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Old 06-07-2016, 02:26 PM   #1
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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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Old 06-07-2016, 03:16 PM   #2
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You get to 6th gear between light? If so go ahead and use it!
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Old 06-07-2016, 03:21 PM   #3
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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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Old 06-07-2016, 03:27 PM   #4
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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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Old 06-07-2016, 03:39 PM   #5
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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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Old 06-07-2016, 04:32 PM   #6
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Quote:
Originally Posted by 96 Wideglide View Post
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.
mine gets down to under 1000 rpms at 45...do you have a 34'r?
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Old 06-07-2016, 04:38 PM   #7
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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 Rear radiator / CAC cleaning , I know his is a rear radiator, but the side radiator's get just as dirty.....
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Old 06-07-2016, 06:22 PM   #8
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Quote:
Originally Posted by LVRVLUVR View Post
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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Old 06-07-2016, 06:34 PM   #9
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Quote:
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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 Rear radiator / CAC cleaning , I know his is a rear radiator, but the side radiator's get just as dirty.....
I never get over 200, I was talking about making the a/c blow colder
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Old 06-07-2016, 06:39 PM   #10
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Originally Posted by 96 Wideglide View Post
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.
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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Old 06-07-2016, 06:54 PM   #11
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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
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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Old 06-07-2016, 06:55 PM   #12
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Quote:
Originally Posted by LVRVLUVR View Post
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.
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Old 06-07-2016, 06:56 PM   #13
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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 ??
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Old 06-07-2016, 06:59 PM   #14
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Allison is a smart transmission. I put it in "D" and let it do it's thing!
I guess that's why they call it an Automatic Transmission.
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