Who has setup their own gears? Question about pinion shims... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**CMars45000** · 02-09-2007, 10:12 AM

Well I was setting up my gers in my 12-bolt for my 71 last night. The axle originally had a factory eaton posi and 3.07 gears. I have a new 4-series Eaton posi and 3.73 gears that are going in.

When you guys have set up these gears how many shims did you need to get the pinion depth right? I measured the pinion depth and came up with a really screwy number so I am just gonna go by trial and error at this point. I started with .025" and it was to far out then I went to .095" and it was binding so now I have .045" but was too tired to put the rest back together and finish running a pattern last night...

does .030-.035" sound about right?

02-09-2007, 10:12 AM	#1
CMars45000 Registered User Join Date: Jul 2006 Location: Pittsburgh, PA Posts: 204	Who has setup their own gears? Question about pinion shims... Well I was setting up my gers in my 12-bolt for my 71 last night. The axle originally had a factory eaton posi and 3.07 gears. I have a new 4-series Eaton posi and 3.73 gears that are going in. When you guys have set up these gears how many shims did you need to get the pinion depth right? I measured the pinion depth and came up with a really screwy number so I am just gonna go by trial and error at this point. I started with .025" and it was to far out then I went to .095" and it was binding so now I have .045" but was too tired to put the rest back together and finish running a pattern last night... does .030-.035" sound about right? __________________ Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle



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