2005 F350 CC Diesel - 75,000 miles. Looking at upgrading shocks from the stock "rancho" that came on FX4 model. Reading a lot of good responses on Rancho RS9000XL shocks and noticed they are nitrogen gas charged. It's been a while since I did a skyjacker lift another F350. We used the nitro shocks with that one and in the winter the ride was completely different. Some people said the hydro shocks would have been better in Colorado. Any RS9000XL users in Colorado or other states with good or bad experience in the cold weather? Any 2005-2007 super duty owners with FX4 package that switched to the RS9000's?

 

Buy the RS900's, the ability to change dampening would make it easy to fit your needs. I usually sell to customers here the RS5000 just because they alone are worlds better then the stock Motorcraft branded shocks and have the lifetime warranty.

 

The nitrogen is sealed inside of a metal tube. Outside air pressure has no effect on the nitrogen inside of the metal tube.

 

The nitrogen is sealed inside of a metal tube. Outside air pressure has no effect on the nitrogen inside of the metal tube. Cold weather is taken into account when designing the shocks, so no worries there either.

 

I agree. Nitrogen charged or not would make minimal, if any, difference.

On the other hand, the oil in the shock will be thicker when cold - resulting in more damping and a harsher ride, and the tires will be stiffer and harsher riding as well. That's more likely what you were noticing.