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JEEP Model, Year, and Engine We ONLY SUPPORT those vehicles and engines listed below. Grand Cherokee: No Products

S2572-PHRX, Super Brackets, Pair, 1987-1990 XJ, MJ 4.0L

Your Price: $399.95
Part Number: S2572-PHRX
Includes: Everything shown plus 1 sticker
Made in USA: Using USA steel, bushings, hardware, etc.
Warranty: Lifetime
Brown Dog Pair Super Engine Brackets for 1987-1990 4.0L I-6 Jeep Cherokee XJ, Comanche MJ with Renix Fuel System.

Super Engine Brackets virtually eliminate offroad torsional forces snapping bolts or ripping the bracket from the case. Featuring more attach points than the original brackets, the design spreads engine block attachment stress loads. Ideal for engines with one to three sheared bolts or snapped bosses. Left bracket features seven bolts, four more than the original. Right bracket features eight bolts, five more than the original. Double-welded, all-steel construction for extra strength. No engine block modification necessary. Bolts directly to existing 4.0L or 4.2L Jeep engine block bolt pattern. Designed for use in 1987-1990 Cherokee XJ and Comanche MJ with the original Renix fuel system.

Designed to accommodate both original-style manifold and aftermarket headers. According to header manufacturer's warranty staff, one of the leading causes of cracked headers is worn motor mounts and cracked/worn brackets. (Of course, worn or missing exhaust hangars/brackets also can cause cracks.) This Brown Dog bracket design works with your original manifold or Banks, Borla, Pace Setter, Edelbrock, and many other common headers. The bracket and mounts, when used together, offer a little more room in the exhaust area to assure no conflict. So why risk cracking a header? Secure your engine and header in place with Brown Dog motor mounts and brackets.

Change mounts and brackets all at the same time and never have to do it again. When converting to these brackets, we strongly recommend upgrading to Brown Dog high-performance motor mounts or motor mount lifts. While these brackets can be used with original-style motor mounts, the original mounts, designed for street driving, simply won't stand up to the torsional forces experienced offroad. Select one of the following kits and get both mounts and brackets.

  • Super Kit, S2572-0HRX, includes Super Brackets & High-Performance Classic Polyurethane Motor Mounts.

  • Super Kit, SU2572-0HRX, includes Super Brackets & High-Performance Ultra-Flex Rubber Motor Mounts.  

Installation Hardware Included.
The Brown Dog ships all new Grade 8 hardware (or metric equivalent) required to bolt both brackets to all attach points in the existing engine block. Grade 8 through-bolts, lock nuts and washers are also included for securing brackets to motor mounts or motor mount lifts.

Application Notes:
Utilizes existing bolt pattern found on 4.0L (6 cylinder) Jeep engines found in the following vehicles.
  • Cherokee XJ, 4.0L I-6, 1987, 1988, 1989, 1990 (includes PN RX2572, Renix Knock Sensor Adapter)

  • Comanche MJ, 4.0L I-6, 1987, 1988, 1989, 1990 (includes PN RX2572, Renix Knock Sensor Adapter)

Installation Notes

  • In preparation for installation, we suggest using brake fluid cleaner or PB Blaster to clean out the additional engine block thread bosses.  

  • A copy of the installation instructions showing which holes take which bolts will be included with your bracket. We can also email it ahead of time when requested.