35x12.5x15 and 3.21? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 18 Old 02-06-2012, 09:56 PM Thread Starter
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35x12.5x15 and 3.21?

How bad are we talking about here with a manual tranny? Did you eventually re-gear or just drive your JK like a 5 speed?
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post #2 of 18 Old 02-06-2012, 09:57 PM
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According to a chart floating around on here at 70mph in 6th gear youll be turning around 1800RPMs. There are plenty of people doing it and I will be doing it soon enough. Itll suck hard and probably only drive like a 5speed pig but until I have the coin to regear itll be fine.

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post #3 of 18 Old 02-06-2012, 10:01 PM
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Originally Posted by RookieJK View Post
According to a chart floating around on here at 70mph in 6th gear youll be turning around 1800RPMs. There are plenty of people doing it and I will be doing it soon enough. Itll suck hard and probably only drive like a 5speed pig but until I have the coin to regear itll be fine.
This.

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post #4 of 18 Old 02-06-2012, 11:36 PM
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It is possible but DO NOT try and tow anything.

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post #5 of 18 Old 02-06-2012, 11:41 PM
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It is possible but DO NOT try and tow anything.
Towing, understandable, but what about pulling out stuck friends? If its in 4LO it has a better gear ratio than right?

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post #6 of 18 Old 02-07-2012, 05:46 AM
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I have this set up but with a 17" wheel. I haven't had any problems but u will have to drive it like a 5 spd 6th is useless unless your on a very flat road. I'm hoping to go to 4.10 gears soon

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post #7 of 18 Old 02-07-2012, 05:54 AM
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Quote:
Originally Posted by RookieJK View Post
According to a chart floating around on here at 70mph in 6th gear youll be turning around 1800RPMs. There are plenty of people doing it and I will be doing it soon enough. Itll suck hard and probably only drive like a 5speed pig but until I have the coin to regear itll be fine.
Mine doesn't pull worth a crap at 1800rpm, I'd consider that to setup to be useless in 6th at 70. It'd take a bit more speed imo to get it to maintain speed in 6th.

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Towing, understandable, but what about pulling out stuck friends? If its in 4LO it has a better gear ratio than right?
...not a whole lot better at that point. I'd put minimal load on the clutch if I was geared like that.

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Originally Posted by DeReK_AgIn View Post
I have this set up but with a 17" wheel. I haven't had any problems but u will have to drive it like a 5 spd 6th is useless unless your on a very flat road. I'm hoping to go to 4.10 gears soon

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I wouldn't suggest regearing TO a 4.10, unless it was completely free or something. A 4.56 would be a perfect road gear with 35s and a 6speed. Not the absolute best off road, but that's up to you.

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Last edited by Goodysgotacuda; 02-07-2012 at 05:23 PM.
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post #8 of 18 Old 02-07-2012, 11:59 AM Thread Starter
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The crawling ratio and feel is something I'm concerned with but I only off road about 2-3 times every couple of months. I can crawl with my set up and have not noticed any downgrade in performance with 33x12.5x15s and my 3.21s. I only run in 4LO off road so that I don't have to use my clutch as much.

I've only had an opportunity to speak with a few people who are running 35x12.5x15 and stock 3.21s and they have said about the same thing regarding power and the use of the 6th gear. Truthfully, I don't use 6th now much with my 33s so I imagined I wouldn't be able to at all really with 35s. I guess I'm hoping to take a little hit but nothing significant with the move since I'd only be going up a little in both weight and diameter than where I am currently. I am getting 17.8 mpg in the city and close to 19 on the highway "calculated gallons used vs miles driven" at the pump not the ECO read. Where do you all think that number will be with the new set without changing gears?
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post #9 of 18 Old 02-07-2012, 12:52 PM
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I ran 35s on 17s for almost a year. Sixth gear (lack of) was really the only issue for me. Do it then save some money for gears as you go. No idea about gas mileage since I don't ever check what it is.

Is this thing on?.....

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post #10 of 18 Old 02-07-2012, 01:22 PM Thread Starter
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Originally Posted by Fklein6768 View Post
I ran 35s on 17s for almost a year. Sixth gear (lack of) was really the only issue for me. Do it then save some money for gears as you go. No idea about gas mileage since I don't ever check what it is.

Is this thing on?.....
35s on 17s are some seriously heavy tires for sure. The funny thing is that most jeepers who say they no longer check their mpg are either scared too or they know it's bad and their in denial j/k. I think I'm trying to see in the best way the tipping point to run 35s and what would happen since I'm choosing to do so with the lightest set up of them out there. I don't care about 6th gear. I don't think I even used it with the stock 255s back when I bought the jeep. I guess I don't think too much about it because every jeep I've owned hasn't had one.
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post #11 of 18 Old 02-07-2012, 01:37 PM
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I bought mine new with 3.21s and 35s...ran that way a little over 4 months...wheeled it twice during that time. It's doable, almost tolerable, but you'll eventually want to regear. I went with 4.88s.

As for mileage, I was getting 15 mpg on average before the gear swap and 14 mpg average since I regeared.

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post #12 of 18 Old 02-07-2012, 02:11 PM
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I get about 12 mpg in town and about 15 hwy

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post #13 of 18 Old 02-07-2012, 02:54 PM
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I get about 12 mpg in town and about 15 hwy

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Auto right? Manual u have more controls of the gears.

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post #14 of 18 Old 02-07-2012, 02:59 PM
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i had 37'swith an auto 373 and it was drivable.

this shits all subjective.


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post #15 of 18 Old 02-07-2012, 05:13 PM
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I'll 2nd whoever it was above that said NOT to regear TO 4.10 'cause it's a waste of money (unless it's free).

Go with at LEAST a 4.56, preferably a 4.88. You'll thank yourself (and us) for it after it's done.


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post #16 of 18 Old 02-07-2012, 05:19 PM
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i had 37'swith an auto 373 and it was drivable.

this shits all subjective.
exactly. get the 35s. see how you think it is, then regear when you can.
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post #17 of 18 Old 02-09-2012, 06:39 AM
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I re-geared from 3.21 to 4.10 as I got the gears for free with the purchase of carriers - break is 3.73 so need them for any re-gear. Labor was free (OK case of beer) from my brother-in-law.

I am happy with this set-up 35x12.5x15 KM2's (run ~ 34") in the mountains of Northern New Mexico elevation 6800 - 8000 ft. I would have, and may still go to 4.88 and 37's in the future.

I get ~ 16-18 MPG, but don't do over 65MPH much. I do use 6th gear, but not up-hill.

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post #18 of 18 Old 03-01-2012, 06:57 PM Thread Starter
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Originally Posted by babiehughie View Post
I re-geared from 3.21 to 4.10 as I got the gears for free with the purchase of carriers - break is 3.73 so need them for any re-gear. Labor was free (OK case of beer) from my brother-in-law.

I am happy with this set-up 35x12.5x15 KM2's (run ~ 34") in the mountains of Northern New Mexico elevation 6800 - 8000 ft. I would have, and may still go to 4.88 and 37's in the future.

I get ~ 16-18 MPG, but don't do over 65MPH much. I do use 6th gear, but not up-hill.
I have heard several times that the KM2s mount small. I guess it doesn't matter much to me because I'd be moving up from 33x12.5R15 so any 35x12.5R15 would be a substantial difference in size.
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