Originally Posted by eldudderino
Well I bought it a little over a month ago. It is a 1984 J20 with a flat bed. ...
Look on RockAuto -they list Dayton springs for these trucks. These are also available from spring shops elsewhere on the net, not necessarily under the Dayton name. I was thinking primarily as a replacement for the rears - these are not lift springs, and would return the truck to stock height if you installed them all around and without the blocks.
If your fronts have some arch, you could try removing one or a few of the shorter leaves. You'll need clips and a new spring center bolt to build the new pack, and you're supposed to replace the u-bolts after each use.
My feeling is you're pretty close to ok for 35s at stock ride height. Tire clearance is quite good for these trucks, and you'll have zero issues at tthe rear with a flat bed. A bit of judicious trimming at the front could also help. I would try some factory height rears with say 2" blocks, and less arch in the front.
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk