Where Do I Fill This Thing?

[magwakeenercew2jh]

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.

[jocko]

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).

[texnician01]

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.

[c1069]

YOU WILL FIND SOME HELP HERE. http://www.gmcpauls.com/67-72_chevy.htm

[RexDodge]

Originally Posted by magwakeenercew2jh

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.

Just find that plug on the side. It should hold 2 quarts. Just fill it until it reaches the bottom of the hole and your good.