The 57-68 early passenger car and half-ton pickup rear end is considered a medium duty unit and came in both 28 and 31 spline axles. The 67-73 Mustang type is considered light duty uses both axles. They range from light duty to extreme duty but in all cases the larger 31 spline axle versions are stronger than the 28 spline version of the same unit. Strength - There are four usable styles you can find in a junk yard. Two large holes and counter-sunk center = 31 splines.ĥ7 - no dimples, flat center band up the center of the rear cover, bottom drain plug.ĥ8-59 - two dimples on back of housing, flat center band, some had drain holes.Ħ0-67 - two dimples, flat center band, oil level hole in back cover.Ħ3-77 Lincoln, LTD, Thunderbirds had 9.375 inch centers, housings were cut away at the gasket surface for ring gear clearance, one curved rib at the front top portion of differential, strong but no aftermarket gear sets. How To Recognize Nine Inch Housing Centersġ957 - no dimples, flat center band up the center of the rear cover, bottom drain plug.ġ958-1959 - two dimples on back of housing, flat center band, some had drain holes.ġ960-1967 - two dimples, flat center band, oil level hole in back cover.ġ963-1977 Lincoln, LTD, Thunderbirds had 9.375 inch centers, housings were cut away at the gasket surface for ring gear clearance, one curved rib at the front top portion of differential, strong but no gears.ġ972 and earlier 31 spline axles have the ability to be shortened.Ģ8 spline axles are tapered and cannot be shortened and re-splined.ġ973 and later cars have a 5-on-5 bolt circle and the axles cannot be shortened.ġ967-1973 Mustang axles can be identified by wheel flange: Ranchero/Torino - heavy duty thick wall housing, 3.25 inch diameter axle tubes with flat tops.ġ969-1977 Galaxies (coils), Lincolns (coils), and late pickups (leaf)- 3.25 inch diameter all the way to the backing plate, coil housings have upper control arm mount than you'll need.ġ967-1973 Mustang, Torino, Ranchero, Fairlane 59.25 inches toġ957-1959 Ranchero and station wagon 57.25 inchesġ967-1971 Comet, Cougar, Mustang, Fairlane 59.25 inchesġ966-1977 Bronco 58 inches 5-on-5 1/2 inch diameter bolt circleġ967-1973 Torinos, Rancheros, Fairlanes 59.25 inches orġ967-1971 Comets, Cougars, Fairlanes 59.25 inchesġ967-1973 medium and big block Mustangs and Cougars 1966-1971 Fairlanes, Torinos, Montegos, Comets, and other Ford intermediates with big blocks.ġ967-1973 Mustang/Cougar - light duty, thinnest housing material, small axle bearings, 28 and 31 splines.ġ957-1968 passenger car and 1/2 ton truck - medium duty, stronger than Mustang type, 28 and 31 splines. So, you can run 75 mph at 3000 rpms (if you can afford the gas, that is).Here is probably more info. For example, 1600 rpm on the tach is 40 mph, 2000 is 50 mph, 2400 is 60 and so forth. 025 times (or 1/40) your rpm in mph (if your transmission's high gear is 1:1, of course). In fact, that combo of gear and tire gives you exactly. I also run a 3.31 with 275/60-15's on the rear and my engine is taching exactly 2800 at 70 mph(actual via gps). Running a 28 inch tire certainly would give you another 4-5 mph on the highway.Īccording to the comparison tool, changing from a 255/60-15 (27" tall) to a 275/60-15 (28" tall) will increase your speed 3.5% at any given rpm. I wouldn't want to go on any long trips with that gear and no overdrive, but its great for winding backroads, around town, and a quick blast on the highway. BUT, on the highway I cruise at 3000-3200 rpms and I'm in the slow lane doing just shy of 70 mph, getting past by campers - everybody does 75++ around here.
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