Pure Diesel Power, your number 1 diesel performance parts source!

Pure Diesel Power Price Match

live chat service provider

PDP Phone Number

PDP Email Signup


Free shipping on all orders over $150! Free Shipping on orders over $150! *Exclusions Apply

Sonnax 4R100/E4OD Ford Powerstroke Shift Improvement Kit

Sonnax 4R100/E4OD Ford Powerstroke Shift Improvement Kit

From Sonnax Sonnax




The sonnax shift improvement module consists of three Tricumulator™ springs, designed for all E40OD and 4R100 Transmissions from 1991-2003 (where no short inner springs were used). This is by far the only shift improvement you will ever need! And “A Must For Every Rebuild ". The springs increase the line pressure in the transmission to firm up the shifts and make them happen faster.
Feel seat of the pants performance from your sluggish transmission!

Sonnax now offers the line pressure modulator sleeve and valve kit, which eliminate this oil loss problem with closely-held tolerances.
The sleeve has been manufactured out of carbon steel and the valve from hardened alloy steel to prevent excessive wear.
The sleeves have an O-ring added, similar to the AX4N style, to help prevent excessive EPC oil loss.
The valves incorporate annular grooves to properly center the valve in the sleeve and eliminate side loading, which can lead to excessive wear.
The outside diameters of the sleeves are the same, so the kits may be used in either of the E4OD, 4R100 or AX4N.

No posts found

Customers Also Bought