If you want to run 38's on a 10 or 12 wide wheel with a 6" lift you will be re-shaping your front fenders off road,(and sometimes on road) . I have 35"s on 10 wide wheels with a 6" and off road it sometimes touches the fenders. You might get by with 8" wide wheels and 37"s with the zero rates all around with a 6" making it a 7".
If you are mostly on the street you can get away with less lift , but it only takes one time and your fender is trashed.Your wheel width plays a big part in messing up your fender's.
Here"s the way I would go,
35"s = 6" lift
37"s = 7" lift
38"s = 8" lift
Everybody has their favorite brand of leafs , so you will get mixed emotions on that. If you want bad boy custom leafs , deaver's are nice all around but if you want to go with the major brands , I like skyjacker's softride , but thats just me. A lot of guy's on here like tuff country , I myself have never ran them because when they first came out , (way back in the day) they were junk but people say they are good now.I have ran rough counrty , rancho , superlift , trailmaster , and pro comp springs in the past and I liked the skyjacker's the best for a good ride and taking a beating off road , aside from the deavers springs I have had (they rode the best).
I like the shackle flip set up for lifts , but dont let people freak you out about blocks in the rear , they work fine. I have had 0 problems with blocks and I have been trashing trucks in the mud , rocks , sand , etc... with big motor's for moons , hell even fords and dodges have been coming from the factories with blocks in the rear stock for moons.
Here is the blazer I am building ,
8" skyjacker springs with my own 0 rate blocks all around = 9" lift
38's on 10 wide wheels for everyday and 40's on 14 wide wheels for mud
cross over steering , 1" t-case drop , 8 lug , cut fenders a bit.
My girls truck, 1978 loaded silverado
6" skyjacker softride springs all around
35's on 10 wides
350 , 350hp roller motor , 4.11 gears , locked rear.
Figure out your tire/wheel size and if you want to cut your fender's or not and get her up in the air enough to clear everything and have fun
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