Drivetrain› Automatic Transmissions and Components

Sonnax

Heavy Duty Input Shaft

$1,024.55

SKU: 22121B-01

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Special Order
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$100 Minimum Order
30 Days Return
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Overview

The Sonnax Heavy Duty Input Shaft is a performance upgrade designed for Chrysler A618, 47RH/RE, and 48RE transmission units. It features a robust one-piece design that integrates the input shaft and forward clutch hub, eliminating the weak connection found in OE two-piece designs. This shaft is custom forged from ultra-high-strength 300M billet steel for enhanced durability.
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The Sonnax Heavy Duty Input Shaft, part number 22121B-01, is engineered for demanding Chrysler A618, 47RH/RE, and 48RE transmissions. This robust upgrade replaces the original two-piece shaft and hub design with a superior one-piece construction, which merges the input shaft and forward clutch hub to eliminate a common failure point. Crafted from ultra-high-strength 300M billet steel, the shaft's internal grain structure follows the part's shape, significantly increasing its overall strength and resistance to torsional stress. This custom forging process contributes to its reputation as a popular upgrade for high-performance Dodge trucks. The shaft features a 23-tooth input spline and a 62-tooth clutch spline, and it is designed to be compatible with OE seals.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSonnax
Part Number22121B-01
CategoryDrivetrain
5,000+ Trusted brands
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(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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