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Custom Chassis - Drive Line - Suspension - Wheels and Tires - LIFTING - Dodge Ram 4x4, 2x4 Discuss anything related to Custom Dodge Ram Wheels, Tires, Brakes, Suspension Mods, Chassis Mods and Tuning, Towing options, Driveline, 4x4, Differentials, Sway Bars, Lifting Springs, Body Lifts, Strut Braces, etc.

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Old 02-15-2013, 06:34 PM
Chickenhole's Avatar
Chickenhole Chickenhole is offline
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Originally Posted by neuman22 View Post
Last month I was finally able to get the 4 inch Mopar i.e. Superlift kit and 35 inch tires put on my '09 4x4 crew and it looks awesome. Last week I noticed that when letting off the gas at 30mph+ I'd hear a whining/humming noise like something was winding down. I crawled under the truck and noticed there was rear diff fluid slung all on the gas tank and the underside of the truck. I took it into the dealership who installed the lift and they said that because of the higher driveshaft angle from the Mopar lift it was causing an extreme strain on the 3.55 rear end and sheared out the bearings and pinion which I find extremely odd considering I've put maybe 1k road miles on my truck since the lift was installed. No offroading yet, but that's about to change now that duck season is coming up. I have 66k miles on my truck now, lift was put on at about 65k. Luckily they replaced it under the factory lifetime power train warranty, but my service rep said that it will more than likely strip down again in a month and recommended I get 3.92's installed. I had though about it previously so I asked how much $$$ to which he replied $3k..... Uh, yeah no, fix it under warranty for now and I'll take my chances. I've scoured the intercrons and wasn't able to find anyone else experiencing the same problem. I even called superlift and asked them if they've heard of this issue since it's their lift and they said that was BS. So..... I wanted to put the feelers out to get some other opinions/experiences/knowledge from the community. My personal research/opinion leads me to believe that the bearings and pinion were probably going bad and maybe the lift was the straw that broke the camels back, but I don't think that it could completely strip out after 1k of normal road miles.

So please.... cuss and discuss..
I have the same lift, with over 30000kms(20000m) and no problems. Im pretty sure your 09 falls in that recall on the pinion nut. If you do change gearing definitely go with 4.56, 3.92 will hardly make a difference with those big tires. I got a quote here in canada for 4.56 on my truck for $2200 with tax.
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