Welcome to the Herd; lots of friendly knowledgable folk in these forums!
Best to learn weaknesses\needs of V6~4.0L~SOHC drivetrain:
* JunkPlastic ThermoStatHousing, AllMetalUpgrade or renew as needed
* JunkPlastic HeaterControlValve AllMetalUpgrade or renew as needed
* JunkPlastic RadiatorTanks AllMetalUpgrade or renew as needed
* Engine TimingTensioners, renew every 100kMiles\12Yrs
* Engine Oil+Filter every 5kMiles\6Mths
* 5r Transmission Filter+PanGasket+MerconV+BandAdjust every 33kMiles\4Yrs
* 5r Transmission ODToggleCable In SteeringColumn, NotoriousFailureItem
* 1354 TCase MerconLV every 33kMiles\4Yrs
* 1354 TCase 4x4ShiftMotor NotoriousFailureItem
* 1354 TCase 4x4ConMod NotoriousFailureItem
* Differentials 75w140\75w90 GearOil every 33kMiles\4Yrs
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