H & E
North Texas
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I have a 2005 Escalade EXT that I tow the TT with. It does great and will stay in high with the torque converter locked when on flat highway if I keep the speed above 60MPH. I am thinking of having the 3.73 gears changed to 4.10 gears. I am hoping that the transmission will perform better. I haven’t researched this yet because I am not sure whom to ask. The truck is all wheel drive that is electronically controlled and I do not want to loose that feature. Need someone that is familiar with the system to advise and don’t think the dealer is the right one.
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b_salgado
Salisbury ,NC,USA
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Changing the gearing will not affect your AWD. You will need to change both front and rear differential gears. IMHO, going from a 3.73 to a 4.10 is not going to net you much of a difference. The cost vs. the benefits will not balance out.
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Drifter_59
Concord, NC
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I believe that if you are within the towing specs of the manufacturer, changing the front and rear gears won't help much and the cost will take a long time to recoup.
Enjoying Life with the 4 legged pal, Dexter (boxer/lab mix).
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smkettner
Southern California
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It will be a measured improvement going from 3.73 to 4.10. Noticable but not big. Downshifting will be reduced and holding lockup will increase.
4.56 would make a big change especially if you have oversize tires. Just check if the computer needs a reprogram for the gears or if it is automatically changed through the speed sensors.
* This post was
edited 10/05/08 11:12pm by smkettner *
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b_salgado
Salisbury ,NC,USA
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smk...... 3.73 to 4.56 will make a huge improvement. But the original poster said that he was only going to a 4.10 from a 3.73. That will not net a huge difference. A 4.30 would be better for improvement. If I were to change gears from a 3.73, it would have to be at least a 4.30. But then, if you drive it daily, there goes any MPG that you might be getting. If it's just used for towing, I say go for it!
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jandpc4176
Las Vegas
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I have an 06 WW FK1900 and pull it with an 06 Tundra 4x4 DC with an equilizer WD hitch/firestone airbags/updraded shocks. I added a level kit to raise the front end up just enough to add BFG 285s D rated. I have 3 question: 1) is it possible to change the rear differential gears in my tundra to make it tow better and bring back the stock feel with the bigger tires?
2) Do you think I need to make this change with the rig I pull?
3) Do I need or should I get any other modifications to my Tundra to help it pull better and work a little less on those long trips to Glamis?
I have the tow package with the tranny cooler but no guage to tell if it's getting hot.
Thanks for all,
Jon
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SoCalDesertRider
SanDiego, CA, USA
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Joined: 12/14/2003
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jandpc4176 wrote:I have an 06 WW FK1900 and pull it with an 06 Tundra 4x4 DC with an equilizer WD hitch/firestone airbags/updraded shocks. I added a level kit to raise the front end up just enough to add BFG 285s D rated. I have 3 question: 1) is it possible to change the rear differential gears in my tundra to make it tow better and bring back the stock feel with the bigger tires?
2) Do you think I need to make this change with the rig I pull?
3) Do I need or should I get any other modifications to my Tundra to help it pull better and work a little less on those long trips to Glamis?
I have the tow package with the tranny cooler but no guage to tell if it's getting hot.
Thanks for all,
Jon
1- Yes, it is possible. I did it on my truck. Changed both axles from 3.55 to 4.56 and put in a locking differential in the rear axle at the same times. Best modification I have made to the truck so far. Take the truck to any local axle and driveline shop and they can make the change for you.
2- With an upgrade from stock size tires to 285's with small gas engine in a truck used for towing, changing to lower gears is almost a necessity to get back the power lost from the larger tires. I went from stock size 31.5" tires to 33" tires (285's) and the gear change made all the world of difference in the towing power of the truck. Very worthwhile investment!
3- I would do lower ratio gears, a locking rear differential, E-rated rear tires and heavier rear springs (and I did exactly that too, check the info in my sig) for the use you are describing.
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C Schomer
Buckeye, Az.
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Cost effectiveness is only a small part of it. Driveability and making the engine/trans work easier means a LOT more to me! My bro loves the 4.10s in his 3/4T Chev auto trans p/u. I love my 4.10s but I'd love 3.9 even better cuz of the slower turning diesel. A good trans shop will be able to help you out. You have to consider which gear is safe for towing (it might not be OD, depending on the trans) to get to the best final ratio and be in a good engine power range. I use a sliding gear calculator I got from a race shop. Craig
2003 Dodge HO CTD, NV5600, 4.10. Real 1Ton - pregnant with twin spare tires, 4WD - all on the rear. Aurora 2000 turbo, Diablo Predator, 4" muffler. 98 Sunnybrook 30RLFS 5th wh. WHOEVER INVENTED WORK DIDN'T HAVE AN RV!
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H & E
North Texas
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It will be a measured improvement going from 3.73 to 4.10. Noticable but not big. Downshifting will be reduced and holding lockup will increase.
I am just looking for about a 300-RPM increase so I can slow to 55 and stay in high with the converter locked up. Lots of the roads we travel have a 55 MPH speed limit that other drivers maintain which cause me to also.
I just heard about a four-wheel drive specialty shop in the area that I am going to talk to.
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smkettner
Southern California
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3.73 to 4.10 is about 10% change. So if you are cruising at 3000 rpm you will get 300 rpm increase. 3.73 to 4.56 is 22% increase so if you are cruising at 2200 rpm you will get to 2684 rpm.
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