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Model, Year, and Engine

SU2572-0HRX, Super Kit, Ultra-Flex Rubber, 1987-1990 XJ, MJ 4.0L

SU2572-0HX, Header Super Kit, Ultra-Flex Rubber
SU2572-0HX, Header Super Kit, Ultra-Flex RubberSuper Kit
Price: $349.95
Part Number: SU2572-0HRX
Includes: Everything shown plus 1 sticker
Made in USA: Using USA steel, bushings, hardware, etc.
Warranty: Lifetime - Except bushings
Note: Mounts, brackets available separately
Super Kit: Includes Super Engine Brackets and Ultra-Flex Rubber Motor Mounts for 1987-1990 4.0L Jeep XJ and MJ with Renix Fuel System.

Change to the Brown Dog engine mount system and never have to do it again. 
  • Super Strong Engine Brackets for either original-style manifold or aftermarket header - 7 Bolts, Left; 8 Bolts, Right

  • High Performance Classic Polyurethane Motor Mounts - Stock Height

  • All Grade 8 or M10.9 Hardware, including through bolts.

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. 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 Cherokee XJ and Comanche MJ.

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.

High Performance Motor Mounts feature all-steel, double-welded construction. Stock-height, these are high-strength replacements for the originals. Designed to stand up to the toughest trails Arizona can dish out. (Sorry Utah, we can't stand the cold.) When compared to the originals and most others, these are a substantial upgrade. The original mounts, designed for street driving, simply won't stand up to the torsional stress experienced offroad. 

Interchangeable Ultra-Flex Rubber bushings. Featuring Ultra-Flex Rubber bushings, these Motor Mounts will dampen some drive line vibration. Want a sportier feel for your rig? Select Classic Polyurethane Motor Mounts in the S2572-0HRX kit instead. Not sure which is better for you? Compare here.

 

Ships with Grade 8 Hardware (or 10.9 metric equivalent) required to bolt engine brackets to existing engine block bolt pattern. Also includes new Grade 8 thru-bolts, lock nuts and washers for securing brackets to motor mounts. 

Application Notes:
  • 1987, 1988, 1989, 1990 4.0L Comanche MJ with Renix fuel system
  • 1987, 1988, 1989, 1990 4.0L Cherokee XJ with Renix fuel system
  • Some engine blocks in this period did not have the thread bosses later used for the coil pack. If your block does not have these holes, you will not be able to take advantage of two holes in the right bracket. They will simply be left empty.

Installation Notes

  • In preparation for installation, we suggest using PB Blaster or similar 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.