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Open Roads Forum  >  Tow Vehicles

 > 3.73 vs 4.10

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ebrv

Massachusetts

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Posted: 06/27/11 09:16pm Link  |  Print  |  Notify Moderator

I was beginning to search for a new vehicle to replace my 2001 Chevy 2500 hd. I tow a 32 ft travel trailer that weighs approx 7000 lbs dry weight. I have 4.10 gears in the truck now. I didn't know if I should look for that option with the new Chevy/GMC 2500 HD's and the 6.0L /6 spd transmission or is the 3.73 adequate in the newer models. I may go a little bigger too with the next trailer. Any opinions?

Bob/Olallawa

Kitsap Co, WA

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Posted: 06/27/11 09:23pm Link  |  Print  |  Notify Moderator

Adequate? maybe, but why go 3.73 if the 4.10 is offered. Only about 1 mpg difference for a lot better towing performance.


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johnrbd

San Joaquin Valley

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Posted: 06/27/11 09:38pm Link  |  Print  |  Notify Moderator

Go big or stay home. Get the 4.10 if available option.





blt2ski

Kirkland, Wa

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Posted: 06/27/11 09:47pm Link  |  Print  |  Notify Moderator

For most folks, the 3.73 or even 3.42 with the new 6 spd will have plenty of get up and go, way more than the old 4L80E 4.10 or even a 4.56 or lower axel ratio. As the first gear is 4.x-1 vs 2.5-1 for the 4l80. So you get your DOD for max MPG, a really low first gear for get up and go torque multiplication.......

If you drive empty on teh freeway at 65-70 mph, the 3.73 or 3.42 is good. If you are like me, and spend most of it at 60 mph and lower, then the 3.73 would be ample, a 4.10 a bit better. For my driving, the 4.10 would be the choice, but if I was in an area where I could go 70 frequently enough, the 3.73 would be my choice or even a 3.42! For the ave person, 4.10's are frankly overkill with the new 6 sp auto. I could see 4.10s being a thing of the past with the new tranny's like the 6l90e that have come out!

marty


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lawnspecialties

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Posted: 06/27/11 10:10pm Link  |  Print  |  Notify Moderator

The only negative to my F450 is it doesn't have a 3.73. That's all I've had until now and at least with all my past Fords, the trucks were more than capable to pull hard with that ratio.


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Yahooligan

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Posted: 06/27/11 10:17pm Link  |  Print  |  Notify Moderator

blt2ski wrote:

For most folks, the 3.73 or even 3.42 with the new 6 spd will have plenty of get up and go, way more than the old 4L80E 4.10 or even a 4.56 or lower axel ratio. As the first gear is 4.x-1 vs 2.5-1 for the 4l80. So you get your DOD for max MPG, a really low first gear for get up and go torque multiplication.......

If you drive empty on teh freeway at 65-70 mph, the 3.73 or 3.42 is good. If you are like me, and spend most of it at 60 mph and lower, then the 3.73 would be ample, a 4.10 a bit better. For my driving, the 4.10 would be the choice, but if I was in an area where I could go 70 frequently enough, the 3.73 would be my choice or even a 3.42! For the ave person, 4.10's are frankly overkill with the new 6 sp auto. I could see 4.10s being a thing of the past with the new tranny's like the 6l90e that have come out!

marty


You nailed it, the transmission is doing more of the torque multiplication in the lower gears now so where 4.10 gears were needed before you only need 3.73 for the same or better towing experience.

On the other hand, being a gasser and not a diesel, the 4.10 option may be a little more helpful with the 6.0. Would need input from an owner of such a beast.

In any case, there's no comparing 4.10s with the old 4-speed autos and 4.10s with the newer 6-speeds. Totally different ballgame.


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Bob/Olallawa

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Posted: 06/27/11 10:38pm Link  |  Print  |  Notify Moderator

I have the 4 speed with 4.10's and to me it isn't so much the low gear power as it is keeping the rpm at or above 3,500 rpm when towing up hill. If the 4.10 and 6 speed would keep me one gear higher than 3.73 and 6 speed then I would be having a better climb. With my 4 speed I don't spend much time in od while towing, just too much uphill or head wind for that. I guess it depends on how much he tows and how flat the ground is he drives on.

blt2ski

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Posted: 06/27/11 11:20pm Link  |  Print  |  Notify Moderator

Bob,

Depending upon the speed you are climbing, HP available, a 3.73 may be the better ratio for you. My old truck had 4.10s and a manual 5 sp. When I lost power/rpms at 50 and had to shift down out of direct to 3rd, I would go all the way down to about 35-40, that was 2500-2700 with the diesel motor in it. i could get to 3500 and 50 mph! but who wants to run at redline! be it a diesel or gas rig. I found for that 6.5td I had, the 2500-2700 to be a nice rpm to climb hills around here. Reality is, with 3.73's or even a 3.42 rear, or if I would have had a 6 sp NV manual instead of the 5 sp, either option would have allowed me to hang on to the lower gear, along with staying at a faster rate up the hill. ie instead of 35-40, I probably would have been in the 40-45 range at 2500-2700 rpms. With 185 hp, that motor did not have the HP to hold 50+ up say I90 snoqualmie. I could have low 40's with my TT at 15K lbs.

Marty

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Posted: 06/28/11 07:45am Link  |  Print  |  Notify Moderator

Check out this thread from last year... HERE


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APT

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Posted: 06/28/11 06:18am Link  |  Print  |  Notify Moderator

I test drove a new Suburban 6.0L/6-spd/3.73. I'd still rather have the 4.10. While the 6-spd helps tremendously, the 6.0L seemed weak below 3000rpm and shorter gearing will get it into the happy range quicker.


A & A parents of DD 2005, DS1 2007, DS2 2009
2011 Suburban 2500 6.0L 3.73 pulling 2011 Heartland North Trail 28BRS
2017 Subaru Outback 3.6R

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