This is the MIP TLR 22 4.0 Bi-Metal 13.5 Super Diff Drive Kit.

This all in one unique MIP Bi-Metal kit offers up a staggering 35 plus percent drop in rotational mass, all the while still keeping the same binding characteristics that you are used to with a pin drive system! Rated for both super stock and stock classes alike this upgrade will directly increase both bottom end acceleration and decrease motor fatigue. All main components in the kit are made with the highest grade materials ranging from hard anodized 7075-T6 aluminum, heat treated steel, carbide diff components, ground diff rings, and the list goes on. Of course this entire kit is made 100% in the USA.

Features:
35% + Reduction in Rotational Mass
Increased Acceleration
Pin Drive Binding Characteristics
Less Motor Fatigue
7075-T6 Hard Anodized Aluminum
Bi-Metal Outdrives and Bones
Heat Treated Outdrives
Carbide Diff Balls
Ground Diff Rings
Aluminum T-Nut
Captured Thrust Assembly
100% Made in the USA!

Includes:
(2) MIP Confetti Sticker
(1) MIP Lube &Thread Gel Cup
(1) MIP Diff Lube & Grease Cup
(1) MIP Thread Gel Safety Sheet
(1) MIP Inst. Sheet
(7) 1/16” Chrome Steel Ball Bearing
(14) 3/32” Gr.25 Tungsten Carbide Diff Ball
(2) MIP Diff Ring
(1) #2 Hardened Washer
(1) ¼ x 9/32” Diff Spring
(1) 2-56 x .925 Shoulder Diff Screw
(1) MIP Thrust Retainer
(2) 5x8x2.5mm Bearing
(1) MIP T-Nut Housing .250 Bore
(1) MIP T-Nut Insert .250 Bore
(2) 4-40x3/32” Cup Point SHSS
(2) 1/16” x .430 Solid Pin
(2) 1/72” x .250 Cap Screw SHCS
(2) MIP 3/16” CVD™ Coupling
(2) MIP Bi-Metal R-CVD™ Yoke, Front, AE B64
(1) MIP Bi-Metal “Pin” Male Outdrive Cup
(1) MIP Bi-Metal “Pin” Female Outdrive Cup
(2) MIP Bi-Metal R-CVD™ Bone 67mm
(2) MIP Bi-Metal Outdrive Hub