4.2 Inch Replacement Transmission Filter Kit for Allison 3000-4000

In this review the focus is on a practical replacement option for technicians and fleet owners who maintain Allison 3000 and 4000 series transmissions. The 4.2 Inch Replacement Transmission Filter Kit from Big Filter is presented as a direct interchange with Allison P/N 29526899 and the bottom line is simple: it delivers a complete, made-in-USA filter service kit with high capacity filtration media so you can perform a full transmission service without sourcing separate gaskets or o-rings.

Key Features

• Direct interchange: Compatible with Allison P/N 29526899 in form, fit and function, so installation follows the same steps as the OEM filter.
• Complete kit: Includes two filters plus all required gaskets and o-rings, giving technicians everything needed for a single filter change without extra parts hunting.
• High capacity media: The glass media and specified beta ratio provide reliable particle capture to help protect the hydraulic circuits of Allison 3000-4000 transmissions.
• Made in USA: Manufactured under ISO controls in the United States, which supports consistent quality and traceable production standards.
• Durable construction: Designed for high durability and resistance to flow fatigue, reducing the likelihood of premature failure between services.
• Fluid compatibility: Rated for HH, HL, HM and HV fluids so it suits the common transmission fluid types used in these Allison models.

Who It's For

This kit is best for fleet mechanics, independent repair shops, and owner-operators who maintain Allison 3000 and 4000 transmissions and prefer a direct-replacement, OEM-compatible filter option. The inclusion of two filters and a full set of seals makes it especially useful for scheduled maintenance intervals where minimizing downtime matters.

It is less suitable for someone who needs a single-piece specialty filter or an aftermarket performance element with different micron ratings; those buyers should verify specific micron or flow requirements before choosing this kit.

Pros & Cons

Pros

• Complete kit saves time by including two filters and all gaskets and o-rings for a full service.
• Direct interchange with Allison P/N 29526899 ensures fit and simplifies installation for trained technicians.
• Manufactured to ISO specs and made in USA, supporting consistent quality control.
• Glass media and a strong beta ratio offer good particle removal for transmission protection.

Cons

• Limited to the specified micron rating and media type, so users requiring a different filtration rating must check compatibility.

Specifications

Filter Type	Transmission
Product Media	Glass
Height	4.21 in
OD Top / Bottom	3.21 in
ID Top	1.57 in
Micron Rating	20
Fluid Type	HH / HL / HM / HV

Our Verdict

The Big Filter 4.2 in replacement kit is a sensible, value-oriented choice for anyone servicing Allison 3000-4000 transmissions who needs a complete, OEM-compatible kit. Its made-in-USA production and ISO-guided manufacturing make it a dependable option for routine maintenance, and the included seals and two filters reduce procurement steps for shops and operators.

Frequently Asked Questions

Is this kit a direct replacement for Allison P/N 29526899?
Yes. The filter kit is compatible in form, fit and function with Allison P/N 29526899.

What fluids is the filter compatible with?
The element is rated for HH, HL, HM and HV fluid types commonly used in Allison transmissions.

Does the kit include all seals needed for a service?
Yes. The package includes two filters plus all required gaskets and o-rings for a complete filter change.