201fireman Posted March 12, 2018 Share Posted March 12, 2018 I have a 72 Monte with an Eaton Truetrac 12 bolt, series 3 posi and 33 spline Yukon axles. I am looking at a set of 3.73 ring & pinion gears out of a 70 Chevelle 12 bolt. They have the part number 3862525 stamped on them. Will these work in my unit? Quote Link to comment Share on other sites More sharing options...
72-CLASSIC_RIDE Posted March 12, 2018 Share Posted March 12, 2018 You should be able to reference Differential websites like Rand'ys Ring & Pinion (example). Both are 3 Series so should interchange. Not certain about the axles or if even factory rear axle. Doug Quote Link to comment Share on other sites More sharing options...
MC1of80 Posted March 12, 2018 Share Posted March 12, 2018 Short answer---- yes I have a set of GM 3:31 in my 12 bolt with a Detroit trutrac and strange axles. Quote Link to comment Share on other sites More sharing options...
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