5100s 2.5 vs 1.75

i have the rear tsb and mine set at .85 and im perfectly level :/ ...thinking about going 1.75 with tsb aal though

 

Wow

 

I'll have to look into this. Are there differing AAL heights? If so, what height did you use? What height of 5100's did you use?

My truck had 50K miles and sits/rides level. It's not bouncy in the back, but it is SOFT.

I have the Toyota Extra Care extended warranty so that might help me with the TSB. If they give me the TSB, I will probably go that route with 5100's.

Any other advice?

 

At what height do you have to add a diff drop, shims, carrier bearing drop? I will admit I am a newb, and have been lurking for about a year now. I thought that 3" was the magic number for worrying about vibration issues?

you guys that are set at 1.75", have you added diff drop, carrier bearing drop or have you had any vibrations issues?

 

FWIW I have my 5100s @ 2.5 and the TSB and have no more vibes than stock. I lowered the carrier bearing (cost = $3) and after greasing the driveshaft, have no vibes worth mentioning (had more of the 26mph vibe when stock....)

 

Depends on which type of vibration issue you have when you lift the truck. The vibration I suffered would eventually be felt without any lift at all. There's enough of us out there that have bad bearings in the front differential, only you don't discover it until you lift the truck. There are those that have it before hitting 30K miles, others that have had their front diff replace more than once (in less than 50K miles), and then those like me that didn't know it was a problem until changing the front end height with the 5100s (I had almost 90K miles when I first lifted it). That's usually when you discover that bad differential bearing. With that said, it wouldn't hurt to get the diff drop just to reduce the risk of a future problem, or at the least extend the life of that one bearing that fails all too frequently.

FYI, my vibe was very bad at the 1.75 setting. 1.75 raised my front end up 2 inches. Could not only feel the vibe, but could actually hear it. So I'm now down to the .85 setting (which has the front end 1 inch higher than stock). Even at that setting, I still had the vibe. Couldn't hear it anymore, but could still feel it...it was a lot better. Installing the 1" diff drop put the angles back to stock. No more vibe. I'm not trying to scare anyone here, but if spending $40 will save you a lot of grief down the road, do it!

 

I didn't want too much lift, so I went with the Wheeler's 1.5" (I believe Toytec makes a 2"). I have a hard tonneau on mine, and 1.75 in the front levels it nicely. But I had to lower the front down to .85 due to a bad front diff bearing (see my other post above). Still, it doesn't look too different than stock rake with my tonneau on. I have to say, there's no such thing as a harsh ride with the tonneau, AAL, and 5100's. Feels smoother than it did when I bought the truck.

 

I was just about to ask about the ride per AAL+billies and a tonneau. Very useful info here, thank you.