Ok, as promised I'm back with an update after installing my ASFIR transmission skid. Overall, I think it's going to work out fine for CAT protection. There were a few issues as described below. This was my experience with a completely stock 99 LX, there may be slight variations with other installs that used spacers to clear sliders, etc.
Looking from the driver side:
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Passenger side looking forward:
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There were two fitment issues I encountered. The first is the front of the "ears" on the skid interfered with the torsion bar bolts on the lower control arms. The plate bolted up just fine, but it wouldn't have been good if I hadn't noticed. Of course I worked back to front so didn't realize it until I had it pretty much all the way on. I then had to take it all back off and grind that back a bit. The pictures below are after grinding, the ears on the skid plate were just touching the torsion bar bolts before:
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Finally, the driver side rear mounting hole wasn't drilled quite in the right place. I tried every version of installing all the bolts loosely, I even tried installing this bolt first and working away from it. Next time I'm at the hardware store, I'll pick up a metal grinding bit for my dremel and slot it out a bit more so it fits better. This was the only mounting hole issue, everything else lined up just fine.
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So, overall I think this is a pretty good off the shelf option for cat protection. The install was fairly easy, the issues I had were easily overcome, and hopefully this will make the thieves move on to an easier target if they try my truck again.
Should definitely help. Only thing I would change would be to use a bolt with a less common head (hex). Go with a Torx/Star Drive.
Thieves would be less likely to have that with them or to come back later.
I know the 'idea' is to create a situation where too much time/effort is involved for the thief..... but some are dedicated. Hate to see you lose your Cats and your skid plate (scrap aluminum bringing $1.25 a pound some places).
I'm sure the vast majority of these thefts are predicated on the thief being able to saw the cats off quickly and make good their escape (all done a minute or less). But in some situations ( a vehicle left someplace overnight) all they would need is five minutes.
Can't guard against everything....I know. But I'd take every measure to make it more difficult if I were going to make the effort at all.