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#1 |
RAT1968 '68 Cab/'71 Parts
Join Date: Feb 2002
Location: Coarsegold, CA
Posts: 2,375
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Where Do I Fill This Thing?
Unfortunately, I put the bed back on before I looked around at the pumpkin and differential case for a filler hole. P/O/ pal went with this ribbed cover.
I can see the drain. I have a gallon of new lube for the differential that has a pump on it (altho I'm not sure how much the rear end holds). I'd like to save at least a little dirt in the eyes by asking you folks before I crawl under there tomorrow. Also, can I get some idea of the (original) rear end gear ratio from the casting on the case? Thanks.
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M17 Coarsegold, CA RAT's shiny now. But always a rat. |
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#2 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Where Do I Fill This Thing?
should be a removeable plug on the fwd side of the pinion housing - normally on the passenger side. It should look like something you can insert a ratchet or ratchet extension directly into with no socket (i.e. a square hole).
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#3 |
Senior Member
Join Date: Mar 2002
Location: 12 Miles South of Des Moines, Iowa
Posts: 359
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Re: Where Do I Fill This Thing?
Easiest way to tell rear end ratio is to jack up ONE tire, put the trans in neutral and turn the tire TWO full turns. Count the revolutions of the driveshaft, may help to mark it with a piece of chalk or a tape flag. More than likely it it either a 3.07 or a 3.73 so a little over 3 turns, 3.07, almost 4 turns 3.73. Of course if it has a Posi rear you may have to jack up both rear tires, do the same thing but only turn the tire once. You have to make sure that the other tire is turning the same amount though or you will get a messed up reading, They must turn in sync. Hope that helps.
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69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran ![]() Nathan & Tiffany |
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#4 |
Registered User
Join Date: Apr 2010
Location: McFarland CA
Posts: 1,392
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Re: Where Do I Fill This Thing?
YOU WILL FIND SOME HELP HERE. http://www.gmcpauls.com/67-72_chevy.htm
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Pancho 69 c/10 step side 454/400 with 3.07 |
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#5 | |
Registered User
Join Date: Apr 2008
Location: Oregon City, Oregon
Posts: 741
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Re: Where Do I Fill This Thing?
Quote:
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