A while back i read a post about changing the fluid in the rear shocks.
I thought it made sense, so why not do it. I personally took a different approach to it.
the stock shocks have something like 5 wt in them and to acquire a firm ride use 10 wt.
i chose to use shock therapy from Amsoil.

1) I removed the shocks.
2) then i put some long screws in the wall of my garage and hung the shocks from them
upside down with some plastic whip cream dishes below them. in a couple days they were emptied out.
3) measured the fluid out of each of them (6 oz. in one 8 oz. in the other)
I was also amazed by how dirty the fluid was.
4) pondered the hell out of how to put the fluid back in, the post i read was to use a press. i come up with a faster way and in expensive way.
5) screwed a short 2x4 to the wall about 1" above the shock height. then used a 2x4 about 2' long as a lever to work the shock up and down to get the fluid back in.
i used a large syringe tube to put the fluid back in the hole.


i have not used them as of yet but i will report how they work out.
i am going to lower my front end and plan on using the same fluid there also.
i will add photos later to this post for reference.

 

I got a set of 54631-02B Low profile Touring Shocks from a member here and installed them. Rode like a log wagon so I decided to change the fluid in them.

I ordered 5wt shock therapy from Amsoil and it came in quickly. Nice people to deal with, I even got a thank you card weeks letter for the order. First for me.

Removed rear shocks and air fittings and put upside in bucket for awhile and very little oil came out. So I placed the shock between trailer hitch on my truck and a floor jack. Jack the jack up just enough to keep the shock in place and then I bounced on the rear bumper until all the oil came out. This worked well and did not take much time at all. Did make a mess in the driveway though.

Reversed the shock and added 10.5 oz of 5wt shock therapy back in each shock. I used a small turkey baster like a funnel and added an oz or so at a time. Had the wife stand on the back bumper and put oil in turkey baster and wife bounced on bumper a couple of times until oil went in. Took a little time but got both shocks filled to 10.5 oz.

Put plumber tape on fitting threads and put shocks back together. Tape did not hold the oil and air in because when putting the fittings back on, the tape was just pushed out of the threads. Used plumber paste that I had left over from installing a hotwater tank and that did the trick (I check the air presser in the air shocks about a week later and it was holding).

Rides MUCH better, but still not as good as the 13" stock shocks did but I can live with it.

 

Based on these posts I decided to try this with the stock 13" HD air shocks for a 2009 FLHTCU.

How has this change been working out in reads to improved ride.