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Mandeville, La

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Posted: 11/07/20 09:23pm Link  |  Quote  |  Print  |  Notify Moderator

I've always ordered a 4.30:1 (or similar) rear for the tow vehicle. Less strain on the drive train / added torque when you need it. With the new 10 speed transmissions, you don't seem to pay has heavily mpg-wise as in the old days for the 4+ gears. (I just ordered a new F350 with the 7.3L engine and 4.30:1 rear. )


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blaczero

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Posted: 11/09/20 06:37am Link  |  Quote  |  Print  |  Notify Moderator

Thanks everyone for their response, I learned a lot.

4x4ord

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Posted: 11/09/20 07:46am Link  |  Quote  |  Print  |  Notify Moderator

You’ve probably got your reasons for wanting a 7.3 dually but have you considered either spending another 7k and going with a SRW diesel? Or buying a slightly used diesel for the same money you’d be spending to get a gasser?


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ACZL

UPstate,NY

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Posted: 11/09/20 08:29am Link  |  Quote  |  Print  |  Notify Moderator

My '15 F350 SWR,cc, 4x4 ,sb, 6.7 had 3.55 gears, 6sp tranny and it ran (I think...frigging CRS!) around 2,000 at 70 mph. The ;17 F350 DWR, cc, 4x4, 6.7, 4.10 gears, 6 sp tranny is at 2100 rpms at 70 mpg. Towing rig in sig, it's getting 8.5-9.0 mpg. It's true the gasser will not get as good as mpg towing as a diesel will, but consider down the road and you want to get a bigger RV. The 4.30 will be better for the whole truck. I like the idea another poster mentioned about considering a used SWR or even a DWR diesel. If sticking w/ Ford, 3.55 w/ the 6 sp and heard that w/ the 10 Spd they are utilizing 3.31 gears. My '17 was an off the lot purchase and came w/ 4.10's. I would have liked to have 3/73's, but overall, happy w/ the 4.10's.


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justme

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Posted: 11/09/20 12:20pm Link  |  Quote  |  Print  |  Notify Moderator

I would suspect the new 10-speed trany will do the job because of its extended torque ratios. However, I am concerned about gear hunting while pulling heavy loads and inclines. Seems to me gear hunting will shorten the life of the trany while doing a lot of towing or heavy hauling-- especially with gas engines.

C Schomer

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Posted: 11/23/20 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

Being it will be your only vehicle, I’d say 3.73 Unless you will be mostly towing in the mountains. That would be me! Craig

way2roll

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Posted: 11/24/20 05:07am Link  |  Quote  |  Print  |  Notify Moderator

justme wrote:

I would suspect the new 10-speed trany will do the job because of its extended torque ratios. However, I am concerned about gear hunting while pulling heavy loads and inclines. Seems to me gear hunting will shorten the life of the trany while doing a lot of towing or heavy hauling-- especially with gas engines.


My NEW F350 with the 10 spd tranny doesn't gear hunt. It's a diesel so perhaps that helps, but it's a very smart truck. It's built to tow and it does it very well. If there is a gear change, it's hardly noticeable. But usually climbing it finds the proper gear at the proper speed and just stays there not breaking a sweat despite changes in grade.


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lenr

Indianapolis, IN

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Posted: 11/25/20 02:46pm Link  |  Quote  |  Print  |  Notify Moderator

If the 10 speed heavy duty transmission can handle 1050 ft lb of torque from the diesel then it can well handle 475 ft lb from the 7.3 gas pushing a 3.73 axle. Also, 1st gear in the 10 speed is 4.615 up from 3.97 in the 6 speed. It's hard to believe that a 4.615 ratio connected to torque converter would have a hard time starting any load.

rhagfo

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Posted: 11/25/20 03:50pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

You’ve probably got your reasons for wanting a 7.3 dually but have you considered either spending another 7k and going with a SRW diesel? Or buying a slightly used diesel for the same money you’d be spending to get a gasser?

[emoticon]
Why go down to SRW from a plan to get a DRW gas TV, that doesn’t make sense!
The gas DRW will have about 800# more pay load to a diesel DRW, and and about 2,200# to 2,400# more than a F350 SRW.
I can see recommending a DRW diesel for pulling power, but the OP wants gas.


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4x4ord

Alberta

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Posted: 11/25/20 05:57pm Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

4x4ord wrote:

You’ve probably got your reasons for wanting a 7.3 dually but have you considered either spending another 7k and going with a SRW diesel? Or buying a slightly used diesel for the same money you’d be spending to get a gasser?

[emoticon]
Why go down to SRW from a plan to get a DRW gas TV, that doesn’t make sense!
The gas DRW will have about 800# more pay load to a diesel DRW, and and about 2,200# to 2,400# more than a F350 SRW.
I can see recommending a DRW diesel for pulling power, but the OP wants gas.


For what he is pulling he doesn't need DRW nor does he need a diesel. The dually might be nice while towing but the diesel would be reeeeeally nice; and the dually is a bit of a nuisance when not towing.

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