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Old 05-11-2022, 11:49 PM   #1
Mini-Skoolie
 
Join Date: Dec 2021
Location: On the road. Currently traveling thru Oklahoma
Posts: 18
Year: 2000
Coachwork: Amtran
Chassis: International
Engine: Dt466e
Exclamation stranded in the middle of nowhere, please help! Allison 5 speed in 2000 dt466e in neu

2 hours away from anything, I woke up the other morning, got fuel and drove about 2 blocks when my transmission shifted itself into neutral and had been stuck there since.

No signs of any transmission issues prior to this.

When it happened, no noises, no sudden jerking, very smooth shift to neutral.

Fluid and filter look new, fluid level is right where it should be.

Rear end checks out good.

Flywheel looks good.

Nothing seems damaged.

Found an exposed wire from a wire in the harness, fixed that.

Fuses all check out, unless I'm missing a fuse panel somewhere.

No stamp on transmission, Tshifter is r n d 3 2 1

International said it was a 545 but the other info they gave me during that same phone call was inaccurate. So, could be wrong.

Has a remanufactured sticker on transmission with barcode and reads, C5335

Tried transmission reset procedure, N-D-N-D-N-R-N, nothing.

Vin# 1HVBBAAP4YH304041

Please help if u can. I'm stranded in the middle of nowhere. I've called International, they won't come and help because they said it's Medium-Duty and to call Chevy. Chevy is clueless.

Local mechanics are stumped.

One that came out bright Nexus with International program. Couldn't link up to transmission.
Could be mechanical transmission.

Is there a work around?

I'm good with electric stuff.

I keep thinking it's a sensor or is in inhibit mode.
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Old 05-12-2022, 06:22 AM   #2
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Year: 1993
Coachwork: bluebird
Engine: 5.9 Cummins, Allison AT1545
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you can wait for the experts to weigh in but.....

imo, that looks like a 545. a mechanical 545. you have an electric modulator and parking brake that im not familiar with, but the rest looks like a 545.

do you have an electronic button pad gear shifter or a t handle selector? im guessing its the t handle one.

if its a 545 and not going into gear, the selector cable may have slipped. you can unhook the cable and move the tab thru its gear positions. you should have someone looking underneath and someone moving it inside to see the action of the cable and selector.

i've had to adjust mine after not being able to get into reverse.

the electric modulator should not affect you, i believe that comes into play when downshifting. keep the cable plugged in.

other than a cable problem, check that fluids are full.

maybe some expert will chime in and say what internally may be wrong. or if thats a different trans.
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Old 05-12-2022, 06:32 AM   #3
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i would take off the gear cable and check that the selector tab can move thru the gears.
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Old 05-12-2022, 08:42 AM   #4
Mini-Skoolie
 
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I can't help with the transmission, but since it's an Allison, could you call the closest Allison repair shop? They may be separate from the International and Chevy dealers.
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Old 05-12-2022, 10:07 AM   #5
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i would also check all your u joints.
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Old 05-12-2022, 11:36 AM   #6
Bus Nut
 
Join Date: May 2015
Location: Miami, Fl.
Posts: 886
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by !eslie.brewer.me View Post
2 hours away from anything, I woke up the other morning, got fuel and drove about 2 blocks when my transmission shifted itself into neutral and had been stuck there since.

No signs of any transmission issues prior to this.

When it happened, no noises, no sudden jerking, very smooth shift to neutral.

Fluid and filter look new, fluid level is right where it should be.

Rear end checks out good.

Flywheel looks good.

Nothing seems damaged.

Found an exposed wire from a wire in the harness, fixed that.

Fuses all check out, unless I'm missing a fuse panel somewhere.

No stamp on transmission, Tshifter is r n d 3 2 1

International said it was a 545 but the other info they gave me during that same phone call was inaccurate. So, could be wrong.

Has a remanufactured sticker on transmission with barcode and reads, C5335

Tried transmission reset procedure, N-D-N-D-N-R-N, nothing.

Vin# 1HVBBAAP4YH304041

Please help if u can. I'm stranded in the middle of nowhere. I've called International, they won't come and help because they said it's Medium-Duty and to call Chevy. Chevy is clueless.

Local mechanics are stumped.

One that came out bright Nexus with International program. Couldn't link up to transmission.
Could be mechanical transmission.

Is there a work around?

I'm good with electric stuff.

I keep thinking it's a sensor or is in inhibit mode.
I know nothing about the AT545 but what I can do is share with you the Allison AT545 service manual.

Hope it helps you out.

File to large to upload, 4mb & 190 pages, so here is the link

-> https://wanderlounge.net/wp-content/.../283760640.pdf
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Old 05-13-2022, 10:14 PM   #7
Mini-Skoolie
 
Join Date: Dec 2021
Location: On the road. Currently traveling thru Oklahoma
Posts: 18
Year: 2000
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Chassis: International
Engine: Dt466e
I really appreciate all the feedback!

I have t handle shifter.
Fluids are full and normal in color, no metal flakes.

Modulator seems to be seeping Trans Fluid at wire connection.

I found someone to shift while I'm down below, tomorrow. I will take off gear cable and check selector tab as well as u joints at that time.
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Old 05-13-2022, 10:22 PM   #8
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here is another manual that may help out.

http://www.waghornswood.net.nz/Manua...nsmissions.pdf

sections 3-4 and 5-8 explain the shifter connection.

the modulator leaking is no big deal, i forget if there is an o-ring behind it or not.
good luck
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Old 05-17-2022, 11:13 AM   #9
Mini-Skoolie
 
Join Date: Dec 2021
Location: On the road. Currently traveling thru Oklahoma
Posts: 18
Year: 2000
Coachwork: Amtran
Chassis: International
Engine: Dt466e
Thank you so very much!
I bypassed the modulator by direct wiring a momentary push button in.

Still nothing.

Digging into cable today.
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Old 05-17-2022, 01:16 PM   #10
Bus Nut
 
Join Date: May 2015
Location: Miami, Fl.
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Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by !eslie.brewer.me View Post
Thank you so very much!
I bypassed the modulator by direct wiring a momentary push button in.

Still nothing.

Digging into cable today.
I DON'T KNOW TRANSMISSIONS BUT CHECKING THE CABLE/SHIFTER IS QUITE EASY TO DO!

First, chock your drive wheels, both sides.
Second, get a helper....
Third, start bus up, foot always on the brake, shift into gear. If you do not feel it going into gear, you or the helper go under the bus and try moving the shifter manually on the transmission.

Does it go into gear - yes or no ?

If it does, the shifter needs adjustment. If it does not and it is an AT545 mechanical...call a tow truck !

My thoughts are that if the bus starts then at least the NSBU switch is dead set on neutral. But then there is always the possibility the NSBU is worn or will not align proper when shifting into gear.

Again, I'm not a mechanic but if I was stranded, this is what I would do to confirm.

You have yet to properly identify which trans you have.
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Old 05-17-2022, 03:54 PM   #11
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Join Date: May 2009
Location: Columbus Ohio
Posts: 16,557
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
thats a Deep pan AT545.. sounds like it failed in exactly the same way one of my AT545s failed.. just went to go from 3-4 and it went from 3 to N and never moved again...



any idea if Prior to your failure the reverse Lights and beeper worked?



reason i ask is the reverse lights are pressure driven on this transmission.. if the shift lever is working properly and the pump is making pressure, when you go into 'R' with the engine running the reverse lights shopuld come on and beeper bleep..



if you dont get that then either shift linkage is misadjusted or front pump pressure is not present.



this a poor mans test you can do.. but it is contingent on you knowing if your reverse lights worked prior to the failure..





when mine failed, the front bearings went and wiped out my Pump so it made no pressure...



a broken modulator can cause failure of this transmission however it will not matter what position the modulator is in to determine forward or reverse movement.. in other words if it isnt moving forward or backward on its own power, the modulator is not the issue..



low fluid could be the issue.. be sure to check it wit hthe engine RUNNING and the shifter in 'N' and parking brake set.. if its cold you should be at the full cold line.. if not then add some..


if the fluid level doesnt change from engine off to engine running, thats another sign that the pump is not building pressure..
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Old 05-17-2022, 03:56 PM   #12
Bus Geek
 
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Location: Columbus Ohio
Posts: 16,557
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Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
Quote:
Originally Posted by ewo1 View Post
I DON'T KNOW TRANSMISSIONS BUT CHECKING THE CABLE/SHIFTER IS QUITE EASY TO DO!

First, chock your drive wheels, both sides.
Second, get a helper....
Third, start bus up, foot always on the brake, shift into gear. If you do not feel it going into gear, you or the helper go under the bus and try moving the shifter manually on the transmission.

Does it go into gear - yes or no ?

If it does, the shifter needs adjustment. If it does not and it is an AT545 mechanical...call a tow truck !

My thoughts are that if the bus starts then at least the NSBU switch is dead set on neutral. But then there is always the possibility the NSBU is worn or will not align proper when shifting into gear.

Again, I'm not a mechanic but if I was stranded, this is what I would do to confirm.

You have yet to properly identify which trans you have.

this trans doesnt have an NSBU switch.. the NS is linked to the shifter inside the trans.. so if you shift to 'N' and the bus starts then its aligned.



if you shift to 'R' and the bus still starts then you likely have a shifter alignment issue with the cable.. but if the bus doesnt start then you know you are not in 'N'..



the 'BU' is a pressure switch inside the trans... when you reach reverse. valve body pressure is applied to the BU switch as well as the Reverse clutch.
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Old Yesterday, 07:00 AM   #13
Bus Nut
 
Join Date: Sep 2020
Location: Central PA
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Engine: T444E
Rated Cap: 78
Christopher to the rescue!
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Old Yesterday, 07:54 AM   #14
Bus Nut
 
Join Date: May 2015
Location: Miami, Fl.
Posts: 886
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by cadillackid View Post
this trans doesnt have an NSBU switch.. the NS is linked to the shifter inside the trans.. so if you shift to 'N' and the bus starts then its aligned.



if you shift to 'R' and the bus still starts then you likely have a shifter alignment issue with the cable.. but if the bus doesnt start then you know you are not in 'N'..



the 'BU' is a pressure switch inside the trans... when you reach reverse. valve body pressure is applied to the BU switch as well as the Reverse clutch.
I just learned something new, Thanks !
I like that Bu switch tip!
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