55.2-59 New to the 47-59 Trucks

[_Ogre]

Technically I'm _ogre, my build thread is in my signature
The 3400 ½T LWB frame and the 3600 ¾T frame are identical. They are the same in the FAM Factory Assembly Manual, all documentation refers to the 3400 & 3600 frames together. I strongly recommend buying the fam from any vendor if you chose to build a TF truck.
All mods done for ½T trucks can be done to the ¾T trucks without any modification. If you lower your truck, definitely C-notch the frame over the rear axle. TRUK has approx 3" c-notch but could have used more. Rubber bump stops and air shocks keep it off the frame in all but extreme cases
I'm snowbirding in Texas for the next 4-5 months and have limited brain power on the beach, but I do check in every few days