Got 4.56 gears in! The good and the bad.
09-29-2017, 04:46 PM
#11
Senior Member
No, sorry. The lower gears in the 6 are way lower. First gear in the 6 is below 4:1. Second gear in the 6 is very close to first in the 4. The top gears are nearly identical. The 4sp has a top gear of .7 and the 6sp is .68.
09-29-2017, 05:01 PM
#12
Senior Member
I have roughly a 34 inch tall tire and want to change from 3.31 to 3.73. My fear is 4.10 gears would be a bad choice with the 6 speed auto trans. I'm afraid the first two gears will shift so quick it would yield them almost useless.
How is your truck from a stop? Does it shift more like it should with a factory tire?
How is your truck from a stop? Does it shift more like it should with a factory tire?
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RTM (09-29-2017)
09-29-2017, 05:10 PM
#13
Senior Member
Thread Starter
You're right on that. I used my programmer to change the axel ratio but I run through gears 1-3 immediately and am in 6 by 40mph. The MPG gains I have heard about are non existent. I requested a tune update from MPT and I'll see how this changes things.
As for the noise, it seems it's been getting quieter the more I drive it. I won't be able to take it back until Monday though.
As for the noise, it seems it's been getting quieter the more I drive it. I won't be able to take it back until Monday though.
09-29-2017, 05:21 PM
#14
Senior Member
Originally Posted by RTM
I have roughly a 34 inch tall tire and want to change from 3.31 to 3.73. My fear is 4.10 gears would be a bad choice with the 6 speed auto trans. I'm afraid the first two gears will shift so quick it would yield them almost useless.
How is your truck from a stop? Does it shift more like it should with a factory tire?
How is your truck from a stop? Does it shift more like it should with a factory tire?
Edit: baseline for 35s
Last edited by WarSurfer; 09-29-2017 at 05:28 PM.
The following users liked this post:
RTM (09-29-2017)
09-29-2017, 09:09 PM
#15
Senior Member
You're right on that. I used my programmer to change the axel ratio but I run through gears 1-3 immediately and am in 6 by 40mph. The MPG gains I have heard about are non existent. I requested a tune update from MPT and I'll see how this changes things.
As for the noise, it seems it's been getting quieter the more I drive it. I won't be able to take it back until Monday though.
As for the noise, it seems it's been getting quieter the more I drive it. I won't be able to take it back until Monday though.
Also, my shop used "calibrating" oil for the rear diff. Had me change it out to normal stuff at around 500 miles.
10-02-2017, 03:27 PM
#17
Senior Member
Thread Starter
Little bit of good news today. Called the installer today and told him off the noise and without hesitation said he would warranty it, order new gears and call me once they arrive.
10-02-2017, 06:58 PM
#19
Senior Member
Thread Starter
Got my MPT tune update with the gears actually written into the tune and the shifting updated. It drives so much better now. Like it should. Only had a short trip so no word on mpg yet.
10-10-2017, 02:44 AM
#20
Senior Member
I have roughly a 34 inch tall tire and want to change from 3.31 to 3.73. My fear is 4.10 gears would be a bad choice with the 6 speed auto trans. I'm afraid the first two gears will shift so quick it would yield them almost useless.
How is your truck from a stop? Does it shift more like it should with a factory tire?
How is your truck from a stop? Does it shift more like it should with a factory tire?
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