Diff Ratio ID - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**'68OrangeSunshine** · 08-06-2010, 01:44 AM

I have a '72 K/5 parts truck. I want to cannibalize the rear axle for a replacement on my '71 Jimmy 4x4. I pulled the differential cover and read off the following numbers:
326663
N
GM 34
3817779
14:43
GM 09752
015 [hand stamped]
This is an open diff 12 bolt.
We turned the tire about 3 times for one turn of the ring gear.
I'm guessing 3.07:1,
I was hoping for a 3.73:1 for a direct replacement. I might get by with the 3.07 temporarily while I rebuild the 3.73 Posi, if I disconnect the front prop shaft so I [or someone else who is not familiar with the swap] don't accidently shift into 4WD and tear up the driveline and/or transfer case.

08-06-2010, 01:44 AM	#1
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,567	Diff Ratio ID I have a '72 K/5 parts truck. I want to cannibalize the rear axle for a replacement on my '71 Jimmy 4x4. I pulled the differential cover and read off the following numbers: 326663 N GM 34 3817779 14:43 GM 09752 015 [hand stamped] This is an open diff 12 bolt. We turned the tire about 3 times for one turn of the ring gear. I'm guessing 3.07:1, I was hoping for a 3.73:1 for a direct replacement. I might get by with the 3.07 temporarily while I rebuild the 3.73 Posi, if I disconnect the front prop shaft so I [or someone else who is not familiar with the swap] don't accidently shift into 4WD and tear up the driveline and/or transfer case. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 08-06-2010 at 01:51 AM.



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