Sorry for the newb post but I've been noticing a slight shudder from the rear of the truck when taking off from a dead stop. I haven't really stomped on it yet so it's always been during light to moderate acceleration. I'm pretty sure if I take off in a straight line there's no shudder but I want to test that a few more times to be 100% sure. However, I'm absolutely sure that when I make a left or right turn it definitely does it.
The truck was purchased used last week and is an '06 XLT/FX4 SuperCab longbed with 91k miles on it so far and is bone stock and no tunes (yet). I checked and it has a two piece driveshaft. If I were to guess I would think it's the rear diff (3.73 LS (axle code 3L)) since it always seems to happen when making a turn and accelerating. If it's the center bearing causing the shudder then I'm not sure I understand how it could cause that. I guess once it warms up outside again I'll get out there under it and see if those drive shafts have any play in them.
I was going to change out the rear diff oil to see if that helps but wasn't sure if I should add a friction modifier to it or not. Does the LS diffs in these trucks require a friction modifier? My old '97 Dakota required it just not sure if the F350 with LS does.
What's funny is that I test drove a used F250 and two other used F350's and they all had that rear shudder. I must have subconsciously ignored it when I test drove my '06 because I was so smitten with it.
The truck was purchased used last week and is an '06 XLT/FX4 SuperCab longbed with 91k miles on it so far and is bone stock and no tunes (yet). I checked and it has a two piece driveshaft. If I were to guess I would think it's the rear diff (3.73 LS (axle code 3L)) since it always seems to happen when making a turn and accelerating. If it's the center bearing causing the shudder then I'm not sure I understand how it could cause that. I guess once it warms up outside again I'll get out there under it and see if those drive shafts have any play in them.
I was going to change out the rear diff oil to see if that helps but wasn't sure if I should add a friction modifier to it or not. Does the LS diffs in these trucks require a friction modifier? My old '97 Dakota required it just not sure if the F350 with LS does.
What's funny is that I test drove a used F250 and two other used F350's and they all had that rear shudder. I must have subconsciously ignored it when I test drove my '06 because I was so smitten with it.