Product Description
Cummins 3923178 — Genuine Compressor Outlet Elbow (Air Transfer Pipe) for 5.9L
MPN: 3923178 | Also Known As: compressor outlet elbow, turbocharger elbow, air transfer pipe | Associated Hardware: Clamp 3923060 / 3069053, O-ring 3883284
Genuine Cummins elbow that connects the turbocharger’s compressor outlet to the intercooler tube on HX35/HY35/HX40-equipped 5.9L trucks. Direct-fit for 1994–2002 Ram 5.9L Cummins (12V & 24V). One end is V-band to the compressor cover; the other end accepts a 3.0" intercooler hose. Elbow only; clamp and O-ring sold separately.
Features & Benefits
- OE geometry for proper charge-air alignment and sealing.
- Direct-fit replacement on HX35/HY35/HX40 applications (select S300 variants with matching V-band).
- V-band connection for quick service and reliable retention.
- 3.0" hose interface to match factory intercooler plumbing.
- Built to Cummins standards for durability and fit.
Verified Fitment (Automotive)
| Year Range | Engine | Turbo/Notes |
|---|---|---|
| 1994–1998 | 5.9L 12V (6BT) | HX35/HY35/HX40 compressor outlet elbow |
| 1998.5–2002 | 5.9L 24V ISB (VP44) | HX35/HY35/HX40 compressor outlet elbow |
Industrial/Off-Highway: Common on BS3 B-Series 5.9L applications (4BT/6BT/ISB) — verify by ESN before ordering.
Compatibility Notes:
- Designed as the factory elbow on 1994–2002 Ram 5.9L with HX35/HY35/HX40. Some S300 units use it when the compressor cover is machined for the OE V-band.
- Hardware sold separately: V-band clamp 3923060/3069053 and outlet O-ring 3883284 are required for proper sealing.
Specifications
- Type: Turbo compressor outlet elbow (air transfer pipe)
- OE Part Number: 3923178
- Turbo Compatibility: HX35 / HY35 / HX40 (select S300 variants with OE-style V-band)
- Outlet Size: 3.0" hose interface
- Quantity Required: 1 per vehicle (sold individually)
Often Paired With
- Clamp: 3923060 / 3069053 (V-band, compressor outlet)
- O-ring: 3883284 (compressor outlet flange)
- 3.0" intercooler hose & clamps (as needed)
What’s In The Box
- (1) Genuine Cummins Compressor Outlet Elbow (3923178)
- Clamp and O-ring sold separately (see “Often Paired With”).
Installation Tips
- Inspect the compressor cover groove and replace the 3883284 O-ring whenever the elbow is removed.
- Use the correct 3923060/3069053 V-band clamp and ensure the elbow is fully seated before tightening.
- Verify intercooler tube alignment and hose condition; replace aged 3.0" couplers.
FAQ
WILL THIS FIT MY 1994–2002 5.9L CUMMINS RAM?
Yes—this is the factory-style compressor outlet elbow for 1994–2002 Ram 2500/3500 with HX35/HY35/HX40 turbos. Confirm by VIN/ESN if unsure.
WHAT HARDWARE DO I NEED?
You’ll need the compressor outlet V-band clamp (3923060/3069053) and the outlet O-ring (3883284) for proper sealing.
WILL THIS WORK WITH AN S300 TURBO?
Yes on many S300 variants if the compressor cover is machined for the OE V-band and uses the 3.0" outlet; otherwise use the elbow provided with your turbo kit.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins part 3923178 (Cummins calls it an “air transfer pipe”).
WHAT SIZE INTERCOOLER HOSE DOES IT USE?
3.0" inside diameter hose on the tube side.
