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Thanks for the replies guys, I'm not set on replacing any of the drive train in the truck. This guy from NAPA just planted a seed in my head about other differentials. I don't really do a lot of off roading. Mostly highway and around town. I was thinking about a different gear ratio though. I think I have 4.11's in there now because it's wound pretty tight at 65 mph, haven't pulled the covers yet. I also have a 70 3/4 ton 4x4 that rides smooth at 75 (about 2850 rpm's) but is a little slugish. I haven't pulled those covers either but the PO said 307's. Since you guys tell me that both factory differentials are heavy duty I doubt I'll chance them. I just like over kill. When I was issued my M16 in the Marine Corps I had to have the M203 grenade launcher too. Better to have it and not need it theory. Any thoughts on a good highway ratio that will still give me good power? Thanks for all your help.
Scott
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