Fluids.

[Cduke88]

Hello. I have a 84 CJ7 Renegade with AMC 258 i6 / 4.2l , T-4 , 300 Transfer Case and stock axles. Not sure of type. The jeep is none stock with 45000 original miles on it. I want to change al the fluids except motor oil. I have been reading a bit on here but still cant narrow it down. Some say stick with atf in Transmission and some say gear oil. Also am towing it about 120 miles. Last time I dropped rear shaft but done remember it I locked hubs or had tf in neutral or transmission in gear. Thanks for the advice in advance.

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[Torxhead]

The use of ATF in the late model CJs was a big screw up by AMC. For the tranny and Transfer Case use SAE 85-90 wt gear oil. For flat towing, the tow bar set-up will work, I would advise dual chains also. The owners manual states for manual Transmission is to have the hubs locked, t-case in neutral, tranny in gear, steering wheel unlocked. Then every 200 miles to run the engine for one minute to lubricate the t-case. Or drop the rear driveshaft. After flat towing for a while you can feel just how warm the transfer case gets as it is poorly lubricated during flat towing. A good front wheel alignment helps and have the tow bar mounted level or down a bit on the tow ball end. Don't slam on your brakes either as the forward momentum can break the hold down mechanism on the tow bar. You are towing a vehicle weighing around 4,000 lbs with no trailer brakes.
Edit: Looking at your pics, it does appear that you have locking hubs in the rear. So you could just unlock those suckers and flat tow all day long.

 

[Cduke88]

I wish they locked. Just hubs. Do you need to lock front hubs if you drop driveshaft? That is my main concern.

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[hole]

When I first got my 8 it had some kind of heavier gear oil in the T-5 . It regularly ground the 3-4 shift unless I gave it an extra second or two between shifts. It was also hard to get into gear when cold.After reading a ton of differing opinions (all of which have merit because it worked for them) I chose Synchromesh. No more grinding,regardless of how fast I shifted, it was easier to get into any gear (hot or cold) at any time. Cant say enough good about the stuff, and it greatly improved the driveablity up until I pulled it for a T19. IIRC 85/90 GL4 for the Transfer Case

 

[Lumpy Grits]

In the T-4 /T-5 use 75W-90 syn gear oil(I use Valvoline in mine).
AMC used ATF, against Borg-Warner's advice and burned up many T4/T5 trannys. BW would not warranty them, and AMC had to 'eat' those losses.
AMC had a special 'stink-oil' for the T4/&5 that hasn't been made in 20 yrs. I still have a case of it.
Do you have an LSD in the rear diff?
Otherwise, just std weight gear oil.
LG

 

[Lumpy Grits]

I wish they locked. Just hubs. Do you need to lock front hubs if you drop driveshaft? That is my main concern.

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I drop the rear DS at the pinion, and no hub locking is needed.
Just remember to unlock the steering wheel.
LG

 

[CJ]

Here is a great thread and illustration on towing a CJ. The post is about a Dana 20 Transfer Case but the same applies to a Dana 300 .

Front Hubs & Towing

I have always thought the front hubs should be unlocked when getting towed. This keeps the front axle and diff from rotating. Then I got TeraLow gears for my transfer case and the instructions say when towing to put the transfer case in neutral and lock the front hubs. They underlined it for...

jeep-cj.com

Transmission Case: