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i asked my mechanic about the tb's on my old 1/2 ton he said u can crank them up IF you turn them back 1/4 - 1/2 turn from all the way. Ouch that looks like what the 33's did to my 1/2 ton after a hard day of wheelin
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1990 blazer 2wd 4.3
4"drop blocks, 2" drop springs, 2" spindles
2Audio Bahn competition 8"in custom box, and a 400watt clarion amp
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Hate to tell you man, but i have an 01 blazer (not a ZR2) with 31's on the stock 15 inch rim with no rubbage. And i get asked all the time around here in NC "IS THAT A ZR2? IT LOOKS AWESOME" i've debated on slapping a ZR2 sticker on it to up the value of the truck when i decide to sell it.
I have the same problem as Hanr3. 31 inch tires did that and got little chunks taken out of them from the fender. Torsion bars are cranked but they still rub when off-roading.
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2000 Blazer LS 4x4 4.3L vortec 4dr
Dynomax catback exhaust, Hypertech PP III, Granatelli MAF, 31's + 2 inch lift