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Old 10-06-2016, 11:41 AM   #121
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That chart is 35+ years old and somewhat outdated due to synthetic fluid and improved friction materials. I used to own a tranny shop and posted that chart as an upsale vehicle. Made a lot of money based upon that chart.
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Old 10-06-2016, 11:54 AM   #122
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From what I see, most people tend to neglect the transmission. They change their oil regularly and forget about the box. It needs changed too and the filter on a regular basis, especially if you tow something, external cooler or not.

I change my E4OD every spring, with a new filter too. I use Dexton Mercon because it's a '97 box.

Allisons especially need regular changes and filters and OEM Allison fluid too.
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Old 10-06-2016, 04:05 PM   #123
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Just returned from a trip to Rapid City SD then the mountains of New Mexico. Tranny ran 190 to 195 in my 2014 Tahoe with the heavy tow package pulling a 24.5 ft SolAire 20 RBS. Mostly flat with some hills. On one long, steep climb we got up to 205 but no higher. It normally runs at about 175 in the summer just going down the road. Running with a 5.3 liter V8, 6-speed auto and a 3.43 rear end. We were getting between 8 and 11 mpg, averaging about 9 mpg while towing. I made sure I washed the tranny cooler and A/C condenser to get rid of bug guts and road oils before we left. It definitely helped.
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Old 10-06-2016, 04:21 PM   #124
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Originally Posted by elchilero53 View Post
Just returned from a trip to Rapid City SD then the mountains of New Mexico. Tranny ran 190 to 195 in my 2014 Tahoe with the heavy tow package pulling a 24.5 ft SolAire 20 RBS. Mostly flat with some hills. On one long, steep climb we got up to 205 but no higher. It normally runs at about 175 in the summer just going down the road. Running with a 5.3 liter V8, 6-speed auto and a 3.43 rear end. We were getting between 8 and 11 mpg, averaging about 9 mpg while towing. I made sure I washed the tranny cooler and A/C condenser to get rid of bug guts and road oils before we left. It definitely helped.
That's about the exact same thing I get with a 2012 pulling almost 33'. My last one was almost the same size as yours and temps / mileage weren't much different there either. After you get them rolling, there's almost no difference in temps and mileage unless you're into some steep hills.
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Old 10-06-2016, 05:11 PM   #125
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She for my 2010 silverado with similar tow weights.
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Old 10-06-2016, 07:33 PM   #126
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My E4 in my 7.3 always runs around 195 no matter of I run empty or pull my 24 foot gooseneck overloaded with round bales.... I've put upwards of 20 grand on the deck. Way more than pulling any trailer of fiver.

I run 2 Hayden swirl cool transmission coolers.
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Old 10-07-2016, 07:41 AM   #127
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I may have a problem with my transmission, I thought my hitch was the reason I felt something that bumps when the transmission drops out of high like when I'm pulling the camper up at mountain. The same thing happened yesterday and I wasn't pulling anything, just passing a car.


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Old 10-07-2016, 07:51 AM   #128
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I may have a problem with my transmission, I thought my hitch was the reason I felt something that bumps when the transmission drops out of high like when I'm pulling the camper up at mountain. The same thing happened yesterday and I wasn't pulling anything, just passing a car.


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check your u-joints . as far as temps go with the external cooler i run 165 when towing and up tp 195 when pulling the ike gantlet when i'm not towing about 145 . iput in a cooler t-stat in the motor and that helps even more . can't say enough about adding good external coolers
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Old 10-07-2016, 07:56 AM   #129
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check your u-joints . as far as temps go with the external cooler i run 165 when towing and up tp 195 when pulling the ike gantlet when i'm not towing about 145 . iput in a cooler t-stat in the motor and that helps even more . can't say enough about adding good external coolers

Thanks. I'll do that


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Old 10-07-2016, 10:35 AM   #130
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I may have a problem with my transmission, I thought my hitch was the reason I felt something that bumps when the transmission drops out of high like when I'm pulling the camper up at mountain. The same thing happened yesterday and I wasn't pulling anything, just passing a car.


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Spock, what type/kind of rig you driving????
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