6th gear in the 6-speed manual transmission - Ford Mustang Forum
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post #1 of 21 (permalink) Old 10-10-2013 Thread Starter
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6th gear in the 6-speed manual transmission

How many of you hate the 6th gear in the 6-speed manual transmission of your V6 Mustang?

I know it is designed for the gas mileage, but this is the first car that requires me to shift back to the 5th gear, just for an incline on the interstate. Otherwise, I can hear the engine being lugged unhappily. This doesn't make me feel my car is very powerful at all.

Should I consider to replace the 2.73 gears with 3.31 ones just for the sake of my 6th gear?


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post #2 of 21 (permalink) Old 10-10-2013
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Try a 1.4L motor with 6 gears... Going from 6th to 3rd for every little thing gets old pretty fast.


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post #3 of 21 (permalink) Old 10-10-2013
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If you do replace the gear go up to the 3.55:1 at least. Performance improvement is much better. I hate the way the way the auto tranny shifts. It's weird?

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post #4 of 21 (permalink) Old 10-10-2013
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I have 3.31s from the factory and do not have this issue, above 100km/hr I always shift to 6th. I usually drive around 120km/h though and have no problems passing. Minimal sacrifice to fuel economy too, I'm average 10L/100km mainly city. No complaints.

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post #5 of 21 (permalink) Old 10-10-2013
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Quote:
Originally Posted by audioAl View Post
If you do replace the gear go up to the 3.55:1 at least. Performance improvement is much better. I hate the way the way the auto tranny shifts. It's weird?
Why I have heard that the 6R80 is a pretty great tranny.

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post #6 of 21 (permalink) Old 10-10-2013
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Quote:
Originally Posted by Liv4spd View Post
I know it is designed for the gas mileage, but this is the first car that requires me to shift back to the 5th gear, just for an incline on the interstate.
Is it also the first car you've owned with an overdrive ratio? What you're experiencing is the nature of the overdrive beast and happens to some extent with my GT, too ... maybe not QUITE as noticeably, because I have two more cylinders and another hundred horses to call on, but it's still pretty sluggish compared to 5th, which is the 1:1 ratio that you may be used to.

The whole point of an overdrive ratio is to drop the engine RPMs way down to a point where the engine is loafing along, putting out just enough power to maintain a steady cruising speed while returning better fuel economy. You can't fault the powertrain for feeling down on power when the engine is operating at a mechanical disadvantage.

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post #7 of 21 (permalink) Old 10-10-2013 Thread Starter
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The GT comes with 3.31, and most people upgrade it to 3.73. That is a mere 13% icnrease.

V6 comes with 2.73, so 3.31 would be a huge 21% increase already. Isn't 3.55 too much for the RPM at highway speed?




Quote:
Originally Posted by audioAl View Post
If you do replace the gear go up to the 3.55:1 at least. Performance improvement is much better. I hate the way the way the auto tranny shifts. It's weird?

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post #8 of 21 (permalink) Old 10-10-2013
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What kind of hills are you going up on the highway that you feel the need to downshift to be able to climb them?

My '12 V6 manual 2.73 car never had any issues with going uphill in 6th with the cruise set at 65.

And it would lug itself around town in 6th just fine down to 1000 rpm.

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post #9 of 21 (permalink) Old 10-10-2013
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OP: 3.73 fixed this for me, also fixed the "too high first" for aggressive starts too. I think its perfect for this car.
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That's pretty normal on the stock rear end; if you don't like it, just upgrade your gears. With my 3.73s I sit at about 2500 rpm on the highway and my 6R80 never needs to down shift (and I still get 27-28 highway mpg and my city has gone up from 18ish to 20). DON'T FEAR THE GEAR
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Quote:
Originally Posted by Ltngdrvr View Post
What kind of hills are you going up on the highway that you feel the need to downshift to be able to climb them?

My '12 V6 manual 2.73 car never had any issues with going uphill in 6th with the cruise set at 65.

And it would lug itself around town in 6th just fine down to 1000 rpm.
Bingo, same here. 40mph in town? drop that trans into 6th. mine has no issues chugging along at 60-65 on the highway either. and I have some big hills on my commute

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If it's not bucking and shaking it's not lugging. Just because an engine sounds like it's providing power while under load doesn't mean it's lugging.

Lugging usually happens at very low RPM, close to idle and when demanding high power. You'll feel it then. It'll buck like a wild horse. I've never seen any car lug at anything over 1,000 RPM. Even my very low powered MGB will accelerate smoothly uphill at a 1,000 RPM or more.
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I have to say in Texas the 6th gear is fine. That's at 75 MPH. Now if I want to get to 90 MPH i would go to 4th. Coming from a fusion back to a mustang has been great. The fusion also would have shifted from 6th to 4th to make the same move. Yes I'm spoiled as all roads arond here are 70+ outside of town in any direction.

Side note punched the V6 passing today. At 45 MPH I shifted into 2nd, got a 3rd (traction control kicked in) and caught a small tire spin going from 3rd to 4th. Happy has a Camel on hump day.

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When I replaced the stock tires on my base v6, I went down to 215/55R17s. This changed the effective rear gear ratio to about a 2.95, which helped the car a lot. It drives smoother, sixth gear doesn't lug like before, it turns in better and has better feel in the steering. Also it sits a little lower. These tires have stiffer side walls which gives better steering feel and where about $30 cheaper than the stock replacements were. They are V rated to. I know everybody throws a bunch of money at bigger tires and wheel to improve the cars handling, these smaller tire have greatly improved the driveability of the car, it corners flatter and the shifts better spaced.
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I've got the Performance Package (3.55's) and I never have a problem... I love having 6th gear, it helps get the RPM's down to about 2200 on the highway...


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