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Swapping Rear Axles & Spring Pads - E-Z...
Rear Axle Dimensions
2014 Mopar Event Schedule
Bangin Gears - Hello, My Name Is Johnny
Way Back - 1967
1977 Dodge Aspen R/T - Paper Tiger
Swapping Rear Axles & Spring Pads - E-Z Rear Retrofit
Weld-On Spring Perches And Axle Swaps Cure The Big Tire Blues
, Photography by
December 01, 2002
Basic Rear Axle Dimensions
Common Mopar Rears
Pad's Centers (in.)
B-Body '71-up SW
F-, M-, J-Body
*A-Body through '72 had the small 4-inch bolt circle and a shorter axleshaft offset for narrower A-Body brakes.
With the measurements done, the spring pads were cut loose. A cut-off wheel will do the job, although we swapped to a cutting torch for the other side since it proved to be much quicker.
With the measurements done, the spring pads were cut loose. A cut-off wheel will do the jo
Once the pads were cut, we ground the area flat to prepare for mounting the replacements.
The Moroso perches fit our axle tubes perfectly. Accurately measure the center-to-center distance, and measure each end from the flange to assure that both sides are exactly even.
The Moroso perches fit our axle tubes perfectly. Accurately measure the center-to-center d
Confirm the housing position at the pinion to make sure it hasn't moved, set the perch level, and clamp it in place. We fine-tuned the position with some light hammer taps until it was exact.
Confirm the housing position at the pinion to make sure it hasn't moved, set the perch lev
The perches were tacked in place with a MIG, and the rear was given a final check before we fully welded them.
The perches were tacked in place with a MIG, and the rear was given a final check before w
Our little 110 MIG wasn't manly enough to do the job, so we pulled out our Lincoln A/C arc welder and zapped it solid with a 3/16-inch 6013 rod at 200 amps.
Our little 110 MIG wasn't manly enough to do the job, so we pulled out our Lincoln A/C arc
Careful measurement paid off, as the rear lined up perfectly. It literally just dropped onto the locating pegs in the leaf springs.
Careful measurement paid off, as the rear lined up perfectly. It literally just dropped on
With the pads welded on, there was nothing left to do but install our new rear and check the fit.
With the pads welded on, there was nothing left to do but install our new rear and check t
The 11x2.5-inch brakes from our old rear are directly interchangeable for the 10x2.5-inch units on the E-Body rear.
The 11x2.5-inch brakes from our old rear are directly interchangeable for the 10x2.5-inch
The small change in rear axle width of about 5/8-inch per side was just the right amount to give the tire-and-wheel combo the perfect tuck in our Charger body.
The small change in rear axle width of about 5/8-inch per side was just the right amount t
Inside, the mod maintained plenty of clearance to the spring and inner wheelhouse.
Moroso Performance Products
Summit Racing Equipment
P.O. Box 909
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