I have a friend with a 2000 L. Above 70 mph you feel a vibration from rear of vehicle. It has new nitto's, went to the aluminium driveshaft. Still has the vibration. Any help would be appreciated.
The vehicle has about 15,000 miles on it. Thanks william

 

if your are sure that the drive shaft is good and tires are round.

I suggest you jack it up (good jack stands) and look for the vibration.
sounds like something might be loose.

Tony

 

A lot of trucks came from the factory with a 70-80 mph vibration...

 

Maybe you just lost a wheel weight. Its always a good place to look. Sometimes we over look, something simple thinking the worst Artie!

 

I bet it is in the exhaust

I would say loosen everything up, wiggle everything, star the truck. Let it heat up and re tighten the exhaust, but if it is a 2000 I bet you would have a hell of a time loosening it.

 

Stock exhaust?

Mine had a terrible vibration in the 70/80mph range. Put the Bassani cat back on--------Vibration gone!

If you feel the weight of the stock muffler, you can see how there "could be" problems

 

Mine had vibration at the same speed after I got my new tires on. Turned out the wheels weren't balanced correctly.

 

Anyone figure out where it's coming from?
I see Don's bolt suggests the exhaust.

 

Got an 03 lightning back in oct. of last year. I can go from zero to one hundred forty and not feel the slightest vibration. And the thing tracks like it is on RAILS!!...... just thought Id say how good my truck was driving so people didn't read this post and think that lightnings suck haha

 

okkk

 

 

see my post

 

My bet is that it is the balance. Here is the story of my saga:

http://www.nloc.net/forum/showthread...rating+console

 

Found the cause of the vibration in the driveline above 70 mph.
Took the driveshaft to a shop to check the balance & sure enough it was out of balance. Balanced shaft now smooth as glass at all speeds. William