S550 / S650 Mustang Big Bertha Diff Upgrade Kit, Poly Lockout Kit

Avoid headaches and replace those pesky failure prone Stock OE or aftermarket bushings and M14 sized differential mounting bolts with this KellTrac Big Bertha Diff Lockout Kit. This kit includes everything you need to upgrade your S550's Diff to the largest and strongest lockout kit on the market! This kit was tested for over 2 years, with multiple examples in the 1.1 sixty foot zone, multiple races won and records set, and ZERO failures to date.

Hardware Kit Includes: Zinc Coated High Strength Alloy Steel Bolts, Grade 8 nuts and HSS Drill Bit.

• 15% larger than next strongest offering
• 25% more clamp than next strongest offering
• Industry's largest and strongest bolts, ASTM A574, 170,000psi Tensile Strength
• High Quality, High Strength Zinc Coated Grade 8 Flanged Nuts
• High Quality Name Brand HSS Drill Bit
  

Diff Bushing Kit Includes: 4 Poly Bushings with Billet Inserts and 4 Massive Stainless Steel Washers

• 95 durometer Poly for no compromises!
  
• No voids that increase deflection!
  
• Kit is modified for direct fit with our Big Bertha Hardware
  

NOTES:

-Due to this system being a true through bolt set-up and the bolts being larger than M14 - drilling of all bushing/mount locations is required

-Due to the massive size difference of this kit compared to others, minor modification (grinding) needs to be done on the fore side of the rear diff cover mounts

-We recommend torquing to 185ftlbs with a "dab" of name branded Blue Loc-Tite.