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Re: New spring perches, larger hole size [Re: dvw] #2763045 04/12/20 01:14 PM 04/12/20 01:14 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	Iso spring perches were made with a 1 1/2" center hole. The MP perch with a 5/8" center hole was originally a Dakota application (3/8" spring center bolt). Installing them on a passenger car 5/16" center bolt is a non-issue because this bolt locates the shock plate, and the shock plate locates the rearend housing via U-bolts tight against both sides of the spring perch. I carry special 5/16" center bolt spacers, however. Contact info

Re: New spring perches, larger hole size [Re: DoctorDiff] #2763129 04/12/20 05:11 PM 04/12/20 05:11 PM
Joined: Mar 2006 Posts: 9,833 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,833 MI, usa	Ya, I missed the Iso diameter by a ton. Doug

Re: New spring perches, larger hole size [Re: dvw] #2763176 04/12/20 08:04 PM 04/12/20 08:04 PM
Joined: May 2004 Posts: 853 Brisbane Australia 5 572B1 super stock
572B1 super stock 5 Joined: May 2004 Posts: 853 Brisbane Australia	I purchased a relocation kit in the nineties and it came with the large holes in the perches. we used two drill a 1/2'' hole in a flat plate and fully weld it to the perch. this lowered the car and fixed the large hole problem.

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