got a link?
The only one I knew of was the bolt on kit Full Traction Kit.
It worked, but known problems were this:
Still have to upgrade steering. (MORE kit runs around $500)
Still need rear traction bar. SOA is great, but develops a ton of Axle Wrap. Traction bars are necessary to prevent. (Sam's off road: $299)
Then lastly you have the one problem with bolt on kits. It gives you brackets for using stock axles, so using a Dana 35 and then lifting it it will usually net you 5.5 inches without lift springs. So most guys want to jump to a tire size that matches, and then combine wheel hop if there is no track bar and the axle goes pop very quick.
However, that is not the main complaint I have heard, the main complain is that it does not allow any changes of pinion angle. Being it clamps off the lower mount, and then transfers that platform to a new upper mount and (c-clamps the axle) you loose the ability to dial in your suspension with ease like a weld on perch would. You can still use shims, but a lot of guys were freaking when you mix all those bolted parts, and still use shims that often loosen on their own anyway
The cheapest way out I have seen is to do it the regular way:
Stock Springs, or RE SOA springs with reverse eye, or BDS 2.5 spring (if RE springs add another $595)
Sam's Track Bar: $299. Or MORE's : $225.
Steering Correction Kit:Â MORE's: $670.
It is usually easier to cut off what you already have, buy new weld on spring perches and thus you can get them longer for SOA to lessen wheel hop.
Cost: $90 for F&R. New shock mounts, cheap...
and then most guys want to make better uppers mounts to prevent shock bind against frame with long travel. Cheapest is Ford F150 mounts. Or you can get a full out kit with all parts: $307.
So, if you can cut and weld, and use stock springs, you can get away with a kick ass system for $1000, to $1200.
And if you can weld, I would think you could get a shop to do it for $300 or so....
Best part is welding them on will allow you to adjust everything perfect, get your pinion angle perfect, etc...