RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Allison Transmission Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-20-2011, 08:46 AM   #1
Member
 
Join Date: Dec 2010
Location: Polk city Florida
Posts: 64
Allison transmission harsh downshift

Country Coach Allure 99: Has anyone experienced harsh downshift after changing to Transynd. Upshift and everything else fine.
__________________

luqutus is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 04-20-2011, 10:58 AM   #2
Senior Member
 
1ciderdog's Avatar


 
Join Date: Jun 2010
Posts: 4,422
Yes, I think it takes a while for the transmission to relearn shift patterns.
Bob
__________________

__________________
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 2015 RAM Limited 4X4
1ciderdog is offline   Reply With Quote
Old 04-28-2011, 08:55 PM   #3
Junior Member
 
Join Date: Sep 2010
Posts: 26
Happened to me too. I was down a little on fluid and they will downshift HARD. SHould get better
atomic98 is offline   Reply With Quote
Old 04-28-2011, 10:59 PM   #4
Senior Member
 
1ciderdog's Avatar


 
Join Date: Jun 2010
Posts: 4,422
Why not ask the Allison guy that is on this net?
__________________
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 2015 RAM Limited 4X4
1ciderdog is offline   Reply With Quote
Old 05-01-2011, 08:10 PM   #5
Senior Member
 
hzjcm8's Avatar
Commercial Member
 
Join Date: Apr 2011
Location: Avon, IN
Posts: 619
Send a message via AIM to hzjcm8 Send a message via MSN to hzjcm8 Send a message via Yahoo to hzjcm8
Quote:
Originally Posted by 1ciderdog View Post
Why not ask the Allison guy that is on this net?
I've not really heard of this happening but it is possible that the older fluid left a film on the clutch plates that led to reduced friction coefficient and slightly elongated shifts. Could be the new fluid dispersants are cleaning the surfaces and returning the surfaces to the original friction coefficient. This would raise the coefficient and make for harsh shifts until the TCM (Transmission Control Module) changes pressures to get the shift times back into calibration. Note: This is a theory but, if it's correct, the problem should get better soon as the TCM shift schedules "fine tunes" the shifts. It should converge shortly.

Hope this helps.

PS: It could also be air in the system if the fluid was low but I would expect all the shifts to be "soft" and not harsh. Also, I would think if it was air entrainment, upshifts and downshifts would be affected.
hzjcm8 is offline   Reply With Quote
Old 05-02-2011, 09:31 AM   #6
Member
 
Join Date: Dec 2010
Location: Polk city Florida
Posts: 64
Thanks for posts. Second day everything seemed fine. Looks like TCM needed time to do its job.
__________________

luqutus is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Allison transmission on kenworth truck C500 Haddadi Allison Transmission Forum 2 04-05-2011 08:32 PM
1991 Allison HT-747 Transmission service question...: fkloster Allison Transmission Forum 2 02-11-2011 11:00 AM
Allison Transmission Seminar DriVer Workhorse Chassis Motorhome Club (WCMC) 0 09-27-2010 09:23 AM
Allison Transmission Leak gMw Allison Transmission Forum 3 08-30-2009 06:42 PM
Allison Transmission Leaks Beethovin Winnebago Industries Owner's Forum 21 12-30-2008 02:03 PM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:16 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.