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Transmission down shift

Yahoo Message Number: 9578
How many of you folks have a trany that seems to downshift rather harshly going into 1st just prior to a stop? I haven't driven a bunch of CC but did test drive a few and they all seem rough. I understand the Allison 'learning' think and thought that was probably the problem. Well I have driven over a 1000 miles and still have a rough downshift. Does my trany have ADS or is it just a slow learner? Maybe it is ME! Thanks, Larry
'99 Affinity

Re: Transmission down shift

Reply #1 –
Yahoo Message Number: 9579
Mine occasionally "slams" and jerks when slowly decelerating to a stop.
Feels like you just hit a volkswagon. It, however only occurs with the PacBrake ON. I try to remember to turn off the PacBrake when in slow traffic such as stoplight to stoplight and have no problems.

Dave

2000 Allure 36'

#30444 Blt. Sept. 99
2004 Pilot Toad

tbeer45 wrote:

Re: Transmission down shift

Reply #2 –
Yahoo Message Number: 9581
Dave, your trany seem to be responding exactly like mine. Do you also notice a 'rumble' when shifting up from, maybe 3 to 4 or 4 to 5? I have had that since purchase as well, the dealer said everything was 'normal' of course. I have heard noises like the 'rumble' before in buses and always thought that the drive line was about to go.
Thanks for the reply, Larry
'99 Affinity

Quote from: Dave Hills\[br\
]
Mine occasionally "slams" and jerks when slowly decelerating to a

stop.

Quote
Feels like you just hit a volkswagon. It, however only occurs with

the

Quote
PacBrake ON. I try to remember to turn off the PacBrake when in

slow

Quote
traffic such as stoplight to stoplight and have no problems.

Dave

2000 Allure 36'

#30444 Blt. Sept. 99
2004 Pilot Toad

tbeer45 wrote:

>How many of you folks have a trany that seems to downshift rather > >harshly going into 1st just prior to a stop? > >I haven't driven a bunch of CC but did test drive a few and they

all

Quote
seem rough. I understand the Allison 'learning' think and thought > >that was probably the problem. Well I have driven over a 1000

miles

Re: Transmission down shift

Reply #3 –
Yahoo Message Number: 9582
Quote from: tbeer45
Dave, your trany seem to be responding exactly like mine. Do you

also

Quote
notice a 'rumble' when shifting up from, maybe 3 to 4 or 4 to 5? I > have had that since purchase as well, the dealer said everything > was 'normal' of course.
I have a "rumble" between 35 and 40 mph in normal operation until I let up on accelerator or get out of that speed range. I have assumed it is an out of balance drive shaft but otherwise the coach runs very smoothly.

I also have had the abrupt down shift to first gear, usually while slowing on an uphill grade. Just assumed it was an inexperienced driver. Not a frequent event.

Dean

95 Magna #5280

Re: Transmission down shift

Reply #4 –
Yahoo Message Number: 9583
Dean, thanks for the info seems I'm not alone in this.
Thanks again, Larry
'99 Affinity

Quote from: Dean
Quote from: tbeer45"[/quote
Quote
>]
> Dave, your trany seem to be responding exactly like mine. Do you > also

> notice a 'rumble' when shifting up from, maybe 3 to 4 or 4 to 5?

I

Re: Transmission down shift

Reply #5 –
Yahoo Message Number: 9594
Larry,

Not so much a "rumble", but more of a "hard" shift. Only happens under "light" acceleration. Never happens at full throttle from a dead stop.
I would guess this is due to some slight "slippage" of the transmission clutches during the shift at high torque and no slippage at low torque, producing a "lurch" from engine suddenly slowing down due to the gear change.
Dave

2000 Allure 36'

#30444 Blt. Sept. 99
2004 Pilot Toad

tbeer45 wrote:

Re: Transmission down shift

Reply #6 –
Yahoo Message Number: 9623
Dave, thanks for the reply. I was wanting to reply to your post on Yahoo but I have not been able to access it for days. It just says it is not available.
Are you having the same problem? I think Yahoo is still functioning because I get messages from others that have been posted there on my e-mail. AH Yahoo, be glad when this forum switches to the other site.
Larry

Re: Transmission down shift

Reply #7 –
Yahoo Message Number: 9624
I have not noticed any problems on this end.

Dave

Larry and Teddy Beer wrote:

Re: Transmission down shift

Reply #8 –
Yahoo Message Number: 9664
Have you all changed fluids and filters lately? Disconnect the chassis battery, and reprogram the tranny to your driving habits. TWI 98 Allure 30255 and 2004 Intrigue.

Re: Transmission down shift

Reply #9 –
Yahoo Message Number: 9665
I had the same problem with my 98 Allure, it was a bad wiring harness between the tranny and engine computer. TWI 30255 My new Intrgue is just fine

Re: Transmission down shift

Reply #10 –
Yahoo Message Number: 9697
-TWI, I had the tranny serviced [fluid and filter changed] less than 1000

miles ago.

Could you explain about your statement to disconnect the batt. and reprogram the tranny? Where do you find that procedure? Thanks, Larry

'99 Affinity

Re: Transmission down shift

Reply #11 –
Yahoo Message Number: 9704
As I remember the Allison manual states somewhere on the MD 3060, that if you lift the ground as directed in the cummins manual for storage, that the transmissions learning curve will start all over again. Then you must follow Allisons proceedure for teaching the transmission. After I got the harness repaired it worked. The new 3000 tranny is much better, but I think it is because it has the new ultra expensive long life tranny fluid in it. TWI 98 Allure 30255, Intrgue 2004 11731
 

Re: Transmission down shift

Reply #12 –
Yahoo Message Number: 9709
TWI, I have a CAT driving a HD 4060 tranny, I'll have to dig around in the manuals, haven't found anything so far that refers to a procedure you describe.
Thanks, Larry
'99 Affinity