Changing fluids

[Quahitis]

Hello all! I'm new to the forums and have a few questions about fluids for my jeep.

I recently purchased a 98 Wrangler with about 130k on it. It has the 4.0L, 5 speed transmission, Dana 30 front, Dana 35 rear. I'm planning to change all the fluids this weekend and I want to know what is recommended. I've decided on the following fluids already (I think) but I'm open to suggestions.

Engine: Mobil 1 or Red Line 10w30
Transmission: Red Line MT-90
Transfer Case: Red Line Synthetic ATF
Differentials 30/35 (I have ARB lockers front and rear): Red Line 75w90 or 75w140

Thanks

 

[Utah_jeepster]

I can only make a few suggestions since I have a 3 speed automatic, but I would go with a 5w30 synthetic on the motor oil due to your jeeps higher mileage, even at 75K that is all I run in my 2001 4.0. I go 7500 miles between oil changes, after doing a 5000 change going to synthetic.
as for the diffs with your ARB's, 75w90. the 75w140 is for competition/extream use, or in a extremely hot part of the country all year long.

 

[jfrabat]

I can only make a few suggestions since I have a 3 speed automatic, but I would go with a 5w30 synthetic on the motor oil due to your jeeps higher mileage, even at 75K that is all I run in my 2001 4.0. I go 7500 miles between oil changes, after doing a 5000 change going to synthetic.
as for the diffs with your ARB's, 75w90. the 75w140 is for competition/extream use, or in a extremely hot part of the country all year long.

In the case of the engine oil, I would say the viscosity will depend on the weather you live in; I live in Miami (it is always hot), so a 5W-30 is too thin for here, so I typically run wither Castrol Syntec 20W-50 or Mobil 1 10W-30 (the Castrol is not always available, but it is my first choice). But the colder it gets, the lower you want to go...

For the diffs, I agree with Utah. The rest you have it down already...

 

[Quahitis]

Thanks for the info guys