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Definitions of Terms |
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Home |
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Different Yoke Styles - Large 7290 2 5/8" inside tangs |
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Small 7260 - 2 1/8" inside tangs |
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Different U-Joint sizes - Large 7290 3 5/8" (3.650") across the caps (1.125" bearing caps) |
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Small 7260 3 1/8" (3.130") across the caps (1.078" bearing caps) |
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Cases, Different case numbers Casting Number 1820657 up to 1964 |
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(used keyway to attach rear brake assem. & a large nut on axle end) |
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Casting Number 2070741 1965 - up |
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(1965 started using flanged axle shafts) |
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Casting Number 2070742 1957- 1968 |
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Casting Number 2881489 1969 - 1974 (Tapered Pinion) |
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Pinion sizes 742 casting - 1.750 Diameter |
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489 casting - 1.875 Tapered |
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741 Small - 1.375 Diameter |
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Ring gear sizes-both 742, 741 and 489 case 8 3/4" |
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Dana 60 case - 9 3/4" |
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Banjo-type axle assembly - Removable carrier (Front) 8 3/4" |
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This style preloads the carrier bearings using adjusters on the sides of the Carrier bearings. |
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The pinion is preloaded by use of a "crush sleeve" |
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Pinion height is achieved by shimming. |
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Carrier-tube axle assembly - Carrier removable from the rear (Dana 9 3/4")
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This style preloads the carrier using shims either behind the carrier bearing or between the case and the race. |
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Pinion height is achieved by shimming. |
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Pinion preload is achieved by shimming. |
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The Dana 60 was used starting in 1966 with 4 speed and other H.D. applications. From 1966 - 1969 the case was called "Power-Lok", from 1970 and up it is called "Trac-Lok". The early "Power-Loc" is much more desireable for racing and HD applications. |
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8 3/4" carriers 9 3/4" Dana carriers |
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Torque specifications - Differential bearing caps 75 ft. lbs. 80 ft. lbs. |
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Ring gear to case 75 ft. lbs. 80 ft. lbs. |
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Drive Pinion flange nut 250-275 ft. lbs. |
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Backlash .006" - .008" .004" - .009" |
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Pinion drag torque (without seal) 10 - 20 in. lbs. 10 - 30 in lbs. |
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Note: use the high side of the backlash specification when application is drag race only. |
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Super Stock Spring Segment Lengths |
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Front Segment Rear Segment |
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20" 35" |
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Production Leaf Spring Segment Lengths |
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Body Type Front Segment Rear Segment |
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60 - 76 A-Body 20" 35" |
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62 - 63 B-Body 20" 35" |
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64 - 65 B-Body 21" 35" |
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66 - 79 B-Body 22" 36" |
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Axle Width Chart |
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