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Topic: 5 speed 2007 Seneca. Any easy way to covert to 6 speed? (Read 798 times) previous topic - next topic
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5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Yahoo Message Number: 4207
I have the Jayco Seneca 34ss with 5 speed. My understanding is that this trans, the MH1000 is the same as 6 speed but programming is different. Is there a way to get this to work well as a 6 speed?

Thanks!

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #1 –
Yahoo Message Number: 4208
I asked the same question over at the Diesel Place. If you have a late model 2006 of a certain S/Ns it can be reprogramed to allow the 6th speed to operate. The earlier transmissions cannot be done. Has to do with the way that the electronics talk to each other. The earlier trans can be upgraded with a kit from ATS or any of the upfitters that upgrade these transmissions to handle more torque and horsepower. What year is your SS?
Denny

From: fredzust
To: KodiakChassisClassC@yahoogroups.com
Sent: Sun, April 4, 2010 11:52:56 PM
Subject: [KodiakChassisClassC] 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

I have the Jayco Seneca 34ss with 5 speed. My understanding is that this trans, the MH1000 is the same as 6 speed but programming is different. Is there a way to get this to work well as a 6 speed?

Thanks!

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #2 –
Yahoo Message Number: 4209
Here is a thread on the 5-6 speed convert. Six Speed Allisonhttp://autos.groups.yahoo.com/group/KodiakChassisClassC/message/3339 . Some of the discussion will take you to Diesel Place. Not sure what the outcome was with being able to get a program change. As you will see in the thread some 07 Kodiak's had the 5 speed with a rear ratio that should be in a 6 speed. Not good. RPMs will be 2000 at 55 mph.
Best
Ron Hall

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #3 –
Yahoo Message Number: 4210
I have a 2007 on a 2006 chassis. At 70mph, I am turning 2300rpm now in 5th.

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #4 –
Yahoo Message Number: 4211
Doing a quick calculation shows that you probably have a 4.44 rear axle if you are doing 70 mph at 2300 rpm.
Have you got a VIN check on your Kodiak chassis?
Best
Ron Hall

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #5 –
Yahoo Message Number: 4212
Just got the VIN check looks like 4.78

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #6 –
Yahoo Message Number: 4213
Maybe I am lysdexic :) Perhaps it was 3200rpm, but I don't think so. IF converting to 6 speed is painful, perhaps just going to a taller rear gear makes more sense?

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #7 –
Yahoo Message Number: 4214
Using my calculations from my post. 2500 rpm would be just over 70 mph. You may want to talk to a Allison service center. You will need the serial # off the trans. There are also people on Diesel Place that may help. One is mikel.
Best
Ron Hall

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #8 –
Yahoo Message Number: 4218
Are you guys saying that there is a physical 6th gear in these trannys that is not used?
 

Re: 5 speed 2007 Seneca. Any easy way to covert to 6 speed?

Reply #9 –
Yahoo Message Number: 4219
From mid 2006 MH1000 transmissions have six speeds in them. At the Diesel Place site linked in tread above you will find the serial # cutoff for the 5 and six speed trans. Getting a program to make the sixth gear work seems to be the problem.
Best
Ron Hall