First my problem... I have a Unlimited JK with 5.13 gears on 4" Evo plush springs with Rock Krawler upper and lower arms. I am having a front driveshaft vibration that starts around 65-70 and gets stronger up to 80mph. I do a lot of freeway driving and I usually cruise around 70-75mph range.

I have gone through 3 different brands of front driveshafts in a quest to get rid of the vibe. So the driveshaft is not the problem, it has to be the angle of the pinion. I have adjusted the front pinion angle and it doesn't make much of a difference, the vibe is still there even when the caster is decreased so much that the JK drives like crap.

So this brings me to my question. I am currently on 35" Toyo M/T's. If I were to jump up to 37" Toyo's, would that slow my driveshaft rotation enough that it would move the vibration higher into the MPH range that I never drive in? Like I said earlier, the vibe comes on at 65-70 and I normally cruise at 70-75 so would going to 37's move the drive shaft vibes to say 75 and up?

I know the other option is to get a Pro Rock 44 that already has a better pinion angle to begin with, but that is not a short term option for me right now.

Let me know what you guys think.

 

37s @ 70-75 will spin your DS as fast as 35s @ 66-71.

 

Thanks for the info!


I was hoping it would have made a bigger difference.