This Winters Quick Change Rear End Assembly has been specifically developed for Modifieds.  

The package includes the following items and options:

Magnesium Rear End Assembly 
8111 -    4.12 Ring & Pinion
8104 -      Aluminum Pinion Posi-Lock Assembly
8130 -     Ultra Lightweight 31 Spline Aluminum Spool
8133-10-6 -     Sprint Center, 6 Bolt
8143 -     Pinion Nose Roller Bearing
8186P -     6 Rib Bell with Inspection Ring
8199 -     Seal Plate, Low Drag Viton
8208 -     Thermal Dispersant Coating
8218-BRG -     Low Drag REM Bearings
8218-RP -     Low Drag REM Ring & Pinion
8298 -     Low Drag Viton Seals
Weight = 97 lbs

This item ships via truck freight.