Recommended Oils and Flushing

[cjdon1854]

Don writes and I will take this moment to thank each one that takes time to be productive in this media, which every one here benefits.

I have read from my CJ5 tech manual that the (oil) fluids, in the rear axle , the Transfer Case , and the Transmission is 80W-90W SAE gear oil and the front end axle requires 140 SAE gear oil.

I want to drain the original gear oil. The 68 CJ5 has 36K original miles and service has been neglected. The Transmission is a 3 speed and the engine is a 225CI GM (Buick) engine.

Would any one recommend a brand of oil. and if flushing would be helpful.
The vehicle brakes, steering linkage, and brakes are going to be serviced A.S.A.P. Is there any advice on what type pf brakes should I get. Stock verses a disk brakes. I will likely use the vehicle as it has been used in the past on the local dirt trails and our wooded areas. No extreme sports for this CJ5 .

The passenger side cylinder near the fire wall as a issue. When the weather dips into the low 20 degree, I have found anti freeze fluid leaks into this cylinder (after it sits for a while) and will foul the spark plug out in a week of use. The problem is not obvious when weather is 40 degrees plus.

Heater, radiator, hose belts, alternator, regulator, plugs, wires, cap and rotor has been replaced. Engine runs very well. I will also have to replace the clutch. The transfer cases inside sector shifter is frozen.

I have a lot of time to do the work. Where do I start ! July 17, 2011. Don

 

[mylittlecj5]

Well I wouldn't change the engine oil until you figure out where that anti-freeze is getting into the cylinder at. Sounds like it may need a head gasket or (my guess) it has a cracked head.
By pulling the heads to isolate that problem, any oil you change now will be trashed, so save that for later.

You really don't have a choice on what type of brakes you get, you have drum brakes all around on that year. Just change them out, install new hardware kits, turn the drums, pack the bearings and check the rest of the steering while you are there.

Drain all the old fluids out of the drivetrain as well as you can (overnight drip draining works good) then re-fill with fresh oils. Check the old stuff for metal or contaminates before you recycle it (don't mix the old oils, some recyclers don't like that).
I'd pull the Transmission /Transfer Case before I changed that oil also. That way you can open up the Transfer Case (if needed) to free up that sticky shifter. then replace the clutch, install and refill with the proper oil.