Can someone tell me what viscosity the fluids are for the transfer case and differential in a '97 ORP? I want to stop at the store on the way home today so that I don't have to make another trip out.
Thanks.

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1997 F-150 4X4 ORP, pacific green, 4.6L, K&N filter, DeflectaShield bug shield.

 

You must use 75-140 SYNTHETIC in the rear if yours has a limited slip along with friction modifier. I ordered Redline from Summitracing, along with a trick aluminum cover from TrickFlow. Could not find any of the gear oil locally. Do a search on this topic in this thread and you'll find some interesting info. Very easy to change. Use a gear lube pump and make sure your oil is left in the house to warm up before you start to pump it or it'll take forever!!!

Good Luck,

JBRIII

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97 SC XLT 4.6L
K&N Gen II FIPK
75MM BBK TB
Gibson Super Truck Exhaust
Hypertech Chip
Steel Horse Upper and Lower Billet Grille's

 

t-case uses MERCON ATF. do not use gear oil in it. you WILL damage it.

 

DaveK,
For your T-case, do not use gear oil in your T-case. The Mfg recommends ATF Mercon. This would be my recommendation during warranty also. If you are hard on your truck, or are not in warranty and want a better oil for your T-case then you can use an oil called Lubrication Engineers (LE) 7500. This fluid has much less wear rates than a Mercon fluid has. It will make your T-case quieter and smoother and will make it last longer.

As for your gear oil. The Mfg. says that you should use synthetic 75w-140 gear oil. I cannot tell you to void your warranty, sy me recommendation during warranty would be the LE 75w140 #9920. A company called Mag-Hytec had some gear oils tested. Some of them are Amsoil 75w90 synthetic, Amsoil 75w-140 synthetic, LE 75w-140 synthetic, LE SAE 90 petroleum. The LE SAE 90 had 22.83 times less wear than the Amsoil 75w-140 and 18.25 times less wear than the LE 75w-140 synthetic. The only reason that I would use anything else other than the LE SAE 90 #607 would be warranty or cold temps, lower than 0 deg F.

These products are sold by a company called Mag-Hytec at 1-818-786-8325

Sincerely, Kevin

 

Thanks, folks. I got it changed last night. My local auto parts store stocks Amsoil so that's what I used. One strange thing, though. I pumped out a little over 2 quarts of fluid an managed to put in a little over 2 1/2 along with the 8 oz. of friction modifier. I didn't see any leaks anywhere. Anyone else experience this?

 

See my post about the pinion seal failure. Mine was leaking right at the yoke. Suspicious of the liklihood of it re-occurring.