Diesel World - - Tech -

mag­netic plug will also trap those small metal par­ti­cles and keep them from be­ing passed through the gearset. They’ve also en­gi­neered an easy-see sight glass on the side so you can mon­i­tor fluid level and con­di­tion with­out hav­ing to drain the diff or re­move the cover.

One neg­a­tive as­pect to all the ex­tra torque we’ve added since the truck was stock (with plenty more to come in the next cou­ple in­stall­ments) is the strain it cre­ates on the driv­e­train. Ex­tra torque puts more load on the driv­e­line and rear axle, and un­der heavy ac­cel­er­a­tion it will cause the rear axle to “wrap,” or ro­tate, un­der the load, throw­ing off the U-joints and pin­ion an­gles and po­ten­tially lead­ing to pre­ma­ture fail­ure. It also can change the rear sus­pen­sion geom­e­try enough that the tires will lose trac­tion at the ground, cre­at­ing a shud­der and wheel-hop sit­u­a­tion when tow­ing, rac­ing or sled pulling.

To over­come these is­sues, the Duramax spe­cial­ists at HSP Diesel devel­oped a true bolt-in, bud­get-friendly trac­tion bar kit that will re­solve the above noted is­sues, while look­ing great un­der­neath the truck thanks to many pow­der­coat­ing op­tions. Trac­tions bars are ex­actly what the name im­plies: an ad­di­tional bar added un­der the ve­hi­cle to help lo­cate the axle and pre­vent it from wrap­ping un­der load, plant­ing the tires and elim­i­nat­ing wheel hop and driv­e­train shud­der.

 Next comes the tough­est part of the job: drilling the four mount­ing bracket holes in the fac­tory frame rails. By mount­ing the trac­tion bar to the lower bracket al­ready on the truck, the frame bracket can be loosely aligned to the Heim joint and held in its cor­rect lo­ca­tion on the frame so the holes can be marked.

 You’ll need to make sure that the axle U-bolts and the lower axle bracket line up square with the axle. Tight­en­ing each bolt a lit­tle at a time will help keep ev­ery­thing in line. That new Kingsport Grey pow­der­coat is go­ing to look great un­der­neath this truck.

 To en­sure years of trou­ble-free ser­vice, the trac­tion bar kit in­cludes a fully ser­vice­able, top-of-the­line Heim joint to con­nect the bars at the frame. These Heims will al­low you to fine-tune over­all bar length and can be eas­ily re­built should they ever need to be.

 With the mount­ing holes drilled and the up­per brack­ets in­stalled at the frame, the trac­tion bars can be as­sem­bled and bolted into place us­ing the sup­plied Grade 8 hard­ware. Be sure to grease the up­per Heim joint so it can move freely as needed.

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