It could be a tie-rod if it happened all the time, but it only happens at certains speeds, so I would start "deducing" the problem. Start by getting your tires balanced/rotated, then get an alignment done.
you are right i got my tie-rod checked and it is fine, the tire pressure is good.. is it expensive to do the alignment and balancing?
If you got your tires at a shop that warrantees them, like Discount Tire Co, then its free to balance and rotate. The alignment at most shops is between $45-$60 dependin on where you go to. Its not that much to get done.
Another source of vibrations or shimmy on the R50 Pathfinder while driving is the rear axle trailing arm/control arm bushings going bad. Have the rear end checked out. It's a common problem.
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'88 Pathfinder: 6" of lift, 33x13.50 Swamper LTB's, Rancho 9000's, L&P Stage 3 steering system, K&N, Pacesetter headers and 2.5" exhaust, Lock-Right locker, 110A alty and electric fan swap, dual batteries, 700W+ worth of PIAAs, etc.
If nothing else fixes your shimmy have a dealer check for "Road Force Variance" in the tires. This is a common but little known problem with many shops. Mine was so bad they had to replace 3 tires that were brand new. It could be in your tires. My vehicle was under waranty, so they didn't want me to keep coming back. Do some research on this problem though if you suspect that's what it is. It's always better to be knowledgeable when you go in.
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