My V10 Transmission, factory gauge hardly shows any difference between 170 Deg and 230 Deg (measured with a SCAN Gauge II.

I wouldn't rely a whole lot on the factory gauge.

 

All I am saying is that the trans doesn't quit the cooling function when you put it in reverse.
That's enough graphics Stewart.

 

Like I said there is more pressure in reverse and supposedly there are more robust seals that will work better. I think Mark knows what brand. Heat does play a role in it but yours doesn't seem to require that.

 

But if the heat being created at a fast rate than to cooler can cool intern it's not cooling. If one gallon goes up 20 degrees and the cooler can only cool one gallon 10 degrees the heat will build fast

 

I'm not saying anything is cooling or heating, Stewart said the transmission cooling FUNCTION doesn't cool in reverse but I say it works the same in forward and reverse. I wish Mark would chime in.

 

No no no I got what your saying I just think the point he is trying to Make is if the cooler can't keep up it will heat up. I don't think he is saying the cooling circuit is actually shutting off just canceling itself out from heat build up

 

Could be, text is often deceiving which is why people are often taken wrong in spite of the emotion icons.

 

I'll use any graphic I want Brent, you have zero to say about it, capiche?

In this case reading comprehension escapes you Brent. Reread my posts. I was very clear in what I posted.

Stewart

 

Whatever

 

ya does anyone have a way to help me instead of acting like a bunch of women arguing ?!?!?! holy **** !! go change your panties already !

 

Cooling IS worse in reverse!

Look at the airflow being pushed into the grill going forward. How much is being pushed into the grill going in reverse? None. That's why cooling is worse in reverse.

Back to the original problem, heat is the problem. The factory gauge won't show it, and usually an aftermarket gauge won't show it, either. Going forward at very low speed with a big load will generate A LOT of heat in the torque converter. The stock torque converter hub seal will get HOT and relax, allowing fluid to leak. Sometimes a lot of fluid. Going in reverse is even worse because there is less airflow over the cooler.

There are a few things that will help. Replacing the stock seal with an aftermarket seal made from a material called Viton will help a lot. Viton maintains it's strength at much higher temperatures. Replacing the stock air to oil cooler with a cooler from a 6.0L truck will also help. DO NOT bypass the transmission cooler in the radiator, you can't afford to lose that cooling. For those that have a '99 or '00 truck that doesn't have a cooler in the radiator, consider replacing the radiator with one that has a cooler.

Another thing that will help is to put the trans in neutral and rev the engine a bit if you are doing low speed backing with a high load, such as a camper or in loose sand. That will get the hot ATF out of the cooler and keep it from getting too hot.

 

You need to find out what the actual trans temp is, both forward and reverse. maybe you are on the verge of overheating the fluid in drive, and when going in reverse on sand with the trailer puts it over the threshold for overheating and boiling the fluid. before anything else gets done, find out the actual temp!

 

You should probably air down your truck and trailer tires when you hit the sand, if you don't already. Skinny, high pressure trailer tires cut right down, and push the sand creating a lot of resistance. Try to stay on top. It makes a huge difference.

 

But you're never in reverse long enough to make any difference in heat plus the fan is still pulling air in, and driving slowly forward doesn't have any ambient ram effect either plus you are normally going much further forward. There is far from enough time in reverse to change any heating (unless you are stuck in sand or something), it's the increased oil pressure in reverse coupled with heat from overall driving that compromises the seal.

 

That's a good idea, but it won't help solve this problem.

The temperature is getting too high in the torque converter, not in the transmission. How will you measure that? Measuring the transmission temperature won't show anything useful.

Backing a load in soft sand will get the torque converter very hot very fast. And you may not have noticed that I said it will also heat up going forward at low speed. But at least there is some airflow, in reverse you need a headwind that is going faster than you're backing to get much air over the cooler. And yes, I know about the engine fan. At low engine speeds it isn't doing much at all. As the trans gets hot it doesn't engage the fan clutch until the engine gets hot. And that's usually too late for the transmission.