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Old 10-17-2011, 10:49 PM   #1
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35's 3.73's and 6 spd

Anyone running 35's with 3.73's and six speed w/ the 3.8L engine? How is the mpg and performance?

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Old 10-17-2011, 10:50 PM   #2
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Quote:
Originally Posted by ChaseRedJK
Anyone running 35's with 3.73's and six speed w/ the 3.8L engine? How is the mpg and performance?
I heard 4.10'a are "livable" 3.73's would assume not to great.

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Old 10-17-2011, 11:03 PM   #3
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Considering going from a MT tire with steel wheel to a 35 inch all terrain with aluminum wheel.. Im thinkin itll be a wash.
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Old 10-18-2011, 05:23 AM   #4
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That is currently my exact setup.

The 3.73s are serviceable in town as a DD. On the highway - if it's flat, 6th gear is fine (~2400rpm at ~ 80 mph), just don't expect a quick passing exeperience without downshifting to 5th. ANY hill or incline will require a downshift.

I mostly get her muddy, so no problems off road. The few hills I've run haven't posed a problem.

I get ~16mpg in town, ~17mpg in 6th gear on flat highways (if it's a hilly trip, I usually just leave it in 5th, this is right at 3000rpm at 75mph, and mpg drops to 13-14).

So, from my experience, 3.73s with a manual trans and 35s are serviceable, but only under the right conditions and use. I wouldn't want to drive from Denver to Grand Junction with my current setup...

Once the warranty expires, I plan on going to 4.88s or 5.13s.
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Old 10-18-2011, 08:18 AM   #5
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Thanks for the info man! My Jeep with 33's and steel wheels doesn't require downshifting at all. I kind of expected it to be about the same with 35" all terrains and aluminum wheels. Is yours a four door?
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Old 10-19-2011, 06:41 AM   #6
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Thanks for the info man! My Jeep with 33's and steel wheels doesn't require downshifting at all. I kind of expected it to be about the same with 35" all terrains and aluminum wheels. Is yours a four door?
Yes, she's an Unlimited Sport, soft top only. 17" MT Classics and 315 MTZs. They are pretty darned heavy (~90lbs on each corner, and one hanging off the tailgate). She also wears the Mopar steel front and rear bumpers, so I guess that's an extra 60 lbs or so (as compared to the stock bumpers).

So she definitely weighs a bit more than when she rolled off the factory assembly line. Perhaps that's why she has a hard time maintaining speed up an incline in 6th...
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Old 10-19-2011, 07:35 AM   #7
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I heard 4.10'a are "livable" 3.73's would assume not to great.
i'm living that right now - lol
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Old 10-19-2011, 07:36 AM   #8
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Quote:
Originally Posted by ChaseRedJK
Thanks for the info man! My Jeep with 33's and steel wheels doesn't require downshifting at all. I kind of expected it to be about the same with 35" all terrains and aluminum wheels. Is yours a four door?
Weight has little to do with it, but mainly the size of the tire does. Don't expect that your changing tire style and rim style that it will negate those 2 extra inches, because it wont at all.
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Old 10-19-2011, 09:03 AM   #9
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Originally Posted by MikeMTJ

Weight has little to do with it, but mainly the size of the tire does. Don't expect that your changing tire style and rim style that it will negate those 2 extra inches, because it wont at all.
Is doesn't?
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Old 10-19-2011, 09:04 AM   #10
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i'm living that right now - lol
And there we have it haha
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Old 10-20-2011, 11:56 AM   #11
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Weight has little to do with it, but mainly the size of the tire does. Don't expect that your changing tire style and rim style that it will negate those 2 extra inches, because it wont at all.

I just assumed so because the rolling resistance will be less with an AT tire and the light wheel I thought help compensate for the the tire size. I expect My tire/wheel weight will be the same with less rolling resistance and as long as I change my shift points to compensate I assumed the only change I would see would be little less torque.
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Old 10-20-2011, 12:05 PM   #12
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Weight has little to do with it, but mainly the size of the tire does. Don't expect that your changing tire style and rim style that it will negate those 2 extra inches, because it wont at all.
Not sure were you got that from but weight is a major concern. Yes size matters also but weight adds to the equations. JP magazine just did a article on this and weight was the major concern. Put a baseball on a string and spin it then get a ball bearing the same size and try to spin it and tell me weight doesn't matter. It mainly concerns the initial movement. The weight makes it more difficult to start the tire moving. But since a vehicle never stays at a constant speed because of friction, you are constantly having to move the extra weight forward.
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Old 10-20-2011, 01:02 PM   #13
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you are basicly go from a 3.73 to like a 3.21 effective axle ratio when going to the 35" tires.
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Old 10-20-2011, 01:05 PM   #14
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you are basicly go from a 3.73 to like a 3.21 effective axle ratio when going to the 35" tires.

What am I at now with 33's?
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Old 10-20-2011, 09:50 PM   #15
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Below is a link to a website that can give an idea as to what the change in gear ratio will be when going to a different size tire. Just key in the new tire size vs. the old tire size and then the gear ratio that you now have and hit calculate and it will show what the gear ratio changed to.

However, this does not take in conderation for the added weight and drag cause by the larger tires.

Gears Needed After Adding Larger Tires
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Old 10-20-2011, 10:53 PM   #16
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Below is a link to a website that can give an idea as to what the change in gear ratio will be when going to a different size tire. Just key in the new tire size vs. the old tire size and then the gear ratio that you now have and hit calculate and it will show what the gear ratio changed to.

However, this does not take in conderation for the added weight and drag cause by the larger tires.

Gears Needed After Adding Larger Tires

greatly appreciated!

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