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Djhnsn
Member
Member # 8674
Reged: 09/30/00
Posts: 89
Loc: Clearwater, Fl
Allison AT-545 shift adjustment?
#1244115 - 06/05/03 12:05 AM

I have a 1996 IHC 4700 with a 444E and it shifts way too soft. I got 300K out of the first tranny before the converter blew up this factory rebuild has about 70K on it.

Is there any way to make the shifts firmer? I can't tell when it shifts from 1-2 or 2-3 only 3-4 due to the larger rpm drop. I swear the shifts are softer every time I drive it.

I do service it as needed with Allison fluid and filter. The fluid always comes out clean any ideas?

Dave

Gone Fishen
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Member # 1001
Reged: 04/28/99
Posts: 1930
Loc: Lost Wages, Nevada
Re: Allison AT-545 shift adjustment? new
#1245921 - 06/06/03 02:11 AM

From what little I know the non electronic allison is not programmable for shift settings. Get underneath and make sure that the linkage is smooth in the shifting hole and not binding. You have complained about the opposite that most operaters have. Most everyone complains about the harsh shift. If I see one of the trans. guys tomorrow, I will ask for you.

BigDaddyT
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Member # 30170
Reged: 03/05/03
Posts: 2442
Loc: Eagle River,Alaska
Re: Allison AT-545 shift adjustment? new
#1246860 - 06/06/03 06:52 PM

I have rode in a truck with the 4 speed allison and it jumps into gear like it has a shift kit. Very harsh but im sure it makes it last longer by eliminating the hang time while its between gears.

supermechanic
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Member # 20903
Reged: 04/04/02
Posts: 238
Loc: Pocono Mountains in beautiful eastern Pennsylvania
Re: Allison AT-545 shift adjustment? new
#1246900 - 06/06/03 07:25 PM

What oil are you using?
I had some shift softness when using regular red ATF, when I changed to 15-40 motor oil it stiffened up some.
Allison recomends 15 -40 for severe usage. Just don't put the pedal down hard if the tranny isn't warmed up(150 degrees or so)

Djhnsn
Member
Member # 8674
Reged: 09/30/00
Posts: 89
Loc: Clearwater, Fl
Re: Allison AT-545 shift adjustment? new
#1247229 - 06/06/03 11:22 PM

Quote:

What oil are you using?
I had some shift softness when using regular red ATF, when I changed to 15-40 motor oil it stiffened up some.
Allison recomends 15 -40 for severe usage. Just don't put the pedal down hard if the tranny isn't warmed up(150 degrees or so)




I am using 15-40. It started on atf then at the 5k service it went to 15-40. The 15-40 gets changed every oil change which is about 6k or 7k miles. I know I service more than they say I need to but it's not unusal for the converter out temps to be in the 210 to 220 range. The return temps range from about 175 to 195 or so depending on the water temp.

This is in a roll back tow truck and 90% percent of the time its at it's full 26,000lbs gvw. I am the only person who drives it so I know it's not abused. I put over 300K on the first tranny and this one shifts at the same points at the same time just alot softer. The modulator is electric and was new when the tranny was done.


Dave


rwoody
Member
Member # 3265
Reged: 10/10/99
Posts: 1180
Loc: park hill, ok usa/us army who knows where tomorrow or today?
Re: Allison AT-545 shift adjustment? new
#1247350 - 06/07/03 12:52 AM

did you get a new converter when built?


sounds like the converter is misspeced

it needs tightened up

my 643 is a stif shifter shifter
in low range in the rear but when you shift it to high
it is just right to me

195 converter out at my max loads so far at 52.000

dave1957
Member
Member # 19527
Reged: 02/02/02
Posts: 525
Re: Allison AT-545 shift adjustment? new
#1247504 - 06/07/03 05:12 AM

Dave,
There is a TSI or AFC out on shifting problems with the 545 and electronic engine. While it is not an electronic trans. It does have a
electronic data line (EDL) output from the ecm which controls a Trans modulator control relay which in turn controls a trans modulator shift solenoid. The engine ecm varies the shift according to eng load. The trans relay is located on the firewall, on a metal plate that covers the IDM. The bulletin from international gives part numbers for a kit. The fix is basically to install a switch to the throttle pedal. The switch is then wired into the modulator relay and adjusted to turn on and off at a given throttle percent. I can't say that you don't have other problems but thought I would let you know about this bulletin. I will see if I can find a copy monday.

Gone Fishen
Member
Member # 1001
Reged: 04/28/99
Posts: 1930
Loc: Lost Wages, Nevada
Re: Allison AT-545 shift adjustment? new
#1249503 - 06/08/03 08:13 PM

Allison does NOT recommend 15-40 in the smaller transmissions. Larger ones for city busses or simular. Use atf or the new "Transend" synthetic from Allison. The shift points can be changed but that will change the rpm to which the transmission shifts. If you do not want to use the genuine Allison oil, I will get the manufacturer on the label so you can get their stuff which is the same oil. You are useing to heavy of oil for your application.

supermechanic
Member
Member # 20903
Reged: 04/04/02
Posts: 238
Loc: Pocono Mountains in beautiful eastern Pennsylvania
Re: Allison AT-545 shift adjustment? new
#1249722 - 06/08/03 10:00 PM

Owner's manuel that came with my trans specs 15-40.

Djhnsn
Member
Member # 8674
Reged: 09/30/00
Posts: 89
Loc: Clearwater, Fl
Re: Allison AT-545 shift adjustment? new
#1249985 - 06/09/03 12:02 AM

Yes the converter is new that was the reason for the tranny change. I dont remember what the multiplier is off the top of my head but I matched it to the orignal.

I actually talked to someone at Allison who told me to use 15-40 to try to tighnten it up some. The only thing I did notice about changing to 15-40 is the converter seems a tad tighter at highway speeds.


Dave



Gone Fishen
Member
Member # 1001
Reged: 04/28/99
Posts: 1930
Loc: Lost Wages, Nevada
Re: Allison AT-545 shift adjustment? new
#1251649 - 06/10/03 12:13 AM

I am to be corrected, apparently some few years back they actually did allow the use of 15-40 oil. I personally think it is to much on the smaller transmissions. I have not seen it used either as why I questioned it. I did ask the transmission team. If it works and gives you good life on the transmission, go for it.

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