Help Me Identify This??

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try to find a late model 915 these will have the 8:31 ring and pinion, which I think that you will like far more then the 7:31. Numbers on the bottom will be 915 / 61 and up. I would avoid a Mag box (magnesium) as these tend to have issues with intermediate bearing failure, as well as side plate blow out.

Just my two cents. Let me know if I can be of any help.

Erik @ Carquip
(303) 443-1343 ext 2