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Old 12-01-2014, 09:10 AM   #1
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Gears and warranty

Which warranty do gears fall under?

I'm itching to move up from the 2.73s but want to avoid risking my warranties.

What cruising rpms can I expect in 6th at 75mph with the various gears?
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Old 12-01-2014, 09:14 AM   #2
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Gears and warranty

3.31 gears

I think they might have to be installed by Ford as well, Im not sure though


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Old 12-01-2014, 09:54 AM   #3
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with my MT 3.31 70 mph = 2100 rpm

Unless you have a Ford dealer install/re-flash you MAY loose some of your wtty...talk with your dealer.
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Old 12-01-2014, 10:38 AM   #4
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My auto/3.73 is a bit over 2200rpm @ 70mph.
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Old 12-01-2014, 03:15 PM   #5
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Your dealership would have to really be looking hard for reasons to specifically void your warranty, in order to go through the time/effort to check for things like the ring and pinion ratio not being stock...Unless you also have the speedometer/odometer recalibrated.
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Old 12-01-2014, 03:19 PM   #6
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My ford dealer said I can do 3.73 because it is something they can flash since the Shelby's have 3.73


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Old 12-01-2014, 03:46 PM   #7
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My ford dealer said I can do 3.73 because it is something they can flash since the Shelby's have 3.73


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I'd run very far from that dealership considering they aren't aware there's never been V6 Shelby.
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Old 12-01-2014, 04:03 PM   #8
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3.31 is the highest they can flash for as that's what was offered in the v6 performance package. Past that they would have to tinker with tire size settings to get it close, but it won't be spot on without an actual aftermarket tune.

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Old 12-01-2014, 04:22 PM   #9
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They said it didn't matter what motor was in it


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Old 12-01-2014, 04:27 PM   #10
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Just about the rpms the transmission switchs at


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Old 12-01-2014, 04:28 PM   #11
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Quote:
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My auto/3.73 is a bit over 2200rpm @ 70mph.

Did you have to use a tuner?


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Old 12-01-2014, 04:43 PM   #12
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They said it didn't matter what motor was in it


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Negative.

You can't flash a 3.7 with a 5.0 or a 5.8 tune.

You'd need a custom tune for anything that isn't 2.73 or 3.31.
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Old 12-01-2014, 04:45 PM   #13
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Originally Posted by Matts14fp6 View Post
Did you have to use a tuner?


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Yeah, have to use a tuner unless you go 3.31 since 3.31 was a factory option.

Some dealerships will flash the 3.31 program on there for about $100.
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Old 12-01-2014, 05:01 PM   #14
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Well damn, looks like I'm going to have to void my warranty with a tune


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Old 12-01-2014, 06:27 PM   #15
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Just spoke with ford factory and it can be done on a 3.7l at the dealership, however it is not a ford recommended move, and the dealership has to feel comfortable doing it. Also it voids the fords factory warranty for your rear end


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Old 12-01-2014, 06:31 PM   #16
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Ford doesn't offer 3.73s on our 3.7s, so a ford factory tune wouldn't be possible because they just don't offer it. Maybe your dealer will use a Steeda tune or something else. I went through this very issue when I went to 3.73s and I can tell you it won't be a factory ford tune you'll be getting.

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Old 12-01-2014, 07:01 PM   #17
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Quote:
Originally Posted by Matts14fp6 View Post
Just spoke with ford factory and it can be done on a 3.7l at the dealership, however it is not a ford recommended move, and the dealership has to feel comfortable doing it. Also it voids the fords factory warranty for your rear end


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Yeah, the dealership will put the actual gears in, that's not the problem (aside from getting butt raped on price) but they won't be able to calibrate it. Your speedo, odo and shift points will all be off.
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Old 12-01-2014, 08:02 PM   #18
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The ford factory said they will be able to calibrate and set it up if they have the right tools, not all dealerships have those tools


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Old 12-01-2014, 08:09 PM   #19
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Is the rear end considered drivetrain or is it under the number to bumper warranty?

I think I would like 3.73s but I think it would be a pain with 110 miles of highway, sometimes bumper to bumper. 3.31s sound like they would be more commuter friendly.

The 2.73s are great for highway cruising I just want to bump that 6th gear rpm up to 2k at 75mph. At 75 now in about 1750rpm and on any incline, the Roush hums something awful. I either have to push it up to 80 or down to 70 to get out of that zone.
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Old 12-01-2014, 08:20 PM   #20
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3.73's get to speed quicker, they actually say you get better gas mileage in the city with them, that's one of the reasons I chose 3.73's


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Old 12-01-2014, 08:37 PM   #21
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Quote:
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The ford factory said they will be able to calibrate and set it up if they have the right tools, not all dealerships have those tools


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I'm really questioning the info you're getting.

Your dealership also said they could calibrate your 3.7 for the 3.73s because the Shelby's have them, which can absolutely not happen with a Ford made tune.

What's the name of your dealership? If they can do the 3.73s and tune it, I'd be willing to make the trip from Delaware.
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Old 12-01-2014, 09:09 PM   #22
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Quote:
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3.73's get to speed quicker, they actually say you get better gas mileage in the city with them, that's one of the reasons I chose 3.73's


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It's the opposite. Crap city mileage, only marginally worse highway.

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Old 12-02-2014, 08:52 AM   #23
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Capitol ford in Charlotte nc


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Old 12-02-2014, 04:48 PM   #24
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Gears and warranty

Quote:
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It's the opposite. Crap city mileage, only marginally worse highway.

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Please note your tune will affect mpg as well. An aggressive tune cares more about power than gas.

My car has 3.73s and I do run an aggressive tune. There was some change in town mpg and a 4mpg decrease highway. However, driving conditions are really important -- my commute to work is only a few miles but with max speed of 35, and so many stop lights I spend 40% of the drive standing still. This means I get about 16 mpg when I'm easy on the accelerator -- but that's much better than the 12-14 I had on my 2.73s...


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Old 12-05-2014, 01:58 PM   #25
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My ford dealer said I can do 3.73 because it is something they can flash since the Shelby's have 3.73


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They are so wrong.

The dealership can not flash for 3.73 on a V6 mustang.

Ask them how many they have done, bet ya it is zero.
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Old 12-08-2014, 08:49 PM   #26
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Gear Change

Probably the 3.31 s since that is what Ford certifies. I have attached a spreadsheet showing ratios and speeds based on the six speed standard. I chose to go from the 2.73 to 3.55.
Attached Files
File Type: xlsx GEAR RATIO ANALYSIS.xlsx (43.0 KB, 61 views)
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Old 12-09-2014, 08:10 AM   #27
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Your chart seems off for 6th. My rpm at 80 in 6th is almost 2k. 90 would put me at about 2200-2300.
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Old 12-09-2014, 03:54 PM   #28
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I may not have the correct 6th ratio. Will check on that.


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