I do believe the 4600 series is the yellow shock for the super duty .
Spend the extra $ for the 5100
Believe me you will not regret it .
Kinda like running a set of toyo tires on a super duty . They are great . Compared too running the BFG T/A. Although I love em they just don't hold up on the superdutys

 

That's total BS, the 4600 and 5100 are pretty close to the same shock, the 5100 series is made for lifted truck applications, I and a ton of other guys run the 4600 shocks on Superduties without any trouble whatsoever.

 

Call it what you want . I sell beilstien at my shop . And Arizona has some of the harshest conditions in USA. The 5100 are stainless bodied and they are not just made for lifted trucks .We install them on every JCP&L truck and SRP . Bone stock trucks . The 51000 also had 2 extra valving chambers 1 on rebound and 1 on compression . It's just a better shock . It's not BS it's fact . You can run the 4600 but I just gave you an honest answer .
Truth hurts alot of people that don't want the truth .
Either one is fine depending on your application . But the 5100 is just better all around especially for heavy loads , off road and extreme lateral flex.

 

I don't plan on any off roading but I do plow and tow a large 5th wheel. I just want a better ride on road and better control when towong and plowing. Seems anything is better than the stock FX4 shocks. 5100's sound like a winner. I plan on doing the steering shock as well.

 

Go with the dual shock opposing type shock
Mine are Rancho and they blew out in 9k miles

 

Some of you guys just really need to quit arguing...

Bilstein 5100 vs Heavy Duty 4600 - Shockwarehouse.com

 

We are all ford guys here !!!

 

Yup, says the 5100 can be used for stock height to 2 inches of lift. Since my truck has the plow prep package and sits slightly higher in the front, I think Ill go with the 5100.

 

You will love em
And that zinc coating on them really stops the rust from coming
Good luck .
Fords forever

 

What shock will give me the softest ride possible? Rancho adjustable? I tow very light. I have the FX4.

 

No the beilstien' share definitely a better ride .
No question about it . They are a high quality gas charged multi valved.
Just a higher quality shock .

 

The 5100 series? I have read they are a very stiff shock, but haven't had them before. Truck rattles my teeth out on even the slightest bumpy surfaces. A Carli upgrade is rather expensive.

 

I call your shockwarehouse and raise you one, straight from Bilstein themselves> Understanding BILSTEIN's Product Line

 

What is a Carli upgrade ?
Not familiar with that ..

 

If you got the coin.....
http://www.carlisuspension.com/ford-...ommuter20.html