DIVERSIFIED MACHINE INC. 2020 PRODUCT GUIDE
XR-1
XR1-4.86
Bulldog XR-1
4.86 Complete Rear
82lbs.
XR1-4.12
Bulldog XR-1
4.12 Complete Rear
82lbs.
XR-1 Dimensions:
The Bulldog XR-1 is the original Bulldog Quick Change. Since being introduced in 2004, the Bulldog XR-1
has raised the bar in performance, reliability and durability. The XR-1 is chosen by some of the sport’s top
professionals. DMI's machine process ensures zero center section runout. New for 2020 - all axles feature 1"
increased left side spline length to accomodate deeper offset wheels.
Standard Features Include:
• O-Ringed Aluminum Gear Cover
• Heat Treated Lower Shaft
• Breather Assembly
• Timken® Pinion Bearings
• Non twist one bolt shifter mount
• 3 quarts Bulldog Blood Oil
• Torque Tube Studs
• Center Section warranty
• Ease-Align Shifter Arm
Weight Savings of Some Popular Options
XR-1 4.86 Std Rear = 82 lbs.
Description Savings
4.12 Ring & Pinion .75 lbs.
EDM Ring Gear .80 lbs.
Titanium Lower Shaft (Internal 10-10) 1.18 lbs.
Titanium Hardware .89 lbs.
2" I.D. Axle 2.27 lbs.
Important Specs
Side Bell Nuts- 30 ft./lbs.
Threaded Ring Gear- 60 ft./lbs. w/ Red threadlocker
Pinion Retainer Bolts- 25 ft./lbs.
Pinion Backlash- .004-.008
Rotational Pinion Preload (No axle) - 25 in/lbs. @ 70° F
Rotational Pinion Preload (Complete Assembly) - 48 in/lbs. @ 70° F
Starting Recommendations for Shims Left- .080" Right - .160"
Important Driveline Lengths when using XR-1 with a 40" Engine Setback
Internal 10-10 Driveshaft – 29” w/ U-Joint Spring
DMI Style Swivel Coupler Driveshaft – 26.5” w/ U-Joint Spring
Winters Style Swivel Coupler Driveshaft – 27.5” w/o a U-Joint Spring
Torque Tube – 27”
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