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06-07-2016, 02:26 PM
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#1
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Driving a DP in the city...
when in city traffic and driving light to light. what gear do you use...
I use 4th it runs the fan faster and in the heat of vegas, keeps the motor cool
it never goes over 1500 rpms...
some say leave it in 6th... but to me it seems to stop easier and quicker if in 4th...
what say you ?? 
oh, and I did the same with my 6speed gas motor...
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06-07-2016, 03:16 PM
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#2
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Oct 2009
Location: E WA or S TX
Posts: 4,057
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You get to 6th gear between light? If so go ahead and use it!
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04 Horizon QD, 12 Ford Flex, Excalibar, Brakemaster, Winter Texan, RVin! since 1974
Norm, Donna & Tinker Kat(RIP) 01 Z3
Life is a Timed Event, you only get One Go Around!
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06-07-2016, 03:21 PM
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#3
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,746
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Exactly.
It's never going to get to sixth gear in city traffic. I have the same ISL and tranny. I need to get up to about 60 mph before it will shift into 6th.
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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06-07-2016, 03:27 PM
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#4
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Senior Member
Vintage RV Owners Club Spartan Chassis
Join Date: Aug 2000
Location: Cedar Park, Tx.
Posts: 449
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I leave it in 4th so when the jake kicks in it doesn't have to downshift to be effective.
Yes, I use it in the city.
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1995 BlueBird BMC 37
2013 Jeep Wrangler Rubicon Unlimited
1984 BlueBird Wanderlodge FC35RB-Sold
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06-07-2016, 03:39 PM
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#5
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,768
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I let the Allison decide what gear it wants to use. Which ever it chooses is fine with me. 
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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06-07-2016, 04:32 PM
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#6
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by 96 Wideglide
Exactly.
It's never going to get to sixth gear in city traffic. I have the same ISL and tranny. I need to get up to about 60 mph before it will shift into 6th.
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mine gets down to under 1000 rpms at 45...do you have a 34'r?
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06-07-2016, 04:38 PM
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#7
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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Even in hot/city driving, the engine is not working........very hard.
If you are heating up, you might want to take a look at the condition of the radiator and the charge air cooler.............might need a good cleaning. Heating up due to low air flow from being dirty.........?
Look up "Dirty Radiator" and read through them, the only way to properly clean the radiator and the charge air cooler, is to pull them. After several good cleanings........I pulled mine.......shocked at what they looked like inside, between them.......where one can not clean without taking them apart........
Look at post #4 here http://www.irv2.com/forums/f26/rear-...ng-163541.html , I know his is a rear radiator, but the side radiator's get just as dirty.....
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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06-07-2016, 06:22 PM
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#8
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Senior Member
Monaco Owners Club
Join Date: Mar 2014
Posts: 916
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Quote:
Originally Posted by LVRVLUVR
when in city traffic and driving light to light. what gear do you use...
I use 4th it runs the fan faster and in the heat of vegas, keeps the motor cool
it never goes over 1500 rpms...
some say leave it in 6th... but to me it seems to stop easier and quicker if in 4th...
what say you ??
oh, and I did the same with my 6speed gas motor... |
Allison is a smart transmission. I put it in "D" and let it do it's thing!
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Jerry, "EWC (SW)" USN Retired
2003 Beaver Patriot Thunder 505 HP C-12 1550 TQ
Allison 4000MH Ram 4X4 towed
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06-07-2016, 06:34 PM
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#9
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by palehorse89
Even in hot/city driving, the engine is not working........very hard.
If you are heating up, you might want to take a look at the condition of the radiator and the charge air cooler.............might need a good cleaning. Heating up due to low air flow from being dirty.........?
Look up "Dirty Radiator" and read through them, the only way to properly clean the radiator and the charge air cooler, is to pull them. After several good cleanings........I pulled mine.......shocked at what they looked like inside, between them.......where one can not clean without taking them apart........
Look at post #4 here http://www.irv2.com/forums/f26/rear-...ng-163541.html , I know his is a rear radiator, but the side radiator's get just as dirty.....
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I never get over 200, I was talking about making the a/c blow colder
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06-07-2016, 06:39 PM
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#10
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by 96 Wideglide
Exactly.
It's never going to get to sixth gear in city traffic. I have the same ISL and tranny. I need to get up to about 60 mph before it will shift into 6th.
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so at 55 down the freeway.. or 50 you can't use 6th...I don't think I would like that much
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06-07-2016, 06:54 PM
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#11
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Senior Member
Official iRV2 Sponsor
Join Date: May 2011
Posts: 8,305
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Quote:
Originally Posted by LVRVLUVR
so at 55 down the freeway.. or 50 you can't use 6th...I don't think I would like that much |
My CAT C-12 and Allison 4060 shift into 6th at ~63mph. What's wrong with that? I can do 65 in 4th which is great in rolling countryside since I can keep the Jake Brake on without it shifting when the brake is applied.
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Joel (AKA docj)--
RV Technology Specialist
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06-07-2016, 06:55 PM
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#12
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,746
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Quote:
Originally Posted by LVRVLUVR
so at 55 down the freeway.. or 50 you can't use 6th...I don't think I would like that much |
Nope! Usually need to hit 60 to get tranny to upshift. I can then back off to about 58 and it will hold 6th, but any hill at that speed, it will quickly drop back to 5th.
May be different with yours, as your tranny may be programed differently, and you may have a different final drive gear ratio.
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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06-07-2016, 06:56 PM
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#13
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Senior Member
Monaco Owners Club Forest River Owners Club
Join Date: Jul 2012
Posts: 3,329
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I doubt it's much problem putting it in 4 it'll rev higher and not go to 5 or 6 so your wasting fuel . Since you're burning fuel anyway just start the gen and run the house air .. I do that on any hot day anyway. I let the Allison do its thing. One other thought is the chassis ac should be working fine at idle .. Perhaps it needs a charge or service ??
__________________
2023 Coachmen Encore 325SS
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06-07-2016, 06:59 PM
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#14
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by gemert
Allison is a smart transmission. I put it in "D" and let it do it's thing!
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I guess that's why they call it an Automatic Transmission.
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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