Gear change....no whipple flare tool required...

fordguys550 · Mar 23, 2017

Hey guys, i contacted MPT about changing my rear gears and wether otlr not the whipple flare tool is required....i just picked up everything to put 373s in my car, and mpt said....all i need to do is select 373 when i load my tune, amd nothing else is required.....????

2015 Silver GT · Mar 23, 2017

They have no idea what they're talking about.

Viperbluecobra · Mar 23, 2017

2015 Silver GT said:
They have no idea what they're talking about.

This.

stang1971 · Mar 23, 2017

agreed..... they have no clue..... you can change it with a whipple flare tool or with a obd2 device and forscan.

tuners CAN NOT change gear info unless some how they can change the bcm settings with a tuning device... No one else has been able to yet.

Grintch · Mar 27, 2017

stang1971 said:
agreed..... they have no clue..... you can change it with a whipple flare tool or with a obd2 device and forscan.

tuners CAN NOT change gear info unless some how they can change the bcm settings with a tuning device... No one else has been able to yet.

Uhh, aren't all tuners "OBD2 devices"?
If Ford's Power Pack 1 tuner can do it, why can't the aftermarket figure out how to do it?

Legionofone · Mar 27, 2017

Just change the as built data to 3.73s you shouldn't need anything special unless the car didn't come with the rear end option.

Get This
https://www.amazon.com/OHP-ELMconfig-compatible-interface-diagnostics/dp/B01F0GVBWY

Follow this guide
http://www.mustang6g.com/forums/showthread.php?t=61773

and change this BCM value.

Rear Axle Ratio (3.73) Enabled BCM 0726-12-01 0175 xxxx xxxx

2015 Silver GT · Mar 27, 2017

Grintch said:
Uhh, aren't all tuners "OBD2 devices"?
If Ford's Power Pack 1 tuner can do it, why can't the aftermarket figure out how to do it?

Ford's PP can't do it.

Grintch · Mar 29, 2017

2015 Silver GT said:
Ford's PP can't do it.

They claim it does.

M-9603-M8 - Power Pack 1
Fits 2015-2017 Mustang GT
Features exclusive no-lift shift strategy and enhanced throttle response
Ford Performance calibrations feature exclusive Ford proprietary software and engineering*
Ford Performance calibrations are 50 state legal with CARB EO (D-598-19)
Calibrations available for manual and automatic transmission
Allows gear ratio changes up to 4.09:1
Automatic calibrations feature optimized performance shift schedule
Premium fuel, 91 octane or higher, is required

2015 Silver GT · Mar 29, 2017

Grintch said:
They claim it does.

M-9603-M8 - Power Pack 1
Fits 2015-2017 Mustang GT
Features exclusive no-lift shift strategy and enhanced throttle response
Ford Performance calibrations feature exclusive Ford proprietary software and engineering*
Ford Performance calibrations are 50 state legal with CARB EO (D-598-19)
Calibrations available for manual and automatic transmission
Allows gear ratio changes up to 4.09:1
Automatic calibrations feature optimized performance shift schedule
Premium fuel, 91 octane or higher, is required

Don't believe everything you read. Changes are made through the BCM. Something they don't have the ability to do.

fordguys550 · Apr 10, 2017

Interesting info guys. Tha ks for the heads up. I figured mpt didnt know what was going on...they are still living in the s197 days i guess. Now i think my resr hub bearings are going out..so thats awesome. Sure wish ford would go back to using quality parts in their cars...

Gear change....no whipple flare tool required...

fordguys550

yep..."just" a V6

2015 Silver GT

Well-Known Member

Viperbluecobra

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stang1971

Well-Known Member

Grintch

Well-Known Member

Legionofone

Well-Known Member

2015 Silver GT

Well-Known Member

Grintch

Well-Known Member

2015 Silver GT

Well-Known Member

fordguys550

yep..."just" a V6