Highest Ratio Rear on SRW F350 is 3:55??? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 04-04-2010, 06:26 PM Thread Starter
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Highest Ratio Rear on SRW F350 is 3:55???

I currently pull a 13,000 lb. fifth wheel RV trailer with a 2008 F350 SRW 6.4 with a 3:73 rear. I notice on the build and price site that the 2011 SRW with the 6.7 only comes with a 3:55 max.

Does Ford think the extra HP and Torque will make up for the lower rear end ratio or will there be a loss of pulling capability??? What do you guys think???
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post #2 of 11 Old 04-04-2010, 06:39 PM
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That and the six speed transmission.
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post #3 of 11 Old 04-04-2010, 07:22 PM
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The transmission is the same from the 250 to the 750, I currently have a 250 w 3:55's and pull an 8k bumper pull with the 6.4 no problem, I anticipate the 6.7 with more tq/hp will not have any difficulty. There are links to Ford's Arizona "field day" with these trucks showing off elsewhere in this forum.

Driving: 2011 Pale Adobe...F-350 CC 6.7 FX4 3:55-Locking Rear End-Dual Alternators-premium Lariat, moon rf, added wheel flares, 2-tone black base

Picked up 4/29/10 as of 06/20/2012 109,000+miles
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post #4 of 11 Old 04-04-2010, 10:27 PM
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first gear on the new 6 speed is lower then it is on the 5 speed. thats where it making up for the gear change.

08 f350 KMC wheels with 33" MTZs, bed rails with a reese 20k slider, 5% tint all around, 60gal fuel box, kenwood monitor, afe drop in filter, livewire w/innovative tunes, sinister egr delete, twisted stage 3 trans

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post #5 of 11 Old 04-06-2010, 06:26 PM Thread Starter
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So, with the 3:55 ratio, more HP and Torque on the 6.7, and another gear on the transmission will it pull better than my 6.4??? I hope to order one next year. Why do you all think Ford is not offering the 3:73 on the SRW 6.7??
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post #6 of 11 Old 04-06-2010, 06:35 PM
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For the fuel economy.

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post #7 of 11 Old 04-06-2010, 07:05 PM
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They're doing the same with Dodges. 3:42 gears are now standard, 3:73s are now optional

Back to the blue oval: 08 F350 FX4 CCLB - DPF/EGR delete - Spartan tuner - S&B CAI - 4 in DP to 5 in SP

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post #8 of 11 Old 04-07-2010, 08:55 AM
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Quote:
Originally Posted by blenhardt View Post
Why do you all think Ford is not offering the 3:73 on the SRW 6.7??
It's no longer needed.

jmelendy
2008 F-250 Job #1 Purchased 2/08
PSD, XLT, Crew, 3.73
My first Diesel
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post #9 of 11 Old 04-07-2010, 09:40 AM
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was playing with the build it price it thing on the ford sight and there is a 3.73 op

3.31 open is standord and 3.55 and 3.73 open or limited. for somr reason you cant the E-locker with the 3.73 =\

it says the that the tow rating is only 14,ooo. for the SCSB srw350 with 6.7 and 3.73. that seems why low i

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Last edited by 1tonpower; 04-07-2010 at 10:02 AM.
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post #10 of 11 Old 04-07-2010, 10:04 AM
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Quote:
Originally Posted by 1tonpower View Post
was playing with the build it price it thing on the ford sight and there is a 3.73 op

3.31 open is standord and 3.55 and 3.73 open or limited. for somr reason you cant the E-locker with the 3.73 =\
The 3.73 and 4.30 gears are gas or DRW diesel option not available on a diesel SRW PU:



Otherwise this handy little chart below has been shamelessly copied and pasted:
TorqueShift 5R110 (2003-2010)
3.11, 2.22, 1.55, 1.00, 0.71
w/ 3.55
11.04, 7.88, 5.50, 3.55, 2.52
w/ 3.73
11.60, 8.28, 5.78, 3.73, 2.65
w/ 4.30
13.37, 9.55, 6.67, 4.30, 3.05

TorqueShift 6R140 (2011-)
3.97, 2.32, 1.52, 1.15, 0.86, 0.67
w/ 3.31
13.14, 7.68, 5.03, 3.81, 2.85, 2.22
w/ 3.55
14.09, 8.24, 5.40, 4.08, 3.05, 2.38
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