
pulled that up a steep mountain pass with the stock fan clutch and no GDE tune....
a few months later I had to take the head off and:
Change the head gasket
Change the lifters / rockers
Change the glow plugs
Clean the intake (VW style)
So the GDE tune is not optional (EGR delete)
And the fan clutch upgrade is not optional
one thing to keep in mind....
There is an electric fan on these jeeps..... under normal driving conditions you would never notice a dead fan clutch..... but when you add 3500-6000 lbs to the equation, the extra air provided by the mechanical fan is NOT optional......
The torque converter is kind of a grey area....
If you don't load the engine down in top gear, it's no problem... if you press your over-drive button, let the engine rev higher on inclines the stock TC will hold up..... jeep be sure to change your oil a little sooner because of the added revs.....
if you DO load the engine down in top gear with the TC in lockup (especially if you have a "full torque" eco or hot tune), your lockup clutches will start to slip.... this will create a "shudder" that's very distinct and very obvious.... if you want to solve THAT, you need to upgrade your TC (the boat I'm currently in)