Open up the main drive of a URAL rear or middle axle and at the centre of the differential you will find the case 375-2403022 (Russian: корпус дифференциала) — a two-piece housing that holds the entire spider-gear and side-gear set. Crack it, score its bearing seats, or strip its bolt holes, and the whole differential is scrap. This guide covers what it is, how it is supplied, and the fitment picture from 27 assembly diagrams.
What the differential case does
The differential case is the structural heart of the axle's main drive. It bolts to the crown wheel, spins with it, and houses the spider (satellite) gears and side gears that split torque between the left and right axle shafts. Every bit of drive torque to the wheels passes through this housing.
The 375-2403022 is supplied as a set of two halves (cups), each with 8 mounting holes. The two halves clamp the gear set together and carry the differential bearings — which is why the case is machined as a matched pair and should be kept as one.
Specifications
| Property | Value |
|---|---|
| Part number | 375-2403022 (also written 3752403022) |
| Name | Differential case / корпус дифференциала |
| Group | Rear axle — differential assembly |
| Supply form | Set of two halves (cups) |
| Mounting holes | 8 per cup |
| Manufacturer | AZ KAMAZ |
| Assembly diagrams | Appears on 27 drawings |
A cross-brand part
A detail worth knowing: although this case is catalogued under the URAL series and fits Ural trucks, it is manufactured by AZ KAMAZ — the KAMAZ axle plant. The Ural-375/4320 axle family shares differential internals with the KAMAZ axle line, which is why the same case appears across both brands' drawings. For buyers this is good news: the part is produced in volume and widely stocked.
Which trucks does it fit?
From the 27 assembly diagrams, the case appears across the URAL 6x6 family, including:
- Ural-375 — differential and axle shaft drawing, position 8, quantity 1
- Ural-4320 — middle and rear axle differential drawings, position 16, quantity 2 (one per axle), plus front-axle differential drawings at position 12
- Ural-4320-61 and related variants (1978–72 and 2013 catalogues)
The quantity pattern tells the story: a 6x6 Ural has a differential in every axle, and the same case serves them — so a full truck-set overhaul counts multiple cases.
Before you order
- Match the catalogue number 375-2403022 against your parts book.
- Remember it is a matched two-half set — never mix halves from different sets.
- A case replacement usually follows bearing-seat or bolt-hole damage; inspect the crown wheel, spider gears and bearings at the same time, since they share the failure.
- Count axles: middle and rear (×2) plus front where applicable.
Where to look it up
Full specifications and all 27 assembly diagrams with position numbers are on the part page:
375-2403022 Differential case — kamaz-parts.com
The catalogue covers 87,000+ KAMAZ, URAL, MAZ, MTZ and TATRA part numbers organized by the original OEM drawing structure (brand → model → assembly group → position table), so you can verify any number against the actual assembly drawing before ordering. Wholesale inquiries go straight from the part page — mixed pallets welcome, export paperwork included.
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