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71GMC 4x4 · 05-15-2002, 12:12 AM

I have a posi carrier for a 12 bolt. I need to know what series it is. How can I tell the difference between a 3 series and 4 series? I'm going to 4.56 gears, and I don't know if I need to buy thick gears or regular gears. Please help me out. Thanks, Albie

05-15-2002, 12:12 AM	#1
71GMC 4x4 Registered User Join Date: Mar 2002 Location: Redway,Ca. U.S.A Posts: 37	Difference between 3 series and 4 series carriers? I have a posi carrier for a 12 bolt. I need to know what series it is. How can I tell the difference between a 3 series and 4 series? I'm going to 4.56 gears, and I don't know if I need to buy thick gears or regular gears. Please help me out. Thanks, Albie __________________ [IMG]http://mustangmods.com/publish/topless99/truck2.jpg[IMG]