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I recently bought my first truck it's a 1998 c1500 ext cab has anyone ever installed a 4 inch spindle lift what size tires could I fit
 

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GMFS Enforcer
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I have installed a 4" spindle lift. With trimming you can fit a 33s. You cannot use a rim wider than 8" or a backspacing less than 3.5" (offset more than -1/2" or -12mm). If I were you, I would see about installing a subframe kit. There may be a few 7.5" fabtech kits still out there, and I know BDS made a 6" kit. The spindles are awesome, but you will only want to go higher.
 
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