Wanted to hop on here and see if anyone knew what could be going on with my 80. At approx 55 miles an hour while maintaining speed or coasting I feel a pretty violent lurch. Feels like it could be driveline related. My 80 is lifted 3 inches, no caster correction, but does have a front dc drive shaft. And another thing that just crossed my mind is the slop in the driveline when I let off or accelerate. Possibly Just a uv joint? I know I gave limited information but that’s about all I have. Thanks guys.
I'm going to reply here instead of on PM in order to keep the benefits for others out in the open in case someone else is searching for a similar issue.
What year is your truck?
How many miles (approx) are on the truck?
What recent services have you done (in the last 25K minimum)?
Does the lurch feel like something is binding?
Is there a noise associated with the lurch?
Is your rear driveshaft properly in phase with itself?
Are your U-Joints in good shape?
Does the noise / lurch change after you grease the U-Joints and slip yoke?
Is the lurch repeatable under controlled conditions?
Are your front wheel bearings loose? Properly adjusted at 35 LB Ft / 45 LB-FT?
Which direction do you have your DC front DS installed? Which end is the slip yoke?
Have you done any front axle alignment to properly position your DC shaft?
Have your suspension bushings been replaced with OEM? Anything else?
Have you changed all your fluids or at least checked them to make sure there is no debris or stripper glitter in the oils?
Are your pinions loose? (Does the shaft move in and out with rotation?)
There are LOTS of possible issues here from misaligned driveshafts to loose wheel bearings to bad bearings in the transfer case.
If you don't know how to check this stuff, say so so we can flame you,............................................... I mean help you.
