Drivetrain› Automatic Transmissions and Components

TransGo

Valve Body Repair Kit

$85.00

SKU: SK AX4N

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The TransGo SK AX4N is a valve body repair kit designed for Ford AX4N and 4F50N automatic transmissions from 1995 onwards. This kit addresses common issues such as rough shifts, 2nd clutch failure, and neutral conditions. It includes components for repairing the valve body and unit, along with a new pressure regulator boost valve, lock-up valve, and an accumulator spring.
Show original supplier description
The TransGo SK AX4N SHIFT KIT® is a comprehensive valve body repair kit engineered for Ford AX4N and 4F50N automatic transmissions, specifically for models from 1995 to the present. These include positive lubrication to the front planet gears, reduction of costly planet burn-up, rough light-throttle up and downshifts, and issues like falling out of 4th gear, sliding 1-2 shifts when hot, and 2nd clutch failure. It also addresses soft shifts above 1/2 throttle, neutrals at a stop, skipping 2nd gear when hot, and neutrals on corners. Included in the kit are essential components for a proper valve body and unit repair. These parts consist of a new pressure regulator boost valve with a bushing, a lock-up valve with a bushing, a forward control valve, and a high-pressure relief system. Additionally, the kit provides an 1-2 accumulator spring and components for internal lube upgrades, ensuring a more robust and reliable transmission performance. The SK AX4N is compatible with all AX4N and 4F50N transmissions from 1995 onwards. While general fitment is broad, specific revisions for 2004-on units are noted, and a separate pump plate (AX4N-PMP-PLT) is available for 2004-on models. Installation requires substantial disassembly of the transmission, as it involves working within the valve body.

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

BrandTransGo
Part NumberSK AX4N
CategoryDrivetrain
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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.

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