Harddrive Rear Axle Adjuster Kit - FXR 1984-1991 FX 85 Fxwg 1985-1986 XL 1986-1… — Harley-Davidson (1984-1996)

Harddrive rear axle adjuster kit for 1984-1991 FXR Super Glide and 1985-1996 Sportster models. Prevents swing arm tube collapse from over-tightening and ensures proper rear axle alignment with included heavy-duty washers.

Features

• Rear axle block adjuster design
• Prevents swing arm tube collapse
• Heavy-duty washers included
• Direct OEM replacement

Specifications

• Brand: Harddrive
• Manufacturer Part #: 339100
• UPC: 191361167355
• Weight: 1.1405 lbs
• Country of Origin: China (Taiwan)

Fitment

Fits 1984-1991 Harley-Davidson FXR Super Glide and 1985-1996 Harley-Davidson Sportster (XL) models.

Frequently Asked Questions

What's included in this kit?

The rear axle adjuster block and heavy-duty washers needed to properly tension the rear axle without over-tightening.

Will this prevent my swing arm from collapsing?

Yes — when installed correctly, this kit prevents the swing arm tube from collapsing due to over-tightening the rear axle nut.

Does this fit my 1992+ Sportster?

This part is for 1985-1996 Sportster models. Check your year against the fitment list before ordering.

Is installation difficult?

This is a straightforward bolt-on adjuster block. Basic hand tools and mechanical knowledge are needed; refer to your service manual for proper axle torque specs.