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10-14-2008, 07:49 AM
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#1
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Member
Workhorse Chassis Owner
Join Date: Jun 2007
Location: Nanaimo BC
Posts: 99
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We have a 2005 Itasca 29R and it only has a 4 speed transmission. At 55 M.P.H the motor is turning over 2000 R.P.M. How does this compare with the 5 and 6 speed transmissions? It is on a workhorse with an 8.1 engine.
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05 Itasca Sunova 29R
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10-14-2008, 07:49 AM
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#2
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Member
Workhorse Chassis Owner
Join Date: Jun 2007
Location: Nanaimo BC
Posts: 99
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We have a 2005 Itasca 29R and it only has a 4 speed transmission. At 55 M.P.H the motor is turning over 2000 R.P.M. How does this compare with the 5 and 6 speed transmissions? It is on a workhorse with an 8.1 engine.
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05 Itasca Sunova 29R
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10-14-2008, 08:03 AM
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#3
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Senior Member
Workhorse Chassis Owner Monaco Owners Club
Join Date: Nov 2005
Location: Portsmouth VA
Posts: 674
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At 55, my six speed UFO runs at 1800 RPM
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10-14-2008, 09:04 AM
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#4
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Senior Member
Workhorse Chassis Owner
Join Date: Jan 2007
Location: Roving, Datastorm users 3192
Posts: 756
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I have a five speed in my Intruder and IIRC as I was doing 60MPH it was more or less parked on 2KRpm. Unless I was going up hill.. And it downshifted then it went 3k, 4k and the speed dropped. then it returned to normal.
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Nothing adds excitement like something that is none of your business.
2005 Damon Intruder 377W Radio Active as WA8YXM
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10-14-2008, 10:18 AM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Posts: 1,902
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Tan, I would say that your RPM for 55 mph is just about right. Fourth gear in your GM transmission is an overdrive gear. My own 5 speed with fifth being overdrive turns 2000 RPM at 57 mph.
Dieselclacker
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Dieselclacker
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10-14-2008, 10:38 AM
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#6
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Senior Member
Join Date: Jul 2007
Location: SW Florida
Posts: 477
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Sounds about right. I'm at 1850rpm @ 51mph in 4th gear overdrive with the lesser powered 7.4 engine.
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1998 36ft. National Tropi-Cal...Model 6350 on a 1997 Chevy P32 Chassis...7.4 Vortec Engine...4L80E Tranny...one slideout and a tag axle.
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10-19-2008, 03:10 PM
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#7
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Junior Member
Join Date: Sep 2007
Location: Boston, MA
Posts: 8
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Keep in mind that a 4 speed (Hydramatic 4L80E) equipped chassis in most cases is also going to have a different rear end gear ratio versus a 5 or 6 speed Allison equipped chassis.
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10-21-2008, 04:47 PM
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#8
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Senior Member
Workhorse Chassis Owner Winnebago Owners Club
Join Date: Jan 2008
Location: Olympia, Wa and Las Vegas, Nv for the Winter
Posts: 1,075
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I'm turning right around 1800 more or less with my 6 speed .
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2008 Voyage 38J, W-24, Banks System, UltraPower, SteerSafe, Roadmaster All Terrain, US Gear Braking, Roadmaster AntiSway Bar
2011 Jeep Grand Cherokee Overland. US Army Ret
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10-21-2008, 05:22 PM
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#9
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Senior Member
Workhorse Chassis Owner Damon Owners Club
Join Date: May 2005
Location: Parker, CO
Posts: 2,679
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Max
'05 Damon Daybreak, 3270 on '04 P-32 Workhorse
Parker, Colorado
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10-21-2008, 05:25 PM
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#10
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Senior Member
Official iRV2 Sponsor
Join Date: Jun 2008
Location: Centralia, WA
Posts: 603
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geez max are you takin a picture, turnin a corner and runnin 80 MPH in that one picture?! LOL!
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Jon Brazel - Engine Performance Technician
Brazel's RV Performance Center & RV Park
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10-21-2008, 05:29 PM
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#11
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Senior Member
Workhorse Chassis Owner Damon Owners Club
Join Date: May 2005
Location: Parker, CO
Posts: 2,679
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No worries! I had it on cruise control auto pilot 
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Max
'05 Damon Daybreak, 3270 on '04 P-32 Workhorse
Parker, Colorado
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