| Diagram | Fig. 16 — SWINGING FORK, SUSPENSION UNITS AND CHAINGUARD · ref 12 |
| Subsystem | primary |
| Listed in parts books | 1969 |
Spring, 145 lbs. chrome heavy duty (540034)
A 145 lb. chrome heavy duty rear suspension spring, cataloged as 99-1047 (also 540034).
This is a 145 lb. chrome heavy duty spring, listed under part number 99-1047 with the cross reference 540034 in our records. It shows up in the parts book under Swinging Fork, Suspension Units and Chainguard, which puts it with the rear suspension hardware rather than anything in the primary drive despite how it's filed on our end.
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A spring rated this way is used inside a rear suspension unit to control how the rear end reacts to load and road shock. The 145 lb. rating and heavy duty designation tell you this is a stiffer option, meant for a firmer ride than the standard-rate spring would give.
We only have this single catalog entry to go on, and it doesn't tie the part to a specific model or year beyond 1969. If you're matching this up to your suspension units, give us a call and we'll confirm it lines up with what you've got before you order.
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