Description
The Gunite 3922X is a 16.5″ x 7″ outboard-mount balanced brake drum, 10-bolt pattern, replacing legacy Gunite 3600A / 3600AX, Meritor 85123788002 / 85123207002, and ConMet 10001776 across heavy-duty drive and trailer axles. Cast-iron construction (Gunite Value Plus, USA-made), pilot 8.78″ with 10.56″ overall depth, 105 lb. Rated up to 24,000 lb GAWR.
Signs You Need a New Brake Drum
- Drum machined past the maximum service / discard diameter stamped on the OD
- Heat checks, stress cracks, or hard spots on the friction surface
- Brake judder, pulsation, or steering wander under braking
- Out-of-round or visibly scored / bell-mouthed drum bore
- Excessive lining wear with normal use, or new shoes glazing on contact
Specifications
| Manufacturer | Gunite (Accuride) |
|---|---|
| Part Number | 3922X |
| Part Type | Outboard-Mount Balanced Brake Drum |
| Brake Size | 16.5″ x 7″ |
| Bolt Pattern | 10 holes, 1.10″ hole size |
| Pilot Diameter | 8.78″ |
| Overall Depth | 10.56″ |
| Weight | 105 lb |
| GAWR Capacity | Up to 24,000 lb |
| Construction | Cast iron (Value Plus, USA-made) |
| Mounting | Outboard, balanced |
Cross References
This brake drum replaces or is equivalent to the following part numbers:
- Gunite: 3922X, 3600A, 3600AX, 3570AX, 7006X, ZBR3600AX
- Meritor: 85123788002, 85123207002, 123537
- ConMet: 10001776, 10009830, 10030774, 10080275, 107150
- Webb: 56864B, 66864B, 66884B
- Centrifuse: 89996B
- Dayton: 123207
- Durabrake: 16792
- Erie Wheels: 2764-5
- Fleetrite: FLT4400B, 1648360C1, 1648360C2, 1652871C1, 2605072C1
- Freightliner: ABPN42A1657VB, ABPN42A1657B
- Fruehauf: MDA123207
- Fuller Metric Parts: 126949, 974482
- HDValue: HDV1601B
- KIC: 60001018, 60000-018
- NAPA: 821-9326
- Oshkosh: 8JA231, 5MB236
- OTR: OTR1601B, OTR2601B
- Paccar: K-121-87, K121-89, 03-05449
- Power Products: PP1601B
- Reyco Granning: 60001-018, 53033-018
- TRP: DB1657B
- Volvo: 1117787, 8086491
- Automann: 151.6726BA
- Armada: DU60793
Applications
This 16.5″ x 7″ balanced drum fits 10-hole outboard-mount brake assemblies on:
- Class 8 drive axles — Meritor RT and FF series, Dana / Spicer DSP / DST, Eaton drive axles
- Heavy-duty trailer axles using 16.5 x 7 S-cam brakes (Reyco, Hendrickson, Meritor)
- Vocational and severe-duty chassis (Freightliner, Kenworth, Mack, Peterbilt, Volvo, Western Star, International, Oshkosh)
Verify brake size (16.5 x 7), bolt pattern (10-hole, 1.10″ hole), pilot diameter (8.78″), and outboard vs. inboard mount before ordering — same brake size with a different mounting style is not interchangeable.
