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#2_junkie

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just swaped my ford 10.5 3.73 ring and pinion for a nitro gear 4.30 10.25 set. new gears came with master install kit and 10.25 bearings. after 2 days of shimming and cussing and hammering i came out with a pinion bearing preload of 27in/lbs and backlash of .013in the paint pattern showed perfect center heel toe but d shaped both drive and coast toward the flank. now i have 100mi on break in but a nice whine at coast/cruise but nothing on accel/decell. im thinking the pinion needs a couple thou more because the install kit came with a race spacer for the 10.25 pinion bearing but due to the limited slip carrier the shim(at a thickness of .012) the pinion contacted the carrier. i removed 4 thou to get the pattern but like i said it was pretty nice D shape.

couple of my friends that own shops and have done quite a bit more gears than I say i should run it to 500 first before i pop the diff cover again. but im one of those if its not right get back into it till it is.

any info is greatly appreciated
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gbowne1

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Posts: 12
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I'm fairly new at this part of it but I've been using a Ford 9" with two different gear sets for which ever driving I'm doing most of. Mainly being 3.73 & 4.56 on a 28 spline. Gears from Yukon. Axles' are Yukon as well. 5x4.5 pattern. I can't remember if the yoke was 1350 or 1310. But it spins a Inland Empire shaft pretty good. From a 700R4/4L60. I used to have a GM 10 bolt that wasn't as nice. Anyhow there's my setup FWIW. Other guy I know uses a Aluminum shaft. I asked about this stuff a few years back and got a variety of response so...
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