Allison Transmission - Steel Soldiers::Military Vehicles Supersite

Barron · 11-27-2011, 20:53

Just got back from KS and spent some time with an ag operator that runs the same tranny as the 900 series trucks in big 3500 gallon spray rigs. He's running C4, and said he has 6400 hours of hard pulling on one of his 120 foot liquid sprayers without a hitch, just changes the fluid and filters every 12 months.

That's good news.

Westex · 11-27-2011, 21:53

I just pulled out the biggest mother of all palm tree stumps here in El Paso today with my 923 you can imagine. But that was today. Yesterday, 21,750 pounds of empty truck just hopped up and down on the street and we broke chains, straps, you name it. Bottom line: get the stump soaked, I mean SOAKED, before you pull it out. There are limits to every machine.

wsucougarx · 11-27-2011, 23:08

Hmm, you guys are certainly not helping me.....now I want a 923 even more

Barron · 11-27-2011, 23:22

I have like 53 big palms, maybe I should try that!,, Surely my wife wouldn't miss one

I did pull out a buried humvee the other day after some desert swamping after a rain, but that was pretty anticlimatic.

For all around driving, I sure like the 923. It's like driving a car compared to the older stuff.

Beerslayer · 11-27-2011, 23:41

I like the Allison in my 923 overall, but mine needs a little work. It leaks some fluid and the shift points are not consistent.

Here's a weird one. I thought the Allison in that truck was five speeds but here's what mine does.

When I put it into 1-2 it shifts up twice. Then I get another shift out of 1-3, 1-4, and 1-5. That sound right or is there something wrong with it?

jwaller · 11-27-2011, 23:43

Quote:

Originally Posted by Beerslayer

I like the Allison in my 923 overall, but mine needs a little work. It leaks some fluid and the shift points are not consistent.

Here's a weird one. I thought the Allison in that truck was five speeds but here's what mine does.

When I put it into 1-2 it shifts up twice. Then I get another shift out of 1-3, 1-4, and 1-5. That sound right or is there something wrong with it?

no it's fine. your feeling the torque converter locking up and thinking it's another gear.

Barron · 11-27-2011, 23:48

It could be the modulator on the left side of the trans. Mine shifts 1, 1/2, 1/2/3, 1/2/3/4 thru 1,2,3,4,5. The modulators stick sometimes if they've been sitting a long time.

Whenever I drive mine, I run it thru all gears, 1 thru 5 starting with 1st, just to work everything. The biggest problem with all of these trucks is sitting.

Beerslayer · 11-27-2011, 23:49

Quote:

Originally Posted by jwaller

no it's fine. your feeling the torque converter locking up and thinking it's another gear.

Let me explain further and see if you still thing that is the case.

If I start out in 1-2, the transmission shifts up at about 1700. Then accelerates further and 'seems to shift' again at about 1600. The other gears do not do that.

Are you suggesting that the torque converter is slipping up until that point?

Thanks for your comments.

BS

jwaller · 11-28-2011, 00:11

Quote:

Originally Posted by Beerslayer

Let me explain further and see if you still thing that is the case.

If I start out in 1-2, the transmission shifts up at about 1700. Then accelerates further and 'seems to shift' again at about 1600. The other gears do not do that.

Are you suggesting that the torque converter is slipping up until that point?

Thanks for your comments.

BS

yup, thats what torque converters do, they slip until locked up.

Stalwart · 11-28-2011, 00:46

Quote:

Originally Posted by jwaller

yup, thats what torque converters do, they slip until locked up.

Standard torque convertors always slip. Special locking convertors lock. Don't confuse stalling and locking, not the same thing.