The OEM 1358203238 Countershaft is a genuine ZF-specification transmission countershaft designed for ZF 16S- series and 12S- series heavy-duty truck transmissions. This countershaft transfers power from the input shaft to the output shaft through gear sets, enabling smooth gear engagement and reliable torque delivery under heavy loads.

Manufactured from case-hardened nickel-chromium alloy steel, the 1358203238 countershaft is precision-ground to OEM tolerances (±0.015mm on gear seats and bearing journals). Each unit undergoes 100% dimensional inspection, magnetic particle testing (MPT), and hardness verification before shipment.

According to ZF Aftermarket technical documentation, the 1358203238 countershaft is used across multiple ZF transmission platforms including the 16S-109, 16S-151, 16S-130, 16S-2221, 16S-2520, and 12S-2210 series, covering engines from 380 HP to 660 HP in Class 8 trucks and heavy commercial vehicles.

Engine & Vehicle Applications

Specifications

• OEM Part Number: 1358203238
• Part Name: Countershaft (Lay Shaft)
• Brand: ZF OEM Specification
• Material: 20MnCr5 / 20CrMoH case-hardened nickel-chromium alloy steel
• Surface Hardness: HRC 58-62 (case depth 0.8-1.2mm)
• Core Hardness: HRC 30-38
• Overall Length: Approx. 680mm (varies by transmission model)
• Gear Seat Diameter Tolerance: ±0.015mm
• Bearing Journal Tolerance: ±0.010mm
• Runout (TIR): ≤ 0.03mm
• Surface Finish: Ra ≤ 0.4μm on gear seats
• Weight: Approx. 18-22 kg (depending on variant)
• Certification: ISO 9001:2015, IATF 16949
• Warranty: 12 months
• MOQ: Sample order supported (1 pc)
• Lead Time: 7-15 working days
• Packaging: Export-standard with anti-corrosion oil wrap and wooden crate

Cross Reference Numbers

Verify the exact OEM number and transmission model before ordering. Contact our technical team with your vehicle VIN or transmission serial number for cross-reference confirmation.

Manufacturing & Quality Control

• ISO 9001:2015 and IATF 16949 certified production lines
• 100% dimensional inspection against OEM drawings with CMM (Coordinate Measuring Machine)
• Magnetic particle testing (MPT) for surface crack detection
• Material composition verification via spectrometry (OES) analysis
• Case-hardening depth verification via micro-hardness testing
• Batch traceability with full quality documentation package
• 12-month warranty against manufacturing defects

Installation Notes

• Always replace countershaft bearings and seals simultaneously
• Check gear and synchro ring condition before installing new countershaft
• Apply recommended thread locker to bearing retaining bolts (Loctite 243 or equivalent)
• Torque main bearing cap bolts to OEM specification (typically 180-220 Nm)
• Verify end float after assembly (0.05-0.15mm recommended)
• Run a transmission bench test before vehicle installation
• Use OEM-approved transmission oil (SAE 80W-90 or API GL-4) for break-in

Ordering, Packaging & Shipping

• Export-standard packaging with VCI anti-corrosion wrap and shock-proof wooden crate
• Shipping via DHL, FedEx, UPS (express, 3-7 days) or sea freight FOB Shanghai/Ningbo
• MOQ: 1 pc sample supported; bulk orders (10+ pcs) eligible for volume pricing
• Lead time: 7-15 working days for stock items; 20-25 days for custom batch production
• Bulk orders: Request a quote for best pricing and delivery schedule

FAQ

What ZF transmission models does the 1358203238 countershaft fit?

The 1358203238 countershaft is primarily used in ZF 16S-109, 16S-151, 16S-130, 16S-2221, 16S-2520, and 12S-2210 series transmissions. These are commonly found in MAN TGA/TGS/TGX, DAF XF/CF, and IVECO Stralis/S-Way trucks. Contact us with your transmission model number for exact compatibility confirmation.

What is the difference between OEM ZF and aftermarket versions?

Genuine ZF OEM countershafts are manufactured by ZF or its licensed suppliers. Our aftermarket alternatives are made to OEM specifications using the same material grade (20MnCr5) and heat treatment process, with 100% dimensional inspection. We recommend OEM for warranty-sensitive applications and our high-quality aftermarket option for cost-conscious bulk orders.

What material is the 1358203238 countershaft made of?

20MnCr5 or 20CrMoH case-hardened nickel-chromium alloy steel, with a surface hardness of HRC 58-62 and case depth of 0.8-1.2mm. The core maintains HRC 30-38 for toughness and impact resistance.

Do you provide sample orders for testing?

Yes, sample orders of 1 pc are supported. We can ship via DHL Express for quick delivery (3-7 days). Contact us with your shipping address and preferred courier for a sample quote.

How do I verify the 1358203238 countershaft fits my transmission?

Send us your vehicle VIN or transmission model/serial number, and our technical team will cross-reference the OEM number against our database. We recommend checking the tooth count, overall length, and bearing journal positions against your original part before installation.

What is the warranty on the 1358203238 countershaft?

Standard 12-month warranty against manufacturing defects, including material defects, case-hardening failure, and dimensional non-conformance. Extended warranty options are available for bulk and contract orders.