1. Make sure you have enough fluid to dump-refill...drive around the block.. dump again - refill. This will swap out about 90% of the fluid.

2. I always toss a extra magnet or two in the pan. The spin on filter magnets work excellent!

 

Be sure to buy a filter locking bracket to prevent the filter from falling off or caveating if it get loose.

cinno

 

I didn't pick that option when ordering, figured if I didn't already have one then it must not be much of an issue.

Why is it needed?

 

If you use the correct “deep pan” filter you don’t need a filter lock. The pan will hold it in. The Allison deep pan is OE on the bigger trucks.

 

If your dropping the pan, there’s absolutely no need to do the double drain and no need to worry about the 90%, you’ll get out more than enough fluid.
Get you truck higher in the front than the rear then allow Mother Nature to do the rest after you remove the drain plug, then the stock pan.
This allows for more fluid to drain down out of the lines, trans cooler & converter into the pan area.

 

No, double drain is the best way to go.

 

Sure, if your just draining out fluid from the drain plug, maybe.
When removing the pan, it’s unnecessary and just a waist of time and $$$$ for fluid.

My first drain after a moron so called Allison shop did my trans go jr and deep pan pun in Dex III.
It took 13 1/2 quarts to re-fill on a normal 9 1/2 qt fill with adding the deep pan.
With DexIII the trans temps went up and TCC slip increased.

I did the double drain and fill, my second fill I put the front on 6” blocks, let the truck set for 1 1/2 days then drained.
13 1/2 qts measured out from what a normal service would be 9 1/2 qts.

Recently I changed the 3 transmission lines dropped the deep pan to inspect and put on a new inner filter along with a new spin-on.
It took 15 qts to bring the level up to normal, for a 9 1/2 qt system, and yes I know about the hash marks on the dipper stick.
And my truck was only on the rack for about 3 hours.

So in reality when the front of the vehicle is higher than the rear and you pull the pan even just draining from the drain plug, you’ll get plenty of fluid out, it’s a waist of time and $$$ doing the double.
Trust me, I’ve done this many times since the double drain idea came out.
I always measure what comes out, so I know how much to put back in.

If the guy wants to take your advice and has a extra $150 - $200 for Transynd for the double burning a hole in his pocket, sure he can do what he wants.

 

I probably didn’t have to wait 2 days, but I did and I can, because I have multiple vehicles to drive.

Like I mentioned on my last service dropping the pan and lines I gots 15 quarts out and put 15 back in during a 3 hour service time frame.
In my manual it states to change the spin-on every 10K which I do and can easily afford to do.

For a know it all on this forum your always asking for lame advice on another forum.
You don’t know as much as you claim you do on this forum.

As far as your old fart smart a$$ mouth remark, read my lips “Good Buddy” you should know what that means in truck driver cowboy talk, now get started on it, I’m waiting.

Remember you pulled the smarta$$ gun and fired first, I’m just cleaning up after your mouth.:2ar15smilie[1]:

 

More than 20qts total system.

15qts and 2-days....you're still short.

I don't see the need to drain/dump twice in one episode, might as well drive it 20k after 2 fresh gallons, and change it again.
Then, you'd be good for the next 100k (TES-295).

 

Be sure the internal filter seal comes off when you remove the filter- and use the new seal on the filter- Not good to have two seals on it-

 

The last was 15 qts over a 3 hour period of draining with only 40 k on the Transynd fluid from the last service dropping the stock pan doing the TransGo and going deep pan.
I did a full service dropping the pan with new filters while changing the 3 lines during that 3 hours, just because I can and wanted to.

Let’s calculate this 20qt system 15qt measured and drained out, that comes to 75%, that’s pretty good for just one drain.

 

So after reading about a few issues with the deep pan internal filter falling off I decided to hold off a day and order the brace that holds it in, not sure if it's needed but I don't want to have to worry about it every time my trans acts any different.

I'm just draining, dropping the pan and old internal filter as well as the screw on and then installing the new stuff with with just the one time transync.

I change my trans fluid every year with new fluid just before camper towing season so the current fluid only has about 11,000, overkill maybe but I'm retired and don't mind doing it. Doing it twice back to back is a little too much for me.

Thanks for all the help and I'll be sure to check that the internal filter gasket comes off when I remove it.

 

With the actual Allison Deep pan and the actual Allison internal filter for the deep pan, there really shouldn’t be a issue.
I haven’t had any problems.

But I guess better safe with the brace than be worried about it.

Good luck and enjoy your camper season.