Pro Series 4-Link Kit

Quarter-Max's Pro Series 4-Link Kit was designed to hold up to high horsepower and has been race proven on RJ Race Cars for years.

This kit features our high quality 1-1/4 in.x.095" 4130 Pro Series 4-link bars. This is a stronger upgrade that comes standard in our kits, vs most kits on the market that only have 1 in. direct tap tubes.

The Quarter-Max Pro Series line of chassis and housing brackets feature a hole spacing of .800 in., instead of the normal 1 in. spacing to allow for a finer range of adjustment. Our brackets are manufactured in-house to high quality specifications with precise hole locations and smooth profiles.

Chassis Brackets:
Chassis brackets are available in 1/4 in. thick mild steel or 4130. We offer 4 different styles of weld-on chassis brackets. They are available in different materials and heights/configurations to fit any chassis crossmember setup:
• 4130 - 13 in. Notch
• 4130 - Round Tube Back-Half
• 4130 - Blank No Notches (Universal)
• Mild Steel - Blank No Notches (Universal)

The 13 in. notch chassis brackets feature notches for 1-5/8 in. crossmembers. The center of the top crossmember to the center of the bottom crossmember is 13 in.

Our 13 in. notch and round tube back-half chassis bracket styles feature qty (8) 1/2 in. top holes and qty (5) 1/2 in. bottom holes for a wide range of 4-link tuning adjustability

Our blank no notches (universal) chassis bracket styles are universal/trim to fit for any application. They feature qty (8) 1/2 in. top holes and qty (6) 1/2 in. bottom holes for a wide range of 4-link tuning adjustability.

Housing Brackets:
Housing brackets are available in 1/4 in. thick mild steel* or 4130 with a 3 in., 3-1/4 in., or 3-1/2 in. axle tube hole size.
*Mild steel is only available in a 3 in. axle tube hole size.

This kit also features NAS bolts with MilSpec nuts. Close tolerance holes for the 1/2 in. NAS bolts provide a tight fitment and considerably less bolt movement than competitors systems.

Kit includes:
• (4) Pro Series chassis 4-link brackets
• (4) Pro Series housing 4-link brackets
• (4) 1-1/4 in.x.095 in. 4130 Pro Series 4-link bars
• (4) 3/4 in.-16 LH tube adapters
• (4) 3/4 in.-16 RH tube adapters
• (1) 1/2 in. bore x 3/4 in.-16 thread 4130 rod end kit
• (2) Pro Series threaded shock mounts
• 1/2 in. NAS 4-link bolt hardware

1/8 in. thick 4130 upper and lower doubler plates for the chassis and housing brackets are available to increase the thickness around the holes to 3/8 in. for added strength and longevity. When the doubler plate option is selected, you will be upgraded to longer NAS 4-link bolts. Note: double plates require TIG welding.

During installation while mocking up and welding, we recommend the use of grade 8 bolts with our 4-link jigs to hold the brackets together in the correct position. After all the welding is complete, we recommend reaming the holes using our 7 piece chucking reamer kit #RJ-219850. Do not use a drill bit!