Added Tow package on Rubicon Diesel?

[rocky4by]

Well I was just looking at my build sheet and see that the tow package was not added. Could have been be me or the dealer that didn't add it, but either way where it states: Heavy-Duty Engine Cooling what does that entail? The rest of the tow package I can add myself. I also have a few other questions about the axles, is there a front lock out hub kit available? and if I did ever want to go with True Trac instead of the electric lockers will they fit in Rubicon axles?
Thanks for any information.

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[khockey02]

Heavy duty cooling is just a high output radiator fan and 240 amp alternator to run it. If it’s a rubicon, then you already have the wider axles and locking diffs instead of the lsd. If it’s a sport than you have missed out on a few additional goodies.