I did the rear shackle lift on my 98 fronty4x4 and now my truck is shaking when takin goff in 1st gear. It only does it until I am off the clutch and rolling.

Sounds like a little axle wrap.

It didn't do it before so why is it doing it now, could it be the shackles????

Possibly. One quick way to find out, is to put your stock ones back one.

I got some bigger tires From 235 to 31" MT plus the shackles and it raised my trk about 2.5" in the rear. I think my springs are too soft for the larger tires. I cannot put the stock tires back on cause they are off the rims.

Do you have blocks under the rear springs? Longer shackles should not make your truck shake.. So you have any kind of a traction aid?

longer shackles can alter the pinion angle though. Could be gettign some driveline vibes from misaligned U joints.

No blocks and the shackles are 6" apart from the holes. Thanks,

I have 7" shackles on my '98 and don't have this problem. What you describe sounds more like clutch chatter to me since you say it's doing it until you're off the clutch. Is the clutch old?

100k on the trk and I think it's the oroginal clutch.

I didnt think about the clutch.. that could be it. The flywheel may have some burned spots on it. I had an old Datsun that had this problem.

Take the flywheel to a machine shop and they'll resurface it for you.

I gues it's clutch time. I was hopping for something simple. Is the napa brand clutch a good one or do i need to get OEM for it? time to get the book out on clutch replacement; never done it before. Thanks for the info,

I've got a napa clutch in mine and it's been fine for 4 years.

I would look a little further. I got a 110K on my stock clutch. Depending how you ride your clutch it can last up to 160K.

Sorry I didn't check this thread sooner. There is one possibility that was not mentioned directly; driveshaft phasing.

Have you recently had your driveshaft apart at the carrier bearing? If so, you may have putt it back together "out of phase". That will cause the vibration that you are describing. An our of phase conditions will only be felt in first and (possibly) second gear.