Dual Case Adapter Kit for 1979-1995 Toyota Pickup and 4Runner

This is Advance Adapter’s Heat Treated 356-T6 Aluminum Dual Case Adapter kit for 1979-1995 4cyl Toyota Pickup and 4Runner applications with 4- or 5-speed manual transmissions.

This kit is based on our original Marlin Crawler MC05 Dual Case Adapter design from 1995, but is upgraded with a longer heat treated coupler that passes through two separate & spaced apart 209RS main shaft bearings for extra coupler support. In fact, Advanced Adapters was our original adapter manufacture back in the 1990s and we stand by their forming and machining ability.

Kit includes the following:

Dual Case Adapter
Extended-length Coupler
Thrust Washer with detent ball
2x Sealed 209RS Main Shaft Bearings
Counter-shaft Cage Bearing
Snap Rings
Gaskets
Hardware
Instructions

Applications include:

21-spline (4cyl)
- 1979-1980 2.0L 20R with L43 or L45 4-speed manual transmission
  - Note for L43: You must slightly grind down the spline-stepping on your t/case input so that the coupler inserts fully over the full length of splines
- 1981-1995 2.4L 22R or 22R-E with L50/L52, G52/G54, or W56 5-speed manual transmission
23-spline (4cyl)
- 1986-1987 2.4L 22R-TE Turbo Pickup or 4Runner with R151F 5-speed manual transmission
23-spline (6cyl, requires extra adapter kit)
- While this kit fits 4cyl applications, the 23-spline version can be used behind a 1988-1995 3.0L 3VZ-E Pickup, 4Runner, or T100 with the use of a front bolt pattern conversion kit available separately here. This will also require a 23-spline input for the Dual Case Unit which is available separately as our XD Total-Spline 23-spline Input Gear or our Competition Total-Spline 23-spline Input Gear.

Additional Notes:

This is a Kit only. You will still need either a complete 1979-1995 4-cylinder gear-drive RF1A transfer case to use as core parts to build your Dual Case Unit, or you will need enough core parts from a RF1A gear-drive t/case to complete your Dual Case Unit. Required core parts include a front reduction housing, low range gear set, shift fork, rail, and drain plug.

Optional/Upgrade Parts:

If you need an extra set of Low Range gears to complete the build and would like to upgrade to what we refer to as The Ultimate, we offer Japanese-made Chromoly 4.70:1 Low Range Crawler Gears which may be used in your transfer case and your transfer case gears used to assemble the Dual Case Unit. Click here for details.

If you need a low range reduction housing, we offer a USA-made Heat Treated Aluminum Housing with upgraded supports and thicker, stronger walls. Click here for details.

If you need an extra drain plug, we offer Low Profile Drain Plugs that do not get snagged and loosened by rocks. Click here for details.

If you need an extra transfer case mount to take advantage of the Marlin Crawler Dual Case with dual-t/case-mount design, we offer a USA-made Heavy Duty & serviceable T/Case Mount. Click here for details.

Made in the USA

Weight	20
Dimensions	20 × 4 × 4 in
Brand	Advanced Adapters

Make	Model	Year	Notes
Toyota	4Runner	1984 - 1995	5-speed manual transmission
Toyota	4Runner	1986 - 1987	22R-TE with 5-speed manual transmission
Toyota	Hilux/Pickup	1979 - 1995	4- or 5-speed manual transmission
Toyota	Hilux/Pickup	1986 - 1987	22R-TE with 5-speed manual transmission

We appreciate your feedback! Please share your thoughts on the product itself, including its performance, design, and how it meets your needs.

Guidelines for Submitting a Review:

Account Required: In order to limit spam we ask that you please Log In first.
Focus on the Product: Please review the product's performance, durability, and how it fits your expectations.
Avoid Reviewing the Shopping Experience: If you have feedback regarding our website, customer service, or shipping, please contact us directly at Customer Service to help us improve this process of customer experience.
Be Honest and Detailed: Whether your experience was positive or had room for improvement, we want to hear about it.
Respectful Language: Please use respectful and appropriate language in your review.

What Happens Next?

Review Moderation: All reviews are subject to moderation before being published. This ensures that the feedback we share with our community is helpful, relevant, and focused on the product.
Private Outreach: If we receive constructive feedback, our team may reach out to you directly to better understand your experience and explore ways we can improve.

Thank you for helping us make Dual Case Adapter Kit for 1979-1995 Toyota Pickup and 4Runner even better!