The ‘Zip-Rack’ is a fully assembled shaft and gear set that has been treated with our famous back-cut service. We start with a full set of new Andrews gears and shafts. The engagement dogs are carefully machined to the proper rake and depth by Zipper’s for positive engagement, eliminating missed shifts at high RPM. The gears and shafts are assembled with new thrust washers and bearings, then installed on a billet door.

Big Twin models are assembled using our billet transmission door specially machined to include super-strong double-row ball bearings which minimize shaft flex while providing the best support and strength possible. Black powder coat finish.

Sportster® Note: 817-180S is designed for street and part-time racing use; for full-race cut, order # 817-180R (additional charge).

Weight1 lbs

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Customers' review

Rated 5.00 out of 5 stars
1 review
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1 review for Zipper’s Zip-Rack 5 Speed Transmissions

  1. 5 out of 5

    This gear set rocks! This gear set rocks! Harleys typically shift with a clunk. Not this gear set. I sent a new set of close ratio gears to Zippers for their ‘Back Cut Service’. The cost was minimal and with their great reputation I knew it would be done right. I have used Andrews close ratio gears for years in my bikes so I had an idea of what to expect, or so I thought. To say this transmission shifts smooth and reliably would be an understatement. 130 horsepower, full throttle shifts happened with the precision of a fine Swiss watch. Even putzing around town with my wife on the back, the transmission shifts much smoother than most of the sport bikes I have ridden. This has got to be one of the best bang-for-the-buck upgrades I have encountered. From now on, every bike I have will get either a full Zip Rack or have its gears back cut.

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