You have to understand the center of gravity in a vehicle and how moving the weight around effects that. I wish I could explain it better but I am far to tired and lazy to explain it. HaHa.

Which D-max are you referring to because the bars will be different in a regular cab long bed Vs. a Crew Cab ????

 

The vibration is in the rear suspension, it's like a small quick oscillation that starts when I hit a bump. It's not a rattle or anything loose on the frame or anything like that. I'm struggling with how to describe it, shudder is the best word I can think of but it's still not a good one. It basically feels like when I hit a sharp but small bump, there are 2-3 other small bumps afterwards. I feel it through the seat. That's why I was thinking it was a stiff rear spring or shock, which is why I am confused about why it got worse with no shock at all.

 

Are you sure that's not a gerbil or a pocket rocket???

 

I can understand this for large bumps that actually cause the suspension to load and unload and causes the frame of the truck to start to move up and down, where I'm having an issue is with small short bumps like expansion joints that are large enough to feel through the tires but not necessarily large enough to cause the body/frame of the truck to react. I don't get the feeling that there's a lot of suspension movement going on when I go over these. Maybe I'm wrong, I dunno.

CCSB is what I was referring to.

 

LMAO

 

The 2WD ext cab 06 Spring Special and the 05 VHO trucks in my possession both have labels on the bars.

LYT on the Left and RYT on the Right.

LYT 15072933
RYT 15072934

A quick Google search shows "CODE YT MAX TORQUE 7267"

I wonder how these would do in your truck?

 

your springs are over worked right now just parked, they will transfer anything you hit.

have to try and see it as a scale sorta like a triple beam. you now have so much weight up front that no matter what it will offset the rear. since your current springs have all their energy being used trying to hold your truck up they have nothing left to help with any bumps. if you hit brakes they are struggling, if you hit a snail they struggle....

you added about 500lbs to front of truck and your front springs rate just arent up to task honestly, you need a way to control that weight and only way is proper spring rate. You will need a RCLB spring rate of a dmax truck....this will get you closest

a CCSB will have a different rate since truck has weight differently then a RCLB

its a balancing act that right now, instead of barely using energy your springs energy is being used to just to keep ya upright vs doing its job when hits bumps

 

Lets try an obvious one, are the front or rear riding on or really close to the bump stops?

 

front is barely touching the bump stops yes. I don't think that's an issue though because that's how the factory design is, and the front is too soft right now if anything anyway. On the rear I am not touching the bump stops, I have about 4 to 5 inches of travel available.

I did some searching and it looks like I can pick up torsion bars really cheap from a couple of local scrap yards. Just have to decide which ones to get. I wish I could do the coilovers now, money wise it's just not a possibility at the moment.

 

Did some quick calcs and I think I'm going to want something around the 7000 mark for max torque.

GG = 6707
GH = 7161
WZ = 7267
YT = 7267

Anyone know how to find out which trucks these bars came on? When I look at car-part.com they just list whether the truck was a 1500 or 2500, nothing more than that, and there are no codes on the listings.