Adding After Market Air Ride to Cab on 1986 W900.

You would think all that flexing would cause the bolts for the front mounts undue stress.

 

I think there is enough give in rubber mounts to absorb the flexing. Hasn't been an issue this far anyway.

 

I would call Cabmate directly and get the part number for the kit they recommend.

 

Can you post a picture of the front cab mounts? Some of the early W900B cabs
had the front mounts half way back under the cab. If you have that setup you
can't install an air ride.

 

Just invest 1200 on the seats pinnacle seat and be done with it. Its an amazing seat with dampner adjustment
Seats inc. Pinnacle seat . Best seat ever

 

Can you post a picture from the front of the right cab mount. Its hard to tell
from that picture. The mid mount cabs had the mounts located in the area
near the center of the door opening.

 

Yes those are the center mounts so you can't install an air ride.
I worked for a KW dealer when the B model came out and there were lots of
complaints about rough ride.
The rear cab mount bushings looks like they have some movement which will
cause a rough ride. The original rear mounts were soft 70 durometer 2 piece
mounts. Kenworth tried a couple different mounts and finally went with a one
piece Lord bushing that was 90 durometer rubber a harder material. They look
like the ones you have. any movement in the rear mounts allows the cab to move
forward and back harshly. I would try replacing the rear mounts first and see if it helps.