cowboywildbill
06-04-2003, 18:54
Hi everyone. I just put the deep allison pan on my truck. I also changed the internal filter(sump pickup). The deeper pan takes a deeper or should I say a longer sump filter & pickup assembly. I was surprised that the new sump was only an inch longer or deeper than stock. But the pan is only about 1-1/2 inches deeper in the front and about 3 inches deeper in the rear. So I guess it is the right one. I have done many trans fluid changes and the like, but I was surprised at how loose fitting the sump is when I pushed it back up into the valve body. I had to reach up and pull the old "o" ring out after removing the factory filter. So I know that that wasn't the problem. I gave it a pretty good push, smacked it to make sure that it was all the way up in the valve body. Has any one else changed one? It reminded me of the GM trans filters on some of the automotive products, not being as snug as I thought it should be. Anyway I had drained out 7-1/2 quarts including the spin on and drain off from dropping the pan down and internal filter. I added 12-1/2 quarts back. I did it slowly and kept checking it untill it was just bleow the hot mark on the stick also drove it some before I topped it off. It looks like the deeper pan holds about 5 more quarts of fluid than the stock shallow pan did. The allison dealer said tha GM had the shallow pan for added ground clearance in the pickup trucks. And that the deeper pan is really the intended pan for the 1000 series trans. I couldn't see any real difference in the clearence after adding the new pan. If I hit something even with the new pan, I shouldn't be going there in a dually any ways. It really doesn't hang any lower than stock from what I can tell. I have 29,000 miles on the truck and this is the second time I have changed fluid and spin on filter. First time was at 12,000 miles. I was amazed at how clean the old fluid was and that there wan't any debri in the pan or the magnet on the filter. That sure wasn't the case with our Dodge cummins automatic. But then I didn't have to change the fluid often on that, because it got a new trans every 15 or 20 thousand miles. Thank Goodness for that extended warranty. They replaced six units in 84,000 miles. The new deep pan only cost $50.00 and the new sump was $14.00. I also replaced the pan gasket$26.00. But I found out that the old gasket is reusable and I could have saved the $26 bucks. I will let you know if the trans temp runs cooler now when I tow. I will change to transyn or whatever the allison synthetic is called, next time I do a fluid change. The Transynd is $175.00 for five gallons. "OUCH" That is why I am waiting. Has anyone else done the deep pan and transynd change? Let me know. Also let me know about how your new sump fit into the valve body and was it only an inch or so longer. I thought this deep pan mod would help, and certainly shouldn't hurt. More fluid should means more cooling. Now if I could just find a better price on the transynd synthetic !
[ 06-04-2003, 07:07 PM: Message edited by: Cowboy Wild Bill ]
[ 06-04-2003, 07:07 PM: Message edited by: Cowboy Wild Bill ]