Jconcepts sold a conversion kit to convert the BJ4 to BJ4 W.E which listed all the parts. One good thing I perfered with the BJ4 WE was that is could use a 78T spur whereas the BJ4 was limited to a 72T.
Parts Included:
Center CVD Kit
# 1135 - Center Drive Kit, MIP CVD Aluminum (kit)
# AE-3911 - Input Shaft Shims (3)
Center Slipper Parts
#
1120 - Slipper Outdrive - male (1)
# 1112 - Slipper Outdrive - female (1)
# 1122 - Slipper Plate Hard Anodized (2)
# AE-9603B4/T4 - Slipper Pad (2)
# AE-9652B4/T4 - Kimbrough Spur Gear, 78T (1)
# AE-6575 - Diff Bolt (1)
#
AE-6573 - Diff Thrust Washer (1)
# AE-6582 - Diff Thrust Spring (1)
# AE-6575 - Thrust Bearing Cover & Locking T-Nut (1)
#
AE-3911 - Outdrive Shims (2)
#
Avid3/8 x 5/8 Ball Bearing Rubber Sealed ABEC5 (2)
Miscellaneous Hardware
#
1108 - Front Suspension Sleeve (2)
#
AE-4334 - 2-56 x 5/16 Button Head Screw (2)
#
AE-7673 - 4-40 x 5/16 Flat Head Screw (4)
#
AE-6292 - 4-40 x 3/8 Flat Head Screw (4)
#
AE-6932 - 4-40 x 5/16 Socket Head Screw (8)
#
AE-6925 - 4-40 x 1/2 Socket Head Screw (2)
#
AE-6936 - *4 Washer, aluminum (4)
#
3mm x 8mm Motor Screws (2)
Aluminum Parts
#
1107 - Light-Weight Front Bulkhead (1)
#
1111 - Front Tower Mount w/ sway bar mount (1)
#
1115 - Center Motor Mount (1)
#
1116 - Center Bulkhead (1)
#
1117 - Center Bulkhead Cap (1)
#
1124 - Steering Bell Crank - 10 deg *left only* (1)
#
1128 - Battery Post w/ hex (4)
#
AE-31098 - FT-TC4 Antenna Mount (1)
Chassis Components
#
1101 - Worlds Chassis (1)
#
1102 - Worlds Top Deck - 2 piece (1)
#
1106 - Steering Rack - 10 deg (1)
#
1130 - Battery Strap (2)
#
1129 - Battery Tray (2)
#
1142 - BJ4 Heavy-Duty Front Arm (2)
Body, Wing and Accessories
#
1100 - BJ4 Worlds Body (1)
#
1100 - HD66" Wide High Downforce Wing (1)
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2004 JConcepts Decal Sheet (1)
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Window Masks (1)
#
BJ4 Worlds Instruction Manual(1)