I have a 17 sierra, just looked the other day, slight spot of rust where the jack/hoist touches the frame. Seems anywhere the wax coating is disturbed will rust very quickly. I had a 2015 Silverado, got a Krown oil undercoating done. never had any rust for the 2 years I owned it even with winter road salt. I plan to get my new truck done soon. Like already stated, it helps to regularly spray off the undercarriage especially if you live in an area that uses road salt. Highly recommend getting a rust proofing spray done. (not fluid film though as from what I have heard will melt the wax off all together)
You may be right, but I would hardly think the angle would be out too much with just a 2" block. really only lifting 1". I have heard on the 3" and up it can become an issue. Also, I have yet to find a 2" flat block, seems every brand is tapered except tuff country. But they only have 3" and up available.
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From what I have just been reading, I believe some of the above posters seem to be right. The drive line angles are supposed be be equal. I may go with flat block for only a 1" difference. Still tuned in for other peoples experiences.
I am also looking for info on this subject. Looking to get 2" rear blocks for my 17' sierra elevation but I am not sure if I should get flat or tapered either. I know the readylift and rough country are tapered. Tuff country makes some 2" flat ones. Don't want to add a vibration in a brand new truck.
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