AMC Model 20

AMC Model 20
Chrylser, Dodge, Plymouth, Jeep
  • Ring Gear Diameter: 8.875
  • Cover Bolts: 12
  • Ring Gear Bolts: 8
  • Spline Count: 29
  • Dropout: False
  • Pinion Support: False
  • Carrier Breaks: 2.73 / 3.08
  • Rear Suspension: Solid
  • Pinion Nut Size: 1-1/8

Ring & Pinion Gear Sets
Part # Ratio
YG M20-331 [24521] 3.31
YG M20-354 [24522] 3.54
YG M20-373 [24523] 3.73
YG M20-411 [24175] 4.11
YG M20-456 [24176] 4.56
YG M20-488 [24177] 4.88

Spider Gear Kits
Part # Description
YPKC8.75-PC [16148] Powr Lok clutch kit, OEM posi only
YPKM20-PC-T/L [16165] Trac Loc clutch kit
YPKM20-S-29 [16126] Standard spider gear set, 29 spline

Overhaul & Install Kits
Part # Description
YK M20 [14108] Master Overhaul kit
BK M20 [11081] Bearing installation kit
PK M20 [13082] Pinion installation kit
MK M20 [12066] Minimum installation kit

Axle Bearing & Seal Kits
Part # Description
AK M20 [10039] Axle brg & seal kit, two piece axles, set 9 brg
AK M20-1PIECE [10040] Axle brg & seal kit, one piece axles, set 9 brg
AK SET10 [10042] Axle Bearing & Seal Kit, set 10 brg
YP CJBRG-SEALED [32129] Axle brg, old style moser 1-piece axles

Yokes
Part # Description
YY M20-1310-28S [41095] 1310 U/Joint, strap style
YY M20-1310-28U [41096] 1310 U/Joint, U-Bolt style
YY M20-1350-28S [41097] 1350 U/Joint, strap style
YY UB-002 [41198] 1310 U/Joint U-Bolt kit

Shim Kits
Part # Description
SK 25300 [55009] Pinion depth shim kit
SK 30214 [55010] Carrier Shim Kit
SK M20-3 [55060] .003" Axle end play shim
SK M20-5 [55061] .005" Axle end play shim

Small Parts
Part # Description
YSPBLT-010 [33040] Ring gear bolt
YSPBLT-075 [33286] Cover bolt
YSPCS-002 [33085] Crush sleeve
YSPPN-012 [33146] Pinion nut
YSPSTUD-011 [33181] Axle stud
YSPTW-013 [33283] Side gear thrust washer
YSPTW-031 [33301] Pinion gear thrust washer
YSPXP-027 [33332] Cross pin shaft
YSPXP-029 [33334] Roll pin for cross pin shaft
YSPXP-061 [33535] Axle spacer button, standard & Trac Loc

Traction Aids & Spools
Part # Description
YP FSM20-3-29 [32049] Steel spool, 3.08 & up, 29 spline

Covers & Cover Gaskets
Part # Description
YCGM20 [23025] Cover gasket
YP C1-M20 [32019] Chrome cover
YP C2-M20 [32031] Polished aluminum cover

Seals
Part # Description
YMS470331N [30079] Pinion seal
YMS7687S [30175] Inner axle seal, set 9 bearing
YMS8549S [30190] Outer axle seal, set 9 bearing
YMS9912 [30218] Outer axle seal, set 10 bearing
YMS51098 [30117] Inner axle seal, set 10 bearing