I doubt you'll get 5100's at Autozone. You need top and bottom adapters for the front, and just top for the rear (the lower rear mount is already an eye mount).
Take a look at the bilstein website and see your options:
http://www.bilstein.com/index1.php
I think you need a bit more info. First off, doing this mod is going to reduce your up travel and give you more of a half up/half down balance. Most 80 suspensions are biased to up travel to accomodate the weight of full bumpers/winch and other heavy accessories, so if you run this stuff you may want more than OME heavy in the spring department.
The key is this: with this mod you want to balance your suspension travel about half up and half down if you are after rock crawling performance (IMO). That means 5" of shock piston showing when your truck is sitting level in a parking lot (on a 10" travel shock).
So you need to measure the distance between your upper and lower mount surfaces and subtract 3" (only subtract 2" if you measure from the stock or OME bushings as those are 1" thick in total up front and 1/2" in the rear).
Then look at the compressed length of the shock and subtract it from the number you calculated above and what you have remaining is up travel. Subtract up travel from total travel and you have down travel (duh
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So for example, if you have 24" between your upper and lower mounts in the front, without any shocks or shock bushings installed, then subtract 3" for the eye adapters from the 24" distance, giving you 21" to fit the new shocks. Now if you have a compressed length on the shock of 16" then that shock installed will be extended 5" and therefore have 5" of up travel and 5" down (assuming a 10" travel shock).
For the rear, you only subtract 1.5" since you only have one adapter.
This will work perfectly in conjunction with 35's and 1.75" to 2" bumpstop extension. But do your measurements so you tune this exactly as you want it with the right shock length. 5100's come in a lot of flavors, and you can go up from there if you have the spend and want to get high end on your shocks.
One other thing I want to point out is shock mount rigidity, which I believe increases substantially in an eye to eye mount due to mount style and decrease in bushing material. Pin style mounts with 1" of total bushing have a lot than can move around. When I first installed my suspension, I managed to leave one bolt on the driver's side rear shock tower loose, but the other tight. Just that tiny bit of movement had my truck bottoming out all over the place. Tightened it up and the entire rear suspension could handle high speed runs through those big intersection dips with total control. Seems to me that if you don't fully control the initial spring motion you are going to get a lot more overall suspension motion. Report back if you don't love this mod.
Nay
) What lift/tires do you have? what is the part # for you bilstiens.
