Before adding a lot of fluid, drive it for about 15 miles to get the transmission fluid up to operating temp (170*F). Then park the Heep on somewhat level ground, set the parking brake, engine idling in park, check the fluid level on the dipstick.


The fluid level should be at, or just below, the full mark, not above. Do not over service it.


You should be using Dexron III/Mercon (DEX/MERC) transmission fluid.

 

I used this to top mine off a couple months ago, but have not driven it since, aside from turning it around in the driveway. Like said, use Dexron 3/Mercon. Do not use anything else.

Attachment 305071

 

/scratching head/

If that method is valid, why do the manufacturers bother with the rigamarole of having us check it while hot? It would be much easier to walk out to my vehicle in the morning and check both the engine oil and the trans before I start the engine.

 

It's not the correct method for checking hot fluid. It's strictly for checking cold fluid.

 

I got that part. But if it gives a valid reading, why bother with all the "get it hot first" rigamarole?

 

Oh ye of little faith - If we have data, let’s look at data.

Here's some data you can digest.....


Owner's Manual:



.
AW4 Maintenance Manual:



.
Obviously the reference to the type of fluid is old. Dexron III/Mercon has superseded what's referenced. The AW4 Maintenance Manual was published in 1988 when Mercon was the fluid of choice, and the Owner's Manual in 1999.


And, note that the '99 Owner's Manual says to place the shifter in Park. Let's not argue about this.

 

Ken, you are not understanding my question. I'm not suggesting the method is invalid.

I'm asking, if the cold method is valid, why bother with taking the time to get the vehicle hot? Why is that better?

 

For a more accurate reading. The cold level check is just an estimate because of varying levels at varying temperatures.


Read the Owner's manual page again. Second paragraph down on the right.

"Remember, it is best t check the level at normal operating temperature."