8.25 rear axle swap

[Kennyfishes]

Hello, so I’m looking for some guidance on a 8.25 swap. I’ve searched about every keyword on this Forum and can’t find anything in detail.

 

what are the measurements on where my spring perches and shock mounts need to be? Or what’s the best method to find these measurements, I want to make sure I’m doing it right the first time. TIA

[Pete M]

42 in center to center. Make sure you're not measuring off the center of the differential, because sometimes they're off a little bit. Shock mounts all dependent what you're doing.

[Kennyfishes]

42inch, Center of one spring perch to the center of the other?

How far from the plate should they be on each side?

[howeitsdone]

6 minutes ago, Kennyfishes said:

42inch, Center of one spring perch to the center of the other?

How far from the plate should they be on each side?

Yes and equidistant from the backplates.

[ghetdjc320]

1 hour ago, Kennyfishes said:

42inch, Center of one spring perch to the center of the other?

How far from the plate should they be on each side?

You’ll need to find the centerline of your axle and measure 21” away on each side. That mark will be the center of your spring perches. Keep in mind also that now is when you will set your pinion angle. If you’re using a standard or original style driveshaft, the pinion will need to be about 1-2* up from parallel to the ground. Here is a handy diagram: