Wierd vibration/sound HELP!

If you feel the vibration in the steering wheel it is probably a front tire balance issue. If you feel it in the shifter and not the steering wheel it is probably your driveshaft or rear tires out of balance. I'd check the driveshaft first. Since you had a tranny installed, the driveshaft may have been installed out of index. To index the pinion side(rear axle side) of the driveshaft first, mark the pinion and yoke in its current position, then index it 180 degrees. If it changes the vibration but doesn't eliminate it try indexing 90 degrees from the last position. Again, if it changes but doesn't eliminate it, index 180 degrees again. If that doesn't do it now try the four positions that you haven't tried already.

Good luck.

I'm sorry, I'd check the tire balance first. Then check the driveshaft. I just reread your message.

FrdMustangCpe said:

Well they balanced the tires when they mounted them. Do you mean check the alignment?

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ya if the tires are outta alignment they will vibrate they do balance them but alignment is extra with a tire job..................and yes the tires will mainly vibrate at highway R's so you have a tire outta whack some where.