FJ40 Frame Boxing Kit!

Dan Fredrickson

Supporting Vendor
 
Joined
Sep 13, 2005
Messages
853
Location
Sacramento
We have been making these for 10 years now, time to stiffen up yours!

These are Reinforcement Plates to box the rear of your FJ40, they are .1875" (3/16) thick Steel Plate. Made to strengthen an inherently weak area on an FJ40, opinions differ on whether or not Boxing the frame should be done so do your research. We believe the frame should be stiff and the suspension should be doing the flexing. Flexing the frame loosens the rivets and slowly tears it apart. This comes with a 1.75" x .120" replacement crossmember with 4 predrilled placement options, one of the holes is at the stock position and the others are spaced 3" on center, one in front and 2 behind the stock position. If you are adjusting your WB way back we would recomend 2 Crossmembers to retain the structural rigidity gained by the frame boxing itself and the Crossmembers provided are long enough to allow mounting through the existing frame also (just drill 1.75" holes through the frame using the Plates as a guide). These are designed to fit within the frame itself so you do not have to remove the tub to install, however you do have to remove the factory Crossmember and mounting plate and reposition the rear brake line. The short angled plates are made 1/8" long to allow for movement that has already occured. Welding Required!



FJ40 Frame Boxing Kit
 

Dan Fredrickson

Supporting Vendor
 
Joined
Sep 13, 2005
Messages
853
Location
Sacramento
If you plan to ride your FJ hard and put it away wet, then think of these boxing plates as preventative maintenance. ;)
 
Joined
Aug 24, 2014
Messages
3,348
Location
Woodinville Washington
Funny, when I boxed mine during my build, Pirate folks told me I was an idiot and that the frame needed to flex.... in addition to those plates, I highly recommend welding the seam where Toyota boxed it. Rivets break and wear into oblong holes.

Of course, the proof is this. I don't have rattles. I don't have chipped or bent panels from hard use. I hope you sell thousands - it's a very worthwhile update.
 

Dan Fredrickson

Supporting Vendor
 
Joined
Sep 13, 2005
Messages
853
Location
Sacramento
As for the 60/62's We will need to buy one first...

I have 2 45's and we will be offering them in a limited fashion, a lot of 45 guys want to stay more stock. It will be a couple of months before these move up on the engineers list...
 
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