How do 3.73's add 1500# towing
03-01-2014, 01:40 AM
#1
How do 3.73's add 1500# towing
Looking at the 2011 f150 towing selector, a 3.73 5.0 scab or screw has a 1500# better tow capacity rating than the 3.55. How is that possible?
I noticed gvwr on the 3.73 seems to be 150# more as well.
I noticed gvwr on the 3.73 seems to be 150# more as well.
03-01-2014, 01:52 AM
#2
Senior Member
Think back to you bicycle days. You shift to a low gear. You get more torque but have to pedal more. Same thing with 3.73 over 3.55 the latter has to spin more giving more torque hence being able to tow more.
03-01-2014, 01:53 AM
#3
Senior Member
In my experience in setting up differentials when I wrenched for a living, the +/- 3.50 mark in gear ratios was the cut-off point. Anything lower (higher number) than about 3.50 - 1 ratio had much beefier ring gears than the higher (lower numbers) gear ratios.
GVWR is not only rated on what the springs/suspension can hold, but what the running gear can safely motate for extended mileage. The most critical is the diff gears.
I'm sure someone will jump in and add/detract from this info.
GVWR is not only rated on what the springs/suspension can hold, but what the running gear can safely motate for extended mileage. The most critical is the diff gears.
I'm sure someone will jump in and add/detract from this info.
03-01-2014, 03:14 AM
#4
Senior Member
Because Mfgs can make it up as they go along right now. I seriously doubt that gear change actually provides for another 1500 lbs towing power! Here's a great article how the mfg's play with those numbers……..
http://www.autonews.com/article/2013...-isnt-standard
http://www.autonews.com/article/2013...-isnt-standard
Last edited by cthusker; 03-01-2014 at 03:19 AM.
03-01-2014, 04:12 AM
#5
im asking because i have my 3.55 scab and am looking at travel trailers. I know i need to stay around 5300-5600lbs dry weight, 6300 loaded.
If i trade mine in on a 3.73 SCREW, i can look at heavier trailers and open up my options. But if the numbers are fluff, maybe i continue on with my truck.
If i trade mine in on a 3.73 SCREW, i can look at heavier trailers and open up my options. But if the numbers are fluff, maybe i continue on with my truck.
Last edited by missionman; 03-01-2014 at 04:20 AM.
03-01-2014, 06:12 AM
#6
Senior Member
If you trade it in get the max tow package, it comes with 3.73 as well as
Max Trailer Tow Pkg - Manual/Power Mirror
Max Trailer Tow Pkg - Manual/Power Mirror
- Gross Vehicle Weight Rating: 7,700 lbs Payload Package
- Auxiliary Transmission Oil Cooler
- SelectShift Transmission
- Upgraded Radiator
- Includes manual telescoping/manual folding, 7-pin wiring harness, class IV trailer hitch receiver and upgraded rear bumper.
03-01-2014, 07:54 AM
#7
Power band. It may use slightly more fuel when not towing, but with my camper behind my truck, it will actually stay in 6th gear on the highway on smaller hills because of the amount of torque available at lower RPMs with the EB.
But also as mentioned, adding the 3.73 axle also includes the max trailer tow or max payload packages depending if you go with a limited slip or locker. So part of the difference is also attributable to the heftier springs/shocks and upgraded cooling.
But also as mentioned, adding the 3.73 axle also includes the max trailer tow or max payload packages depending if you go with a limited slip or locker. So part of the difference is also attributable to the heftier springs/shocks and upgraded cooling.
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