Lifetime Premium Member
Date registered: Sep 2006
Vehicle: Kleemann Headers , PTE Cams , 05 ML-500 SE
Location: S.E. Florida
Mentioned: 1 Post(s)
Quoted: 32 Post(s)
Rear suspension coil over Install
1 year after installing new Bilsteins BE- 2985 mated to H & R progressive rate lowering springs ( 29497 HA ) I couldn't find the ride height to suit me. And match the front ride height with the right body Rake for good appearance . So I thought I would follow sgtpepperaut lead in this mod. He was very helpful with what he purchased and the how's & Why's he did not keep them on his ML.
The ride of my set up was not too stiff or bouncy soft. Handled well , even over large / long speed bumps at 25 mph. I originally wanted to lower the ml about 1.5" , but it came out over 2". I built some 1" steel spacers to put under the lower spring seats that came with the Bilsteins . It increased the lift about .75" , but collapse the soft part the progressive H&R spring more that I cared for. I know ? what & why am I doing this anyway? Well, my girlfriend is 98lbs small frame with bad arthritis. She can not climb up into the ML at is stock ride height. Then there is the great safety factors of the ML. Full Box frame , very good handling. A well engineered truck
So I ordered from Summit Racing , 2 Allstar performance Adjustable sleeve kits P/N 64143. They fit over the 2" Bilstein shocks . and are counter bore to rest on a cir-clip fitted to the lower part of the shock tube. I preassemble & Measure to find the correct spring length for this application. In the process , I noticed that there was more adjustment screw thread to raise beyond needed suspension travel. So I counter bore another .500" inside the sleeve kit , to give the ability to lower more that the current setup. Now the sleeve is more centrally located. Next , I borrowed a set of race Scales. and set about weighing the 4 corners of the ML. I made sure I had at least 1/2 tank of Gas during this . I found the ML pretty well balanced Please see the Picture. Much better than most small trucks. You can see where the battery adds to the front right side LBS and the gas tank adds to the Left rear LBS.
So I go to the HYPERCO web site & plug in the numbers , said I need to use the 12" long 500lbs springs ?? Now Sgtpepperaut suggested I go to a 650Lbs spring, he felt the 800 Lbs spring was too taunt and added up to a very stiff ride. So I call Mark At Hyperco He plugs in the numbers and asked about the un-sprung weight of the suspension added together . So off I go , back to the ML and start weighing parts. The wheel & tire is 73 Lbs !! by itself . Now Mark redoes , the numbers & comes up with a 800 lbs spring. 12" long. and this is what Sgtpepperaut had used to start with . So I select a 750 LBS spring for both sides. Hoping to fall some where in-between. I think I've selected the right spring , What may have contributed to a Harsh ride was the shock Valving
Bilstein performance shocks!! calibrated for a ML-55 AMG. I now have the ML back together The shocks already had 20,000+ miles so they have softened up in my opinion. The right is not stiff . and is more supple that my friends w-164 / 2008 320 CDI ML with normal factory coil overs . Again Many Thanks to Sgtpepperaut for his help.