High Capacity 6 in Replacement Transmission Filter Kit (2-Pack)

In this review of the High Capacity 6 in Replacement Transmission Filter Kit the bottom line is clear: this kit is for technicians and owners who need a reliable, full-service filter change for Allison 3000 and 4000 series transmissions. The reviewer found the kit stands out because it provides two complete filters plus all required gaskets and o-rings, reducing downtime and ensuring a proper seal on reassembly. Built to match Allison P/N 29545779 in fit and function and manufactured in the USA to ISO standards, this kit is primarily about long service life and contamination control.

Key Features

• Direct interchange: Compatible with Allison P/N 29545779 so the filters install without modification and preserve factory fit and sealing surfaces.
• Complete kit: Includes two filters and all required gaskets and o-rings so a single purchase covers a full filter change on dual-filter applications or a spare for next service.
• High capacity media: Glass media and a Beta ratio of 200/20.7 provide high dirt-holding capacity and help protect transmission components from abrasive particles.
• ISO manufactured: Produced under multiple ISO specifications, which supports consistent quality control and predictable performance in service.
• Made in USA: Domestic manufacture can simplify sourcing and provides traceability for fleet maintenance programs.

Who It's For

This kit is aimed at fleet managers, owner-operators, and independent diesel shops that maintain Allison 3000 and 4000 series transmissions and want a direct replacement that matches OEM fit, form and function. The inclusion of two filters plus gaskets suits vehicles that use dual filters or technicians who prefer to carry a spare for rapid service.

Those who should look elsewhere are buyers needing a different micron rating or a performance aftermarket filter designed specifically for extreme racing, since this kit focuses on durability and OEM compatibility rather than exotic performance tweaks.

Pros & Cons

Pros

• Directly compatible with Allison P/N 29545779 for straightforward replacement without adapter parts.
• Two filters plus gaskets and o-rings make the kit convenient and cost-effective for complete service.
• High capacity glass media and strong Beta ratio improve particle capture and extend service intervals.
• Manufactured to ISO standards and made in the USA, supporting consistent quality control.

Cons

• Not marketed as a specialized high-flow or racing element, so users needing extreme performance filters may prefer a different product.

Specifications

Brand	Big Filter
Compatible OEM Part	Allison P/N 29545779
Filter Height	5.98 in
Top OD / Bottom OD	3.21 in
Top ID	1.54 in
Media Type	Glass
Micron Rating / Beta	20 micron / Beta 200/20.7

Our Verdict

The High Capacity 6 in Replacement Transmission Filter Kit is a practical, value-oriented choice for anyone servicing Allison 3000-4000 transmissions who wants assured OEM compatibility and a complete parts package. With robust glass media, ISO-controlled manufacture and two filters plus seals included, it delivers reliable contamination control and simplifies routine maintenance.

Frequently Asked Questions

Is this kit a direct replacement for Allison filters?
Yes, the kit is compatible with Allison P/N 29545779 and is designed to match OEM fit, form and function.

What fluid types is the filter rated for?
The filter is specified for HH, HL, HM and HV transmission fluids according to the product details.

Does the kit include gaskets and o-rings?
Yes, the kit includes all required gaskets and o-rings for a complete filter change and comes with two filters.