Compression Ignition Addict
Join Date: Apr 2012
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305s like Nick has are 33-1250 I believe
My 315s are 34.5x12.4 basically a 35
My rears on 6in wide wheels do not touch the outer 1.5 of the tread. As mentioned, they do not buldge in the middle too bad.
Another option for spacers are the arrowcraft. I'm pushing near 500hp range and have not had any issues. Although I only have 1500-2000 miles on them.
I am not sure if Freds are the same way but one thing I do not like about the arrowcraft is, you have to pull the axleshafts to mount them.
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03 F350 7.3L Auto CC LB Dually 410's (LS Rear)315's
PHP/Beans tuned, 250/100 FF inj's, BTS Tranny, Strictly Diesel complete fuel system w/RR & FB Delete, Pius LASB from Irate, Swamps hvhf IDM
Autometer Nexus Guages (TT,FP,BP,EGT), 4"MBRP, DieselSite Coolant filtration system/billet housing/HP X-Over line, Baldwin PA2818(6637) RR Boots, 26 row 6.0 Tranny & PS Cooler, LarryB's Denso Starter