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i never did any lifts on trucks,but i've been wanting to put a lift on my truck..i did some searching and i would personlly go with the blocks..
 

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i just put a set of 315-75R16 Maxxis Bighorne MT on a 04 2500HD GMC LB7 C/C S/B and they rub with the torsion bars all the way up so he had the bumper moved forward about an inch and his problems went away...it looks a little different like that i would go with the lift and be done with it..the truck comes stock with out blocks and yes they will work just fine with that setup..just my opinion
 

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ive lifted quite a few chevy's. there is no way you can run a 315 on a stock chevy with the torsion bars cranked up all the way. a 315 is equivelant to a 35" tire. you can run the 285 and maybe get a way with a 305, a 305 is just wider than the 285. but yeah those blocks that come with that kit will go on top of the stock block to get your 2 extra inches of lift. the keys will take care of lifting the front because they are designed different than your stock ones, where the ones on ebay there are getting you more adjustability. im wanting to do this to my truck also, but i dont like the fact of stacking a 2" block on top of my stock block, so i was thinking of going with a 2" add-a-leaf instead. thats how i got 6" out of my '94 half ton. it consisted of a 4" block with a 2" add-a-leaf. but let me know if you can stuff that 315 underneath it. cause i was thinking about seeing if they would fit with that 2" lift, but my original decision was to put 305's underneath it.
 

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I have 315's on a 34.5" diameter, and stock keys, with room to crank further. Hundreds of people have done this. It is NOT a problem. A tiny bit of trimming on the front dam. No rubbing. And the CV joints will not be near as stressed, as the green keys will make them. The keys are a sure way to cause yourself future wear issues, a close look at the geometry, and you can see that the torsion bars are also stressed more. The pogo ride that is induced, requires further mods to prevent shock topout failure, which is common with people who don't know what they are doing.

There is no stock removeable block either. Get the tapered 2" block if you are going to do this, though the leaf method is better, but you might be surprised at how high the rear will be with nothing .
 
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