New 2000 4.4 owner

[919e53]

Good morning all and thank you for the substantial help that was provided previous to my purchase already. Just picked up a 2000 4.4 with 86k miles and am extremely pleased with it thus far.

Few questions for you all. When cruising at highway speeds the vehicle seems to "surge" almost like it wants to go to a non existent higher gear. No change in RPM, just more of a seat of the pants feeling moreso than anything else. No codes, no weird noises just an odd minimal surge. Any ideas?

Also this think tends to drip a ton of condensation for a long period of time when parked after running the AC. Is this normal?

The front wheel arches, are they the came between both the normal and IS models?

Fluid change, sans oil and coolant, amongst the plethora of records for the vehicle it seems as if the diffs, tranny and TC are all original. Should I jump on this immediately?

Thanks again guys!

All in all great truck, not quite the M5 or E55 Ive had in the past but I have a plan that will change that