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post #1 of (permalink) Old 12-21-2006, 09:21 AM Thread Starter
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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.
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post #2 of (permalink) Old 12-31-2006, 10:09 AM
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Re: Can I get your opinion on my Dodge problem?

[img]/ubbthreads/images/graemlins/AR15firing.gif[/img] Jeeps!!!

j/k sorry...couldn't resist! [img]/ubbthreads/images/graemlins/40BEER.gif[/img]

I personally don't see how changing out a ring and pinion could affect the driveshaft angle.

I have always left my gear swaps to shops that are in the business of doing just that. I would find a local 4 wheel drive shop that has experience doing gear swaps, and then I would go to some of their customers to find out what kind of work they did and if they were happy.

I have had the gears in both my XJ and CJ repalaced by 4 wheel drive shops and have not had a problem. I wouldn't even trust the Jeep dealership to do the gears on either vehicle, just becasue I don't believe they are experienced in that type of work.
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post #3 of (permalink) Old 01-02-2007, 11:18 AM Thread Starter
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Re: Can I get your opinion on my Dodge problem?

[ QUOTE ]
[img]/ubbthreads/images/graemlins/AR15firing.gif[/img] Jeeps!!!

[/ QUOTE ]

Jealousy is such an ugly monster.... [img]/ubbthreads/images/graemlins/spank.gif[/img]

[img]/ubbthreads/images/graemlins/grin.gif[/img]
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post #4 of (permalink) Old 01-07-2007, 09:40 AM
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Re: Can I get your opinion on my Dodge problem?

in my 1500 4.7 i installed a jet stage 2 hyper chip which requires intake and exhaust as well as thermostat upgrades. i used a k&n tornado intake, throttle body spacer, low temp therm. and dual exhaust altogether it really woke the truck up. increased power and gas mileage quiet a bit. i am now installing a lift kit and tires with a new set of gears but i'm looking more like 5.29's in the rear however i'm no expert at the whole gear thing. justin
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