Crawl Box with Trail-Gear Components

Description

RF1A Gear Driven REMANUFACTURED Crawl Box with Trail-Gear 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.

Features:

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.

TRANSMISSION CHART
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
1985-1988	W56A/B	21-Spline	Top Shift	22RE
1986-1987	R151F	23-Spline	Forward Shift-4.5″ Offset Or  Top Shift	22R-TE
1988-1995	R150F	23-Spline	Top Shift	3VZ-FE
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.