4.2 in Replacement Transmission Filter Kit with Gaskets and O-Rings

In this review of the 4.2 in Replacement Transmission Filter Kit from Big Filter the bottom line is clear: this kit is aimed at technicians and fleet owners who need a reliable, complete service replacement for Allison 3000 and 4000 transmissions. The reviewer found the kit valuable because it includes two high capacity transmission filters plus all required gaskets and o-rings, so a full filter change can be completed without hunting for parts. The product stands out for compatibility with FLEETGUARD P/N HF35152 and for being manufactured in the USA to ISO-guided processes.

Key Features

• Direct interchange compatibility: Built to match FLEETGUARD P/N HF35152 in fit, form and function so installations align with OEM expectations.
• Complete kit: Includes two filters and all necessary gaskets and o-rings, allowing a full service without additional purchases.
• High capacity media: Uses glass product media with a Beta ratio of 200/20.7 for effective particle capture and longer service intervals.
• Manufactured in the USA: Produced to ISO specifications to support consistent quality and reduce risk of manufacturing defects.
• Wide fluid compatibility: Rated for HH, HL, HM and HV fluid types so it matches common Allison transmission fluids.

Who It's For

This kit suits fleet maintenance shops, heavy equipment owners and independent technicians who service Allison 3000 and 4000 series transmissions and need a reliable replacement that mirrors the original filter. Because it contains two elements and all seals, it is especially useful when performing scheduled maintenance on multiple vehicles or keeping a ready kit in the parts room.

It is less suited for casual DIYers who only need a single filter and do not plan to work with transmission fluids regularly, or for vehicles outside the Allison 3000-4000 application range where fit and function cannot be guaranteed.

Pros & Cons

Pros

• High capacity glass media delivers strong particle removal and good dirt holding due to a 20 micron rating and Beta 200 performance.
• Complete kit including all gaskets and o-rings reduces downtime and ensures correct sealing at reassembly.
• Manufactured to ISO standards in the USA, which supports consistent build quality and traceability.

Cons

• Kit is specific to Allison 3000-4000 transmissions and FLEETGUARD HF35152 interchange; it will not fit other transmission families.

Specifications

Brand	Big Filter
Compatible Part	FLEETGUARD P/N HF35152 (interchange)
Filter Height	4.21 in
Media Type	Glass
Micron Rating	20
Beta Ratio	200/20.7
Fluid Types	HH / HL / HM / HV

Our Verdict

This two-filter replacement kit is a practical, cost-effective choice for professionals maintaining Allison 3000 and 4000 transmissions. With high capacity glass media, full gasket and o-ring coverage and ISO-guided manufacturing in the USA, it delivers dependable performance and reduces parts chase during service.

Frequently Asked Questions

Is this kit a direct replacement for Fleetguard HF35152?
Yes, the kit is designed as a direct interchange with FLEETGUARD P/N HF35152 in fit, form and function.

How many filters are included?
The package includes two transmission filters plus all required gaskets and o-rings for a complete change.

What fluids is this filter compatible with?
The filter is suitable for HH, HL, HM and HV transmission fluid types.