| Diagram | Fig. 5 — Gearbox: Shell, Gear Cluster, Mounting Bolts, Adjuster and Countershaft Sprockets · ref 1 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1972 |
Norton Gearbox Shell with Bushes and Studs
Gearbox shell assembly with bushes and studs, the main housing for the gear cluster and transmission internals.
This is the gearbox shell itself, the main casting that holds the gear cluster, bushes, and mounting studs for the transmission. Everything else in the box — the mainshaft, layshaft, selectors, and the countershaft sprocket — locates and rides in this housing, so if the shell is cracked, stripped, or worn oversize at the bushes, nothing downstream will hold tolerance no matter what you replace around it.
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The catalog lists it with its bushes and studs included, meaning it comes as an assembly rather than a bare casting, which is worth knowing when you're pricing a rebuild against buying pieces separately.
Our record for this one shows it appearing in gearbox figures covering the shell, gear cluster, mounting bolts, adjuster, and countershaft sprockets, spanning catalog years 1971 to 1972. It doesn't tie to a specific model beyond that, so give us a call and we'll confirm fitment before you order.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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