I Might Just Know What I'm Talking About
Join Date: Apr 2002
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Can I get your opinion on my Dodge problem?
Normally I'm over in the Jeep side but I got a problem I was hoping you guys could give me some advice on. I have an 05 1500 with the 4.7. All I do with the truck is tow and haul mostly. Anyway, with the power lacking in the 4.7 for towing a 5000lb camper, I had some 4.56's swapped into the 8.25. Not knowing much about gear swaps, I trusted the mechanics I've used and now I have had major issues. The first mechanic totally f it up ( I won't go into how bad it was) and the second guy did better but not 100%. When I tried to get him to finish the job he just shrugged his shoulders and sent me on my way - $600 lighter. Obviously these guys are not getting the backlash correct as I have a pretty loud whine on the drive and coast side but my main concern is a vibration that develops at 78 mph. Drive shaft is balanced and not hitting critical speeds. U-joints are good. Last night I jacked up the rear, removed the wheels, indexed the drive shaft to the yoke and shimmed the transmission about 1/2" with some poly bushings I had laying around from a new set of shocks. It seemed to reduce the vibration but it's still very noticeable although now instead of the truck sounding like it's going to blow apart at 80, I can take it on up to 85. Would just changing gears affect the pinion angle any? I'm going to shim in about another 1/2" this weekend to see if that helps.
Any ideas? These so called "mechanics" around here have me gun-shy about taking it in anywhere else. I think my next stop is a big-truck shop.