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Old 07-21-2014, 05:47 PM
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Towing-Help?

Hey Guys,

Multiple questions, but first, some backstory.

We have had several travel trailers in the past, but just recently bought our first toy hauler(bumper pull). We just(last night) got back from out first trip to the dunes, and have some questions. Truck specs in my signature.

Truck+trailer weigh in at 20K Combined(weighed in last night, this is everything full, and 5 adults in the truck, max load). When pulling mountains(we live in california, so there are a lot of mountains between us and coos bay), we cannot cross about 42MPH. Is this normal with a heavy load? Next, when we got stopped in traffic and were doing about 4mph up a hill in a construction zone we got our trannie well into the yellow on the factory gauge. Is this normal? And, we ran essentially the entire trip with no AC to keep the truck cool(when we turn on the AC the truck would get hot!), how do we fix this?

New Trannie pan with fins?
Change out the 3.73 rear end for 4.10?
Drop in a HD4R100 trannie as an upgrade?
Sell the F250 for an F350 Dually of the same year?
Something else?

Looking for comments, suggestions, etc.
Towing-Help?-10487320_10202474901890184_6553347142672195370_n.jpg
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Old 07-21-2014, 06:06 PM
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You have a factory Trans gauge???

Upgrade your Trans cooler, look into a heavy tow/tow tune, yes 20k is heavy, but only difference a Dually will make is going to be sway and stability at speeds IMHO, 4.10's are great for getting a load moving, but if you don't tow often then you may as well keep the 3.73's

Good Trans coolers are the 6.0 cooler, and the true cool 40k coolers are most popular,
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Old 07-21-2014, 06:10 PM
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Quote:
Originally Posted by 351fifty View Post
You have a factory Trans gauge???

Upgrade your Trans cooler, look into a heavy tow/tow tune, yes 20k is heavy, but only difference a Dually will make is going to be sway and stability at speeds IMHO, 4.10's are great for getting a load moving, but if you don't tow often then you may as well keep the 3.73's

Good Trans coolers are the 6.0 cooler, and the true cool 40k coolers are most popular,
Yep, we have the factory trans gauge, but the hyperpac also gives me real numbers, so i know for a fact that climbing the construction hill we were at 250F straight up, would have pulled over and stopped if at all possible, but unfortunately it is a single lane with hard barriers on each side.

Heavy Tow/Tow tune, so you suggest like a DP Custom tune? The hyperpac has simply 3 stages, We leave it in stage 1.
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Old 07-21-2014, 06:19 PM
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DP, PHP, Powerstruck, Gearhead, Tony Wildman, etc. You are turning OD off (light on) correct?
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Old 07-21-2014, 06:20 PM
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More info:
This is auto tranny.

Outside temp ~100 degrees F for the whole trip. FIRST HILL OF THE TRIP- Hill was 8% grade, 5 miles up. Truck never drops below 42MPH, 2nd gear. Engine temp reached >250 F, Tranny never exceeded 220F. On Last real hill, grade ~7%, BUT we had to slow to 1st gear and come to a complete stop, then re-start moving up grade. Could never get fast enough to shift to second, Engine was around ~220F, but Tranny exceeded 250F.

One More Question:
It appears that when tranny is locked in 3rd, stays pretty cool. Second gear appears to have 2 ranges, torque conv locked, torq conv unlocked. Locked 2nd gear, stays pretty cool. Unlocked 2nd gear, heats up. First gear, gets REALLY hotů
Is this normal?
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Old 07-21-2014, 06:21 PM
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Quote:
Originally Posted by scoutcamper View Post
Yep, we have the factory trans gauge, but the hyperpac also gives me real numbers, so i know for a fact that climbing the construction hill we were at 250F straight up, would have pulled over and stopped if at all possible, but unfortunately it is a single lane with hard barriers on each side.

Heavy Tow/Tow tune, so you suggest like a DP Custom tune? The hyperpac has simply 3 stages, We leave it in stage 1.
Had no idea on the 02's having that, and 250 is way to hot, you need to upgrade that cooler ASAP, and yes custom tow tunes like from the tuners mentioned by kris here


Edit: because of your ninja post


Did you manually select 1st and 2nd gears for this pull? That should manually lock it iirc

Last edited by 351fifty; 07-21-2014 at 06:23 PM. Reason: Ninja posted by op
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Old 07-21-2014, 06:26 PM
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First gear gets hot because theres a lot of torque convertor slip and with that much weight it creats a lot of heat. Its 1-2-3-tc lock-OD. TC locked stays cool because it's not slipping.
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Old 07-21-2014, 06:31 PM
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Quote:
Originally Posted by 351fifty View Post
Had no idea on the 02's having that, and 250 is way to hot, you need to upgrade that cooler ASAP, and yes custom tow tunes like from the tuners mentioned by kris here


Edit: because of your ninja post


Did you manually select 1st and 2nd gears for this pull? That should manually lock it iirc
01-no trans gauge 02 and up-trans gauge. And while your upgrading the cooler change your fluid as well. I know it locks it when going down hill for "engine braking" but I don't remember if it locks it for accelerating as well.
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Old 07-21-2014, 06:33 PM
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Quote:
Originally Posted by 351fifty View Post
Had no idea on the 02's having that, and 250 is way to hot, you need to upgrade that cooler ASAP, and yes custom tow tunes like from the tuners mentioned by kris here


Edit: because of your ninja post


Did you manually select 1st and 2nd gears for this pull? That should manually lock it iirc
Nope, left it in D all the way, did not know that it would be manually locked by manually putting it in first or second.
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Old 07-21-2014, 06:44 PM
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So, budget does not allow for more than one thing at a time, got to plan these things If you had to put these things in an order from first to last, how would you do it?

Custom tune/Gauges- About $700 by the time all said and done-can absolutely do install ourselves.
6.0 Trannie cooler- local shop quoted $700
Finned Trannie Pan- local shop quoted $730 includes fluid change etc.

Anything else? Is the finned pan really useful or necessary?

Last edited by scoutcamper; 07-21-2014 at 06:54 PM.
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