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A good deal of common sense must be exercised in the assembly of this unit, high quality welds are essential, we recommend Heli-ARC (TIG) Welding. If you are in doubt about your welding ability, we strongly suggest that you tack weld components in place and take them to a competent or certified welder for final welding.
1. Frame should be boxed in the area of crossmember attachment; areas adjacent to welds must be sandblasted or ground clean.
2. Set the frame on sawhorses or a suitable working area and level the frame from side to side and front to rear, using a good carpenters level.
A) Front to rear frame “rake” can be set at this time.
3. Square the frame by cross measuring.
A) Frame may be a parallelogram (one rail behind the other)
4. Removing existing rear crossmember:
A) Tack Weld in temporary straps across the top and bottom of frame rails about 12 inches in front of crossmember.
B) Insure that frame rails are not sucked in at the bottom; some rails are twisted in at the bottom, possibly from overuse of the running boards in the past.
C) Measure width of frame: outside measurement (OD) will be approximately 44 3/16″ at rear axle centerline.
D) Rails may be “bulged” out at rear axle CL; due to axle bottoming on frame, or possibly frame was rear? ended.
E) Repair or straighten as required.
5. Trim required amount off WEEDEATER ADJUSTABLE CROSSMEMBER.
A) Amount trimmed off depends on whether crossmember is butt welded to boxing plates, or placed on inside of edge of frame rails and welded.
6. Bolt crossmember assembly to top of Jag Pumpkin using the tapered seat OEM Jag Capscrews. (part # C17024 if you don’t have them)
A) Narrower end of center mount plate to the rear of car.
B) Assemble lower control arms to Jag Pumpkin using fulcrum mounts, shafts, washers and spacers. (See our Catalog or Jag Manual)
C) Bolt Pinion Support Bracket to front of Jag fulcrum shafts at this time.
D) Centerline of crossmember and centerline of 1/2 Shafts should coincide.
E) Shock bosses on crossmember and Lower Control Arms (LCA) should be parallel.
7. Position crossmember between frame rails. (see NOTES back page)
A) Vertical positioning of crossmember depends on desired ride height.
B) For wheel base positioning: see NOTES
C) Jag sedan pinion centerline will be parallel with the fulcrum shaft centerline.
D) Jag XKE pinion centerline will point slightly upward at an angle of 5?60. (XKE’s can be converted to flater sedan angle: see NOTES)
8. TACK weld crossmember in place: DO NOT FINAL WELD CM IN AT THIS TIME
9. Attach pinion support bars to front pinion support tybar.
A) Clevis ends attach to pinion support tybar.
B) Capture bushing ends with teardrop shape gussets, 9/16″ bolts, washers and nuts supplied.
C) Adjust length of support bars to position capture gussets to lower edge of frame rails.
D) Tack weld teardrop gussets in place.
10. Check that face of shock boss on crossmember and LCA are essentially parallel.

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