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Old 09-09-2014, 04:21 PM   #11
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A number of years ago I had a 2001 Chevy with the 6.0L gas engine and 3.73's.
We traded up to a 30' 5th wheel and had a trip to Colorado planned that summer. After a few local trips and unhappy with its performance, I paid to have 4.10's put in.

The truck was still under powered IMO, and when my FIL offered to sell me his 97 Dodge with CTD I bought it. I put on some mild mods and I'm still driving it (only 113k miles), and its never been under powered in any terrain.

I wasted money on the 4.10 swap on my truck, and I'm betting you'll feel the same if you do it. I'd get a different truck.
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Old 09-09-2014, 04:23 PM   #12
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I believe I would spend the $ to find out why it shifts into OD at any speed when the T/H mode is engaged. Something is definitely amiss.
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Old 09-09-2014, 04:25 PM   #13
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My truck(diesel) has 4:10 gears. If I keep about 2000 RPM's the fuel mileage is ALOT better.

I guess about every town has a 4x4 shop. That's who I would get to change the gears. They do it a lot and prolly cheaper. Some GM's you have to change part of the carrier to change to some ratios. They can tell you.

I really don't see a lot of difference in performance except at take off.


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Old 09-09-2014, 08:03 PM   #14
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Don't forget to add the cost for the front too if it's 4x4.
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Old 09-10-2014, 08:35 AM   #15
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I went from 3:73 to 4:30.......made a world of difference. Got better mileage towing and lost a little empty. Use the truck almost 100% just towing my 5ver so the mileage empty is not even considered. I hold OD longer and not even go into 2nd gear any longer. Since we are full time.....it worked for us.
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Old 09-10-2014, 09:03 AM   #16
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I believe I would spend the $ to find out why it shifts into OD at any speed when the T/H mode is engaged. Something is definitely amiss.
The tow/haul button does not lock out OD, it moves the shifts points depending on speed and load. You never hit OD because you drive like an OLD COOT.

One thing I haven't seen is (maybe I missed it), but what kind of trailer and/or weight is the OP pulling. This will make a difference on whether a gear change would be worth it.
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Old 09-10-2014, 09:07 AM   #17
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The tow/haul button does not lock out OD, it moves the shifts points depending on speed and load. You never hit OD because you drive like an OLD COOT.

One thing I haven't seen is (maybe I missed it), but what kind of trailer and/or weight is the OP pulling. This will make a difference on whether a gear change would be worth it.
Like I said, AquaMan, I very rarely tow over 65 and it doesn't get into OD.
65 is max on the st tires.
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Old 09-10-2014, 09:45 AM   #18
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Pulling with a 03 suburban 1500 5.3 with 3.73 gears. Jumping up to the bigger trailer I've noticed more of a struggle to stay in OD. Currently on any kind of an inclince it drops into 3rd and sometimes second. At 62 mph and in OD I'm turning about 1900rpm. I'm guessing 4.10s would put me somewhere around 22-2300 rpm. Would this increase in RPM be noticeable? Also would this affect my towing mpg for the better considering I'd stay in OD a little longer? BTW I do tow in tow/haul mode. apparently the GM tow/haul mode just firms up shifts and holds passing gear a little longer.
Gears downshifting during any incline while towing your TT with any gas engine is normal...plus, heavier the rv, harder the engine/tranny has to work to keep speed...also, your 5.3 performance specs in a 2003 is a lot different than 5.3's of newer trucks with a tow package setup...it is what it is
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Old 09-10-2014, 02:40 PM   #19
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One thing I haven't seen is (maybe I missed it), but what kind of trailer and/or weight is the OP pulling. This will make a difference on whether a gear change would be worth it.
TT is a 2010 surveyor sport 295 dry weight 4815. Haven't hit the scales but currently we travel very very light so I'd bet on not being over 6k
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Old 09-10-2014, 06:54 PM   #20
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If you are/will be full timing in it, I would think you are at your top end of GVWR for the camper. Now how far do you plan on traveling overall? How long do you plan on traveling between spots? And how long do you plan to stay in one spot? This will help give us an idea on actual need vs want.


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