My 37 truck is similar,I used monoleafs on the front, disc brakes and a steering box from a 41-47 GM truck.I have a Patrick's sway bar on my 51, looks like it'll fit the 37 with a little work.
The 41-47 box isn't exactly fast ratio or power, but it's a nice bolt in upgrade and the monoleafs lowered the truck about an inch and a half.I did add 2 of the longer leaves from the stock springs leaves to the mono leaves, I felt they were too cushy.
The disc brake kit was easy to do, that was 7 years ago, the kits now are better engineered.The truck has manual discs, in my opinion, power discs are overkill on the light truck.
