You'll find the different diffs capacities listed section 1, page 5
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Old 08-05-2011, 01:27 PM   #3
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Quote:
Originally Posted by ahicks View Post
Here's where you can download the manual:

P30 Chevrolet Motorhome Chassis Manual

You'll find the different diffs capacities listed section 1, page 5
Thanks - after posting, I checked my own copy of that manual - found the capacity, but no info on the lube spec. Eventually found a source claiming the differential takes 90/140, in GL5 - so unless other info comes to light, I'll be using that stuff I guess...
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Old 08-05-2011, 05:32 PM   #4
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I'm guessing that there are better lubes out there than there was in 1988.

Synthetic 75w-140 GL5 would be a good modern replacement. Runs cooler, less friction and lubes better in cold weather.

Best price I've found is for Lucas brand on Amazon.
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Old 08-05-2011, 11:04 PM   #5
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I ended up with Valvoline 85/140 in GL5 - so it will have to do this time around...

Looks like the drain and refill will be sort of a major event - there is no apparent drain plug, and the check/fill port is well blocked off by my 80 gallon fuel tank. My best bet looks to be to suck out the old lube thru the fill plug port, and then pump in the new stuff thru the same port using appropriate pump setups...
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