Hello,
You might have a 4:56 because someone in the past may have swapped in a rear end from a B16 544 or 444.
There are many ways to tell if you have a Dana 27.
1st, a Dana 27 will have a "27" cast into the webbing of the center housing. The "27 can be seen by looking in the upper right corner above the rear end cover.
2nd, the ring and pinion will have Dana or Spicer stamped into the edge of the ring gear and the ring gear will be have 8 bolts.
Last year we installed a 3:54 ring and pinion in a 1963 544 with a Dana 27.
The parts, all of which were new or NOS(new old stock), cost $1000.00 and included the ring and pinion, a spider gear kit, carrier and pinion bearings, a carrier housing, and install kit which includes shims, pinion seal, cover gasket, ring bolts, and pinion nut.
Although a little sluggish off the line, he is able to keep up with his buddies with some pretty pricey sport cars from the 50's, 60's and 70's.
The aren't doing 100, but he can easily cruise at 80 and still hear the radio.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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