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Bad Vibrations on Highway and Bucking During Roll to a Stop

1206 Views 7 Replies 5 Participants Last post by  LUBECAKES
My truck is a 2008 Pro-4X with 131,000 miles on it and it seems I have been having to do some higher dollar maintenance over the last few years.
At 80,000 miles I bought new front hubs/bearings, bought my 3rd set of Nittos at 88,000, had my front differential rebuilt and the driver's half-shaft
replaced at 126,500, and now I'm having some serious fast vibrations right under my feet, when doing about 35 mph and 65-75 mph.

Today, I raised the truck up on 4 jack stands to run it off the ground....but NO vibrations in 2WD or 4WD when raised up off the ground doing up
to 90 on the speedo..............UNTIL I started to brake. It was like my rear end was not wanting to slow up and was bucking to keep going......
once my wheels had come to a complete stop, I shifted into Neutral, let go of the brake,then low and behold, my rear driveshaft starts spinning
like it is engaged. I slowed one rear wheel to a stop before it started really going fast, but the diff let the other side pick up speed still......

I've noticed for some time(years) that when slowing at a light or to a stop from 35+mph, it always seems like my truck feels like it keeps on pushing or shifting down unevenly when braking to a stop. Like it still wants to go. Anyone else have similar issues?:frown:

QUESTION: could it be that my transmission is needing some work?
- Is it normal for the rear driveshaft to still want to spin when in Neutral without rolling resistance on the ground?
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That definitely doesn't sound normal.

Sometimes when slowing, I'll just get what feels like rough downshifts from time to time, but that's about the extent of the "bucking" I've experienced. It never feels like it wants to take off on me or anything. Truthfully I wouldn't know where to start looking in to an issue like that, but I'll stick around for some answers out of curiosity.
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