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You need to go to the TM section here and down load the -20 series. It has the complete procedure detailed.

This is to scale. The fill plug is further below the center line of the axle than I thought. The weld on the axle tube is a good indication of the CL in case you are wondering.

Use an IR thermometer to make sure it's not a gauge issue. If it doesn't warm up, change the thermostat, easy to do on the NHC 250. My M929 is at operating temperature after about 10 miles.

For cleaning out the housing, using one of the sand blasters that have a suction tube you stick in a bag works well. Get 5 gallons of kerosene and put the suction tube in the container. Washing from the outside in is easiest but you can do it however you like. The air and kerosene does a good...

Here are pictures from the LO for the M915A1 which uses all modern heavy truck civilian style steer and drive axles. The front steer axle uses wet hubs. The oil level is not halfway up the spindle, it is below the spindle. The rear drive axles fill plug is below the axle center line...

Another welcome from Florida!

Since I have taken 2.5 ton and 5 ton hubs apart and found they were full of oil (and running very cool by the way), I don't really think the axle oil level needs to be any higher than is it is. If you think about it, the ring gear is churning the oil up and it will flow out to the hubs. Also...

I hope he gleaned some useful information whether he liked what he saw or not.

1800 miles round trip in two different trips. Out bound in a F350 both times and 1st return in a M929 and second in a M915A1. Note to self, roads in LA and MS SUCK.....

Probably the biggest reason you don't see Detroit lockers in the front axle is because it takes a certain amount of traction to make them unlock in a turn. If you have poor traction, they won't unlock in a turn and then the front tires are going to slide. If the front tires are sliding, they...

The dip sticks are different lengths depending on oil pan depth. I posted a couple of Allison TMs in the TM forum here, one of them gives info on fluid levels based on pan depth.

When the transmission is cold it will read low. If your dip stick doesn't have a cold fill mark be aware of that. The level comes up as the fluid gets hot.

I found that as I got older, I didn't care what others thought. It's a lot easier when you only have to make you happy.

There are horses..... If there's horse poop everywhere it will be just like the GA Rally used to be!

It's not called the Taj Mahal for nothing!

Let them change the engine. Greyhound can get you back and forth.

Use the 99% isopropyl alcohol. It will work better at absorbing the water. Just make sure that nothing in the transmission is affected by the alcohol. Plus, you can't run it long, the alcohol will evaporate as the transmission gets hot and leave the water in there. I hope your next birthday is...

Just pull the heads if you think it's a head gasket. You can see if the head gasket is leaking, if not, get the heads checked for cracks. Either way it requires taking the engine apart. If you really need to use the truck, follow patracy's and others advice and use some kind of stop leak and...

People have done it. Keep in mind the M129 is heavy and tall.

It never fails to amaze me how useful hammer technology can be when applied correctly.... And even if it doesn't work, you get the satisfaction of beating the snot out of something!