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5 to 6 Speed Allison Conversion
02-22-2011, 02:54 PM
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#1
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Senior Member
Official iRV2 Sponsor
Join Date: Jun 2008
Location: Centralia, WA
Posts: 603
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Hey guys I need some input!
We are currently in the process of developing a conversion of the Allison 5 speed transmission to 6 speed just like the newer 06+ W-series. Because of the huge costs involved in doing something like this and before we ramp up production and get this thing going I need to know how much interest there is in a product like this. Based off of our projections the cost of such an upgrade will be in the $2000 range and include our GradeBrake if not already equipped. Any input would be greatly appreciated, and please keep the pricing bashing to a minimum, as the price reflects numerous components that must be changed. Just a simple yes or no and thoughts would be appreciated!
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Jon Brazel - Engine Performance Technician
Brazel's RV Performance Center & RV Park
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02-22-2011, 03:04 PM
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#2
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Community Moderator
Nor'easters Club Newmar Owners Club Workhorse Chassis Owner
Join Date: Oct 2004
Location: Salisbury,Ma. 01952
Posts: 13,617
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Yes, if only you were on the east coast. Wouldn't trust anyone else for that project. 
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02-22-2011, 03:14 PM
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#3
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Junior Member
Join Date: Dec 2010
Posts: 3
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yes of course!
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02-22-2011, 03:27 PM
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#4
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Member
National RV Owners Club Workhorse Chassis Owner
Join Date: Apr 2009
Posts: 60
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Yes, sounds very interesting.
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2005 Sea Breeze LX 8321
W22 Workhorse
2001 Jeep Cherokee
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02-22-2011, 03:54 PM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Apr 2005
Location: CA
Posts: 323
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It does sound interesting. Would we need to re gear the rear?
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04 Winnebago Adventurer 38R
Workhorse W22
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02-22-2011, 04:00 PM
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#6
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Senior Member
Official iRV2 Sponsor
Join Date: Jun 2008
Location: Centralia, WA
Posts: 603
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No regear necessary if we tune the Allison TCM correctly, we need to put more time on our beta test coach but it's looking good so far!
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Jon Brazel - Engine Performance Technician
Brazel's RV Performance Center & RV Park
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02-22-2011, 04:05 PM
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#7
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Senior Member
Fleetwood Owners Club
Join Date: Sep 2010
Posts: 272
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What model transmission would this include? Also can you explain more about the grade brake!
Thanks
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02-22-2011, 04:46 PM
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#8
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Senior Member
Workhorse Chassis Owner
Join Date: Oct 2007
Location: South Jersey
Posts: 866
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Jon, good offer. My question is would any later repair repair be able to be done at an Allison servicecenter or would it have to come back to you?
George
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Kathy & George Zimm & 2 Shelties, Merlin & Lancelot
Mickleton, NJ
2006 Coachman Epic & 2011 Chevy Equinox Toad
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02-22-2011, 05:16 PM
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#9
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Senior Member
Official iRV2 Sponsor
Join Date: Jun 2008
Location: Centralia, WA
Posts: 603
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It will be able to be serviced and diagnosed at any Allison repair facility as we are using all Allison parts.
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Jon Brazel - Engine Performance Technician
Brazel's RV Performance Center & RV Park
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02-22-2011, 05:19 PM
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#10
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Junior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Jul 2009
Posts: 4
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I would also be interested in the conversion.
George
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02-22-2011, 05:33 PM
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#11
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Senior Member
Workhorse Chassis Owner
Join Date: May 2005
Posts: 323
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I would really be interested also. Would this conversion close the gear ratio gap between 2nd and 3rd gear?
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Fred Kennerson
2003 Dolphin L/X 6320
Yucaipa, Ca
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02-22-2011, 07:15 PM
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#12
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 993
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I would not buy that upgrade.
Mine works fine as is and I travel all around the U.S. and live in California. I'm at 56,000 miles and the transmission works great.
The grade brake feature on mine is called pull the transmission lever down a notch. Seems to work fine that way.
I think you are smart doing some market research on here and you may want to post on RV.net also.
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2004 Monaco La Palma 36DBD, W22, 8.1
7.1 MPG based on fuel used over 60,000 miles
2000 LEXUS RX300 FWD 22MPG 4020 LBS
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02-22-2011, 09:02 PM
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#13
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Senior Member
Workhorse Chassis Owner
Join Date: Dec 2009
Posts: 150
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Jon; What is the RPM difference of 6th gear compared to 5th gear? I have read on one post that on a w-24 chassis the difference was only about 50 rpm. That is not much if so. Is your reprogram a different gear ratio? I would think a ratio that would give a greater drop in rpm would provide a better improvement on mpg. Thanks JP
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Just the Wife, Me and the Two Dogs!!
2006 Georgie Boy Luxura on a W-24 Chassis
Mods Include Full Banks System & Ultra-Power 
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02-22-2011, 09:29 PM
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#14
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Senior Member
Join Date: Jan 2011
Location: NY & FL
Posts: 838
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What would you consider the advantage of the 6th gear conversion? Lower rpms at cruise? slightly better mileage?
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2008 Itasca Meridian 37H
2011 & 2012 Len & Pat's "One lap of America"
14K miles so far - Woo Woo! 
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