Rear driveshaft vibrations improve with pinion 1 degree above the driveshaft angle

[mrblaine]

I'd be lying if I said I wasn't tempted to expedite this process even further by running the process with one upper arm removed so each adjustment took half the time. I'm on the ledge and all I need is the word of someone I respect to either push me off or back away.

For simple testing purposes, no wheeling, no hard braking (though it's the rear axle anyway, so...) Probably remove the passenger and keep the driver UCA installed since it's mount is beefed up for double duty with the track bar...aside from damage to a bracket my other concern is how well 1 stock sized UCA will locate the axle under load to maintain 80mph, and if I get the vibes adjusted out will they just come back because things don't fall into the same place with both arms installed. Or will the synergy DDBs in the LCAs flex enough that the axle housing goes wonky with thrust angle from the offset of the UCA and I end up chasing my tail.

Thinking through a legitimate time saver or ravings of a madman? Sometimes it's hard to know the difference. I'm great at thinking of what can go wrong, much less good at estimating their likelihood.

You are reducing the constraint by half. That will let it move under load and may give a false adjustment for vibe mitigation. What most miss is the jam nuts only have to be snug, a proper wrench, you crawl under, takes a minute to pop all 4 jam nuts loose, grab both at the same time, turn both at the same time, snug the jam nuts, go for a drive. Literally takes 5-6 minutes per stop.

 

[freedom_in_4low]

You are reducing the constraint by half. That will let it move under load and may give a false adjustment for vibe mitigation. What most miss is the jam nuts only have to be snug, a proper wrench, you crawl under, takes a minute to pop all 4 jam nuts loose, grab both at the same time, turn both at the same time, snug the jam nuts, go for a drive. Literally takes 5-6 minutes per stop.

Just snugging them up would certainly help over giving them the beans every single time.

Now I just gotta figure a workaround for being a 20 minute roundtrip from anything I can do 80 on. Adjustments in the truck stop parking lot I suppose.

 

[mrblaine]

Just snugging them up would certainly help over giving them the beans every single time.

Now I just gotta figure a workaround for being a 20 minute roundtrip from anything I can do 80 on. Adjustments in the truck stop parking lot I suppose.

That's what we do, take the tools, pull off into a parking lot next to the freeway, adjust, go drive.

 

[Bud125]

You are reducing the constraint by half. That will let it move under load and may give a false adjustment for vibe mitigation. What most miss is the jam nuts only have to be snug, a proper wrench, you crawl under, takes a minute to pop all 4 jam nuts loose, grab both at the same time, turn both at the same time, snug the jam nuts, go for a drive. Literally takes 5-6 minutes per stop.

And what is the best wrench or wrenches for the jam nuts?

 

[mrblaine]

And what is the best wrench or wrenches for the jam nuts?

The ones that fit. Sadly, very few off the shelf wrenches actually do. What I have done is buy the large HF junk set, and then carefully take a hard disc on a grinder to one flat and open it up to fit. I have several like that because even the same size jam nuts vary in size between right and left hand.

 

[xXDavidCXx]

I just use a crescent wrench

 

[06TJ35's]

The ones that fit. Sadly, very few off the shelf wrenches actually do. What I have done is buy the large HF junk set, and then carefully take a hard disc on a grinder to one flat and open it up to fit. I have several like that because even the same size jam nuts vary in size between right and left hand.

https://www.amazon.com/dp/B0D96TCS8G?tag=wranglerorg-20