12 bolt axle date code - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Seanext** · 04-14-2014, 10:13 PM

I have a 71 SWB 4X4. I am do a complete rebuild on my truck and have already stripped it down to the frame. I started rebuilding the rear axle. The parts for a 71 don't seem to be correct. I am thinking the rear has been swapped out at some time in the past. The casting number is 3896839 GM55 and the numbers stamped on the axle tube are RAY W095 1. Is there anywhere to decode these numbers? I have searched the web with no luck.

04-14-2014, 10:13 PM	#1
Seanext Senior Member Join Date: Mar 2013 Location: Dallas NC Posts: 583	12 bolt axle date code I have a 71 SWB 4X4. I am do a complete rebuild on my truck and have already stripped it down to the frame. I started rebuilding the rear axle. The parts for a 71 don't seem to be correct. I am thinking the rear has been swapped out at some time in the past. The casting number is 3896839 GM55 and the numbers stamped on the axle tube are RAY W095 1. Is there anywhere to decode these numbers? I have searched the web with no luck.



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