355 ring and pinion - Ford Mustang Forum
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post #1 of 6 (permalink) Old 11-14-2016 Thread Starter
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Cool 355 ring and pinion

Hi guys , haven't been here in awhile, it's good to be back. Want to change the gears out in my 2011 gt auto with 315's in the rear. Want to go to 355's. Why? Because although my car is plenty fast as is, I want better drivability on the street, and quicker acceleration, and good low rpm cruising on the freeway. Has anybody done this with their automatic 315 rear end car?

At 75 mph the engine is at 2000 rpm. That's normal cruising speed here in SoCal on the freeway.

Please guys don't turn this into a 373, 410 gear thread.

BUT, if you do have 373's with an automatic, can you tell me what rpm your at while doing 75mph?




2011 GT/ California Special, Silver, Auto, 3:15's, Airaid race CAI, Hypertech tune, Roush axlebacks and lowering springs, Boss 302 splitter, SR front and rear swaybars, 19x9.5 SVE gloss black Drift wheels,BMR lower control arms, Brembo big brakes up front,Stainless steel brake lines, JMS Pedalmax.
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post #2 of 6 (permalink) Old 11-15-2016
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The automatic does best with the stock 315s, or at most, 331s. Your first gear is too short for anything more.
Any increase in gear will increase your cruising rpm.
The auto has a 6th ratio of .69, so with 3.73s your car would be about 2400 if you have a stock height (27") tire. With 3.55s you'd be at about 2300.

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post #3 of 6 (permalink) Old 11-15-2016
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Been covered, you don't need more gear, you want a converter as the stocker is rather soft ,, barring that get a tune that firms up the shifting and see how that works.

,

2010 Grabber Blue Mustang GT, Forged 4.6L Roush TVS and other stuff ... The modding shall never end ...

Wife's car ... 2014 Sterling Gray Premium GT 401A, stock for now ..
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post #4 of 6 (permalink) Old 11-15-2016 Thread Starter
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Is the 6 speed auto the same in the 2015-16 Mustangs? I think Ford offers a 355 ratio for those cars.



2011 GT/ California Special, Silver, Auto, 3:15's, Airaid race CAI, Hypertech tune, Roush axlebacks and lowering springs, Boss 302 splitter, SR front and rear swaybars, 19x9.5 SVE gloss black Drift wheels,BMR lower control arms, Brembo big brakes up front,Stainless steel brake lines, JMS Pedalmax.
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post #5 of 6 (permalink) Old 08-14-2017 Thread Starter
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Gears gears gears gonna get a new ring and pinion!



2011 GT/ California Special, Silver, Auto, 3:15's, Airaid race CAI, Hypertech tune, Roush axlebacks and lowering springs, Boss 302 splitter, SR front and rear swaybars, 19x9.5 SVE gloss black Drift wheels,BMR lower control arms, Brembo big brakes up front,Stainless steel brake lines, JMS Pedalmax.
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post #6 of 6 (permalink) Old 08-14-2017 Thread Starter
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Quote:
Originally Posted by noldevin View Post
The automatic does best with the stock 315s, or at most, 331s. Your first gear is too short for anything more.
Any increase in gear will increase your cruising rpm.
The auto has a 6th ratio of .69, so with 3.73s your car would be about 2400 if you have a stock height (27") tire. With 3.55s you'd be at about 2300.
The tires on my 19" wheels have an inflated diameter of 27.7 " tall.



2011 GT/ California Special, Silver, Auto, 3:15's, Airaid race CAI, Hypertech tune, Roush axlebacks and lowering springs, Boss 302 splitter, SR front and rear swaybars, 19x9.5 SVE gloss black Drift wheels,BMR lower control arms, Brembo big brakes up front,Stainless steel brake lines, JMS Pedalmax.
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