I would like to change these fluids over to synthetic if possible. What would be the proper brand/type to use in each of these.

My friend has indicated that Mobile 1 would be the best to use.

Transmission and transfer case requires Mercon.
The diffs require an oil stabilizer as well as the oil.

Veh. Specs

4.0L SFI (eng vin code X)
Transmission (trans code D) 5 speed auto (control trac 4x4)
Diff code(was told to me from the local shop), that I have a limited slip diff. thats why Im inq. about the stabilizer I need to add to the diffs.


If its not too much trouble, please explain how to drain and refill the Torque converter (do I/or how do I find out if i have a drain plug on this)


Thanks a million.

Dave ( Exp4Life )

 

Welcome new user.

I have used Mobile 1, Valvoline Synthetic, and Texaco Synthetic. I like them all and use them all. I have an artificial ranking of my engines so I use different stuff with each. I use Mobile 1 in my Chebby engine since that engine type comes from the factory with Mobile 1, plus I have used M1 the longest since it has been around for a long time.

I use Valvoline in my Truck since I have always liked Valvoline but they didn't have a synthetic until the last few years. I use Texaco in my wife's van and all my garden equipment since it is a buck cheaper and I don't feel as guilty using a synthetic in an engine that probably isn't seeing hard use.

To answer your question... Use the API and SAE specification oil that is called out in your manual. Most synthetic companies make a Mercon equivalent, pick which ever brand you like, but be sure which type of Mercon you need(I think there is I, II and III).

The limited slip differntial requires more care. Some synthetics DO NOT recommend themselves. I have used Mobil 1 since it does say OK for LS diffs. I use 2 tubes of limited slip additive from StaLube, it meets the appropriate Chevy and Ford spec. It usually comes in a toothpaste tube. I use two tubes because the truck diff is big and the Chevy site says that two tubes are required to elimiate noise with synthetics. I have found this to be true in my Chevy.

I don't know if you have a drain plug on the TC but if you do, you would drain it by removing the sheetmetal cover on the bell housing. Then you turn the TC by hand or use a TC wrench. BE SURE THE ENGINE CANNOT START. Turn the TC til the plug is at six o'clock and drain it. Then To refill I recommend turning the TC so that the fill hole is as high as you can get it but still reach with the filler tube from a pump on the ATF bottle, BTW make sure you have a pump. If you don't have a plug there are tricks you can try to empty the TC but they can be involved so I won't go into it here.

Good Luck,
Jim Henderson