RF1A Gear Driven REMANUFACTURED Crawl Box with Marlin Crawler internals.
Assembled Crawl Box feature 2.28 or 4.7 gear ratios. They are available with 21 or 23-spline input and output shafts and with your choice of shifter style.
Match the transmission output shaft spline count and the transfer case input shaft spline count, they will either be 21 or 23-spline, see the chart below for application guide. You can choose the shifter style to also match the transmission and application you are using.
All transfer cases and crawl boxes do not include shift levers.
This crawl box is rebuilt with Genuine seals, KOYO bearings.
All transfer case pieces are glass beaded and all surfaces are machined flat, to ensure a perfect seal.
Input Spline: 21 or 23
Gear Ratio: 2.28:1 or 4.7:1
Shifter Type: Top, 4 Inch Forward, or 4.5 Inch Forward Shift
Output Spline: 21 or 23
Transmission Compatibility Information:
Trucks equipped with V6 engines and Turbocharged 4 Cyl engine will have 23-Spline output shafts and will require 23-spline input on the transfer case. All other engine applications will be 21-spline. Note: The R150F that was equipped in the 1988-1995 3VZ-FE V6 trucks will require an addition adapter to run dual cases.
|YEAR(S)||TRANSMISSION(S)||INPUT GEAR||SHIFTER OPTIONS||Engine|
|1979-1983||L43/L45/L50/L52||21-Spline||Top Shift||20R, 22R|
|8 of 1983-1988||G52/G54||21-Spline||Forward Shift-4.5″ Offset||22R|
|1986-1987||R151F||23-Spline||Forward Shift-4.5″ Offset Or Top Shift||22R-TE|
|1989-1995||W56-C/D/E||21-Spline||Forward Shift-4″ Offset||22RE|
$350 Core Charge
This Crawl Box has a 1 Year Warranty
10 Day Lead Time
Installation of Dual Cases will require modifications of drivelines and floorboards.