We Remove the 4 speed gear box and install a 5 speed H55 box from a 75 series, (same as 60 series).
We share how we did this mod.
You will need to swap over to 60 series handbrake on the rear before this conversion can be done, or machine up and install the rear drum brake setup from the existing 4 speed box. (Not my choice)
Thread Locker
https://www.chemtools.com.au/
TOOLS
https://www.toolking.com.au/
Carters Engineering
https://www.cartersengineering.com.au/
75 series Driveshaft yokes
https://www.allfourx4.com.au/
Chapters:
0:00 Introduction
1:20 measure and remove drive shafts
2:26 Checking 5 speed box and gears
3:35 Removing 4 speed box and crossmember
8:14 Comparing the 4 speed to the 5 speed
10:03 Installing the 5 speed
14:50 Drive shaft modifying and machining
17:48 Installing new drive shafts
19:37 First Test drive with the H55 5 speed