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**Ironangel** · 08-12-2018, 05:23 AM

Take your pattern check after you have set your new races and bearings, and after you've got the backlash set. The initial pattern you showed was not bad for a truck 12-bolt with 125K on the clock. If it were me? I'd go right back with the same factory pinion shim under the new bearing and button that baby up. .006" backlash is dead nuts on a 50 year old 12T. On final assembly, tighten that pinion nut until you feel zero end play in the pinion, then take your pinion preload measurements after 1/8th turn increments. I'm not a guru, I just rebuild rear ends to supplement my pension and "Nasty Sally's Boutique"

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08-12-2018, 05:23 AM	#11
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Any ring and pinion guru's out there? Take your pattern check after you have set your new races and bearings, and after you've got the backlash set. The initial pattern you showed was not bad for a truck 12-bolt with 125K on the clock. If it were me? I'd go right back with the same factory pinion shim under the new bearing and button that baby up. .006" backlash is dead nuts on a 50 year old 12T. On final assembly, tighten that pinion nut until you feel zero end play in the pinion, then take your pinion preload measurements after 1/8th turn increments. I'm not a guru, I just rebuild rear ends to supplement my pension and "Nasty Sally's Boutique" https://www.facebook.com/media/set/?...1&l=54c2c06b2e __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" Last edited by Ironangel; 08-12-2018 at 05:37 AM.