Page 30 of Mark Williams Racing Products by Mark Williams Enterprises, Inc.

9 ford spools the mw 9 ford standard and scalloped light weight steel spools are made from 4140 alloy steel forgings and cnc machined to extremely tight tolerances all steel spools are thru hardened using our inhouse austemper heat treating process this exclusive process produces a reliable highly ductile quality spool mw aluminum spools are produced from 7075 t-6 forgings and hard coat anodized for durability the bearing journals and ring gear flange on all spools are cnc ground on special fixtures that ensure perfect concentricity with the axle spline and zero ring gear run-out 9 ford standard spool .240.00 9 ford light weight spool .290.00 53140 53133 53127 53123 53128 53133 9 ford aluminum spool .225.00 9 ford aluminum spool .225.00 9 ford aluminum spool .345.00 53146 53125 stock 31 spline weight 4.9 lbs stock 28 spline weight 5.0 lbs aluminum spool 40 spline 3.812 bearings requires 3.812 bore case 57448xx series weight 5.5 lbs mw 35-spline 3.25 case weight 12 lbs light weight profile milled steel spool 40 spline 3.812 bearings with 1/2 ring gear bolts 3.812 case 10 lbs 53127 9 ford light weight spool .290.00 53135 43127 53136 9 ford aluminum spool .345.00 9 ford titanium spool .price on request 9 ford standard spool .240.00 light weight profile milled steel spool 40 spline 3.812 bearings 7/16 ring gear bolts 3.812 case 10 lbs aluminum spool 35 spline requires 3.250 bore case weight 4.9 lbs mw 40-spl l/w milled 3.812 case required weight 4.5 lbs mw 40-spline requires 3.250 bore case and large bore wheel bearing with proper housing ends weight 11 lbs 53137 9 ford light weight spool .290.00 mw 40-spline l/w milled 3.250 bore case large bore wheel brgs and proper housing ends are required weight 8.5 lbs 53138 53145 9 ford light weight spool .290.00 9 ford light weight spool .290.00 summers type 35-spl l/w milled weight 9 lbs dana spline mw 35-spline l/w milled for stock case 2.983 or 3.062 bore weight 8.75 lbs 53139 53140 53144 9 ford standard spool .240.00 9 ford standard spool .240.00 9 ford standard spool .240.00 stock type 28-spline weight 10 lbs mw 35-spline for stock case 2.893 or 3.062 bore 11lbs stock type 31-spline weight 11 lbs 53147 53148 9 ford light weight spool .290.00 9 ford light weight spool .290.00 strange type 35-spline dana splineweight 9 lbs m-w 35-spline l/w milled 3.250 case weight 9 lbs 9 ford lockers posi-tractions the 9 ford has several ways to go when an increased traction differential is required mark williams stocks several different types the detroit locker the truetracŪ the dpi gold track and the ford clutch posi detroit lockerŪ is offered for popular 9 ford applications 28 31 and 35spline these units are designed to provide power to both wheels even in those situations where one tire loses traction detroit lockers will also compensate for differences in wheel speed when turning corners by letting the wheel with the larger turning radius overrun and unlock from the other wheel the 35 spline unit is popular for pro-street application requiring a large axle spline and can be used for drag racing 187s-35c 187s-35c 57311 truetracŪ or gold trackŪ differentials do not use friction plates but rather the wedging action of separating spiral pinion gears this type of differential is unique in that it increases traction but does not affect the steering and there are no friction plates to wear it allows normal differentiation without adverse effect on steering or chattering when cornering only when there is a loss of traction will power transfer occur the worm drive differential offers moderate strength clutch posi-traction are the most common and are used in the original rears smooth quite action relies on spring pressure and friction in the clutch plates to increase driving traction quietest for street rod applications 187s-13a 9 ford 28 spline detroit lockerŪ .523.00 187s-17b 9 ford 31 spline detroit lockerŪ .523.00 187s-35s 9 ford 35 spline locker .827.50 billet steel housing requires 3.250 bore case 57231 57131 57311 9 ford 31 spline black gold .845.00 9 ford posi unit 31 spline .401.00 9 ford posi unit 31 spline .408.00 auburn cone type posi unit clutch type posi-traction motorsports type 187s-35c 9 ford 35 spline locker .606.00 nodular iron housing requires 3.250 bore case 30

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