Need a little suspension help

[ballzac86]

I've had the truck lifted for a while now, but until recently never carried any weight in the back. With or without weight in the back, the truck tracks perfectly straight, but the rear of the truck will jump sideways if I hit a decent sized bump. With weight in the rear and going highway speeds, the rear end will start floating back and forth. To stop the floating, I either floor the gas, or let off completely. Only seems to happen with weight in the back though.

The setup:
Front
-TRD Tundra coils
-Bilstein 5100 adjustable

Rear
-LC coils(not sure how many wraps, sits pretty even with the front)
-Bilstein 5125

Tires are Firestone Destination A/T 265/70/16, tire pressure is not an issue.

I realize a pan hard drop would "help," but would it cure the rear floating at highway speed? I'm thinking I may need to switch the shock/coil combo, but not sure. Opinions?

 

[AZTOY]

Check sway bar connections. Control arm connections.

 

[GottaBeTRD]

I just got the same set up in the rear, I'm not sure if i'm just feeling the softness of the LC coils or if the rear end is actually floating. I feel it at lower speeds.

I think this is what the panhard drop is for?

 

[shadow247]

I just got the same set up in the rear, I'm not sure if i'm just feeling the softness of the LC coils or if the rear end is actually floating. I feel it at lower speeds.

I think this is what the panhard drop is for?

Yeah I noticed some squirellyness with the LC springs as well. I think a panhard drop would solve the issue, but it didn't bother me too much. I opted for the adjustable panhard bar as I did not want to make a permanent modification at the time. Now I've sold it all and put 1.5" spacers in the rear, the ride is definitely better, but not quite as good on the highway. The LC springs are nice and cushy for highway driving.

 

[GottaBeTRD]

tell me about it! it's a way smoother drive! Well as long as it's not dangerous then I'm ok with it until i can get some more stuff

 

[ballzac86]

Check sway bar connections. Control arm connections.

All connections are solid, sounds like the soft LC springs coupled with the soft Bilsteinsnand no panhard drop may be an issue? I may need to change the setup, rear end floating at 70+ isn't exactly "safe." lol