Hey guys found this code on my passanger side axle. Srb 237 2. Can't seem to decode myself anyone have an idea? Car is a 1971 442 with supposed to be 3.08 non posi. Car is a 10 bolt 8.5 corporate rear from what I can gather. Wanting to order lower gears and posi differential to get away from the airplane gears. Our local track is only 1/8 mile. In 71 were 28 splines used or 30 was wondering if that code would tell me or is there a code someplace that would tell me. Thanks for any info guys. Also anyone who has a rear end for sale that has posi 3.90 or lower I'm in the market.

 

Found what I was looking for, SR decodes to 3.23 ratio the B for it is a Buick rear then rest of the number are for the day of the year and shift made. Found some good info from this page http://www.oldcarmanualproject.com/m...Ill/Group5.pdf

 

Good information.