› Pro-line Pow­er­stroke HD Shock Shafts for Traxxas X-maxx

Su­per-sized shafts to make your X-maxx an even might­ier ma­chine

RC Car Action - - CONTENTS -

Pro-line’s been on top of the X-maxx since Traxxas first dropped the su­per-sized mon­ster on the RC scene, and the PL crew hasn’t lim­ited them­selves to bod­ies, wheels, and tires. I tested the trick Ul­tra Reser­voir Caps for the X-maxx’s fat alu­minum shocks back in the Oc­to­ber 2017 is­sue, and now Pro-line has an equally di­aled bot­tom end for the dampers. The Pow­er­stroke HD shafts are a com­plete shaft/pis­ton/seal car­tridge as­sem­bly that fea­tures sig­nif­i­cantly thicker shafts, new spring perches (with shaft guards—nice), and new rod ends to ac­com­mo­date the thicker shafts. Here’s how it all goes to­gether and per­forms.


Pro-line as­sem­bles the shaft units for you and says, “Just in­stall and go.” You can do that, but I took apart the seal car­tridges and coated the O-rings and shaft guides with Protek Pre­mier

Blue seal grease. I had to take ev­ery­thing apart for pho­tos any­way, and seal grease is a par­tic­u­larly good idea on a heavy­weight ma­chine that’s re­ally go­ing to work the shocks. Pro-line makes it easy to get to the seals: Just un­screw the lower alu­minum cap, which has flats if you need to put a wrench on it (you’ll need a 20mm). The thick O-ring seals are widely spaced, and a pair of shaft guides help re­duce shaft de­flec­tion. I left the in­stalled molded­del­rin “1.6” pis­tons in place since they match the stock pis­tons. Pro-line also in­cludes

“1.4” pis­tons if you want firmer damp­ing. Be­fore in­stalling the shaft as­sem­blies in the bod­ies, I slid the car­tridges up and down the shafts to see how much re­sis­tance the seals of­fered, which was very light, so op­er­a­tion will be ex­tra slick. The only thing I missed from the stock shock setup was the shaft-wiper boot that fits over the bot­tom of the seal car­tridge, but that’s not a deal breaker. I’m happy to trade the shaft wiper for the stouter shafts.

Since the 6.5mm Pro-line shafts are 25 per­cent thicker than the stock 5.2mm shafts, they also dis­place quite a bit more oil than the stock shafts when the shock is com­pressed. And so I in­stalled Pro-line’s Ul­tra Reser­voir Caps to pro­vide ex­tra vol­ume com­pen­sa­tion. The Pro-line shafts can be used with the stock blad­der-equipped caps, but I wanted to test an all-pro-line build. That in­cludes the springs, with a set of red “firm” up­per and lower coils from the 6299-00 set re­plac­ing the sin­gle-rate Traxxas springs. The Pow­er­stroke shafts aren’t meant to change han­dling feel, they’re just meant to be more durable, so there’s no “they felt bet­ter than stock” com­po­nent of this test. And while I can say I didn’t break the Pro-line shafts, I haven’t bro­ken any stock shafts, ei­ther—but there’s no way the Pro-line shafts aren’t stronger, given their in­creased thick­ness straight through the threads. I was pleased to see the ti­ta­nium car­bon ni­tride (TICN) shaft coat­ing still looks new af­ter putting a bunch of time on the shafts, and I haven’t seen any weep­ing at the shaft exit or where the car­tridge threads into the body. What did make a no­tice­able dif­fer­ence feel-wise was the dual-rate springs, which are very sup­ple over smaller bumps as the softer, up­per springs do their thing. You can mix and match the soft, medium, and firm up­per (pri­mary) springs with the soft, medium, and firm lower (sec­ondary) springs to re­ally dial in your setup. As for me, I just went firm be­cause I’m all about big hits when I’m in X-maxx mode.


More nice sus­pen­sion stuff from Pro-line; they’ve re­ally got the Pow­er­stroke lineup di­aled in. Fit and fin­ish is ex­cel­lent, and all you have to do is look at them to know they’re go­ing to out­last the stock parts. As ex­pected for high-qual stuff in a large scale, the HD shafts aren’t cheap. But spend­ing the ex­tra dough sure beats re­plac­ing bro­ken stock shafts, a job that is low on any­one’s list of fa­vorite RC ac­tiv­i­ties, no mat­ter much you love wrench­ing. If you find your­self with a bro­ken X-maxx shock shaft, skip­ping the stock re­place­ment in fa­vor of up­grad­ing to Pow­er­strokes is a smart way to go.—peter Vieira


Pro-line pro­lin­erac­ing.com

The Pow­er­stroke shafts ar­rive as­sem­bled, com­plete with a tall shaft guard.

62 Here’s the Pow­er­stroke shaft next to the stock Traxxas X-maxx shaft.

I as­sem­bled the shocks with Pro-line’s Dual-rate Springs (6299-00) and Ul­tra Reser­voir Caps (6293-00, as tested in the Oc­to­ber 2017 is­sue).

Pro-line–equipped ver­sus stock. Looks pretty trick, right?

The stock X-maxx seal car­tridge con­tains one X-ring seal, while the Pro-line unit con­tains two fat O-rings and a pair of Del­rin shaft guides (I left one out in this pic—oops). An alu­minum cap holds it all to­gether.

The 6.5mm Pro-line shafts are sig­nif­i­cantly beefier than the stock 5.2mm shafts, and coated with TICN to re­duce fric­tion. Note the fat threads, too—there’s no step-down to the threaded por­tion of the shaft.

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