What part number is the Art Carr E4OD valve body improvement kit?

The document identifies the kit as Art Carr PART# 21001, an E40D Valve Body Improvement Kit.

How many springs does the kit install and where?

The diagram shows three callout locations, each instructing to install 1 supplied spring in a specific valve train of the E4OD valve body.

What is the difference between the orange and yellow springs?

Per the note: orange springs are for moderate shifts, yellow springs are for harder shifts, and only one color should be installed.

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Art Carr 21001 E4OD Valve Body Shift Kit Instructions - Spring Locations Diagram

Exploded view of an E40D valve body improvement kit with spring install callouts

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Exploded parts diagram of an Art Carr E40D valve body kit (part 21001) with spring installation instructions.

AI caption June 2003 · Photo 6 of 11

This document is an instruction sheet for the Art Carr Performance Transmission Products E4OD (E40D) Valve Body Improvement Kit, Part# 21001. It consists of an exploded-view diagram of the Ford E4OD automatic transmission valve body, showing the valve body castings, separator plate, and several disassembled valve/spring trains. Arrows and callout labels indicate three locations where one supplied spring is to be installed in each valve train; the labels state "INSTALL 1 SUPPLIED SPRING HERE." A partially cut-off note indicates the supplied springs are used in conjunction with factory springs and that no factory springs should be removed. A note at the bottom explains the tuning options: orange springs produce moderate shifts, yellow springs produce harder shifts, and only one color of spring should be installed. A reader can learn the kit part number, the three spring installation points within the valve body, and how spring color selection determines shift firmness. The left margin of the scan is clipped, truncating the first letters of some callout text, but the meaning remains clear.

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Frequently asked questions

What part number is the Art Carr E4OD valve body improvement kit?: The document identifies the kit as Art Carr PART# 21001, an E40D Valve Body Improvement Kit.
How many springs does the kit install and where?: The diagram shows three callout locations, each instructing to install 1 supplied spring in a specific valve train of the E4OD valve body.
What is the difference between the orange and yellow springs?: Per the note: orange springs are for moderate shifts, yellow springs are for harder shifts, and only one color should be installed.
Do I remove any factory springs when installing this kit?: No. The instructions state the supplied springs are used in conjunction with factory springs and say 'DO NOT REMOVE ANY SPRINGS.'