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Unread 10-24-2011, 05:45 PM   #1
coupleofjeeps
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3.07 limitations

Well I just got ahold of this 92 wrangler. I've been a GC guy for a long time, never built up a YJ, so I'm excited. Built up a 04 WJ over a few years. Anyway, on to this now...

Finding out from my build sheet that I've got 3.07 runnin the show. PO put a 2.5 rancho, TC drop, lengthened rear ds, and 31's on it. Leafs are nearly inverted, shocks are bad, so I'm thinkin a minor overhaul is in order.

I'd like to run something like OME 2.5, get another inch outa shackles, tj flares, then top it off with 33's. I'm in the Denver area, so I'll wheel a little, but this is a DD, no need to stuff up the fender regularly. Won't see extended highway use, but some.

Question then: What will the gears allow me to do?

Thanks in advance.

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Unread 10-24-2011, 05:52 PM   #2
leftlanetruckin
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Cheapest way is to find some 4 banger axles and swap them out. That will get you 4.10's. You can also get a Ford 8.8 in 4.1o flavor and just the front axle out of the 4 banger. That will set you up for those 33's without an issue. The rear 35 is a weak axle, and not worth spending a dime on when 8.8's are as cheap as they are IMHO
Auto or manual, and assuming it is a 4.0.

Martin
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Unread 10-24-2011, 08:40 PM   #3
Apollo12227
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I recommend changing gears ASAP but they will get you by. Believe it or not I ran 3.07's with 36's for about a year with my tf999 3spd. Now I have a ford 9" 4.56 and the same in the front. Just a word of advice though, go ford 8.8 out of a ford explorer, axle code D2 for 4.10 gearing, and as someone else mentioned grab a d30 off a Craigslist 4cyl YJ as it will be 4.10 as well. You simply won't be happy running larger than stock tires with 3.07's...
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Unread 10-24-2011, 08:45 PM   #4
BigDeaner
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I have 3:07 with 33" tires. Sucks bad, I've only used 5th gear a couple times in the time i've owned the jeep. Bit of an overstatement but if I put it in 5th going down hill I swear i lose speed,lol. I agree with the 4:10's, that's what I've been looking for.
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Unread 10-24-2011, 09:43 PM   #5
jeepyj13
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I run 3.07s with 33" tires on the 4.0 and tf999 for almost a yr. Yeah it sucks but driveable. Need to regear to 4.10s
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Unread 10-24-2011, 10:26 PM   #6
AnonymousD
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I have 35s with 3.07s on my 4.0L and its fine for driving around town. On the highway it will cruse right under 70 MPH easily. I dont get on the interstate much, and if I do it for about 18 miles. I plan on upgrading to an 8.8 with 4.10 gears and a 4 cyl front end eventually.
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Unread 10-24-2011, 11:28 PM   #7
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Quote:
Originally Posted by AnonymousD View Post
I have 35s with 3.07s on my 4.0L and its fine for driving around town. On the highway it will cruse right under 70 MPH easily. I dont get on the interstate much, and if I do it for about 18 miles. I plan on upgrading to an 8.8 with 4.10 gears and a 4 cyl front end eventually.
I agree with the 4.10 and 35's. I had 3.07 and it was completely drivable with 31's but I needed the upgrade to something in the 4 range. If you plan on being offroad more than on, go 4.88. If half and half, 4.56. If it's all flat highway driving go 4.10. If you don't think any of that suits your needs go 4.10 with 4:1 TC. Best of both worlds!
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Unread 10-25-2011, 12:03 AM   #8
tankinyj
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i run 31's on 3.07's. i will be re-gearing to 4.10s when i go SOA and 35's
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Unread 10-25-2011, 05:35 AM   #9
coupleofjeeps
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Quote:
Originally Posted by Apollo12227 View Post
You simply won't be happy running larger than stock tires with 3.07's...
Im not sure I'll ever be happy switching from the 4.7 in my dubj

I am looking long term, as I have little time until summer. Hopefully some stocker yjs with the 4.10 will pop up in the next couple months. Things like that go quick in this area. That should be just a simple plug & play swap, right?
I cant swing the extra $$ just yet for 8.8 swap.
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Unread 10-25-2011, 08:01 AM   #10
jhumphrey
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Quote:
Originally Posted by tankinyj View Post
i run 31's on 3.07's. i will be re-gearing to 4.10s when i go SOA and 35's
If you're planning to go to 35" tires, you'd be a lot happier with 4.56 or 4.88 gears than 4.10s. 4.10s would be to underpowered for 35" tires. Just my .02 worth.

Quote:
Originally Posted by coupleofjeeps View Post
Im not sure I'll ever be happy switching from the 4.7 in my dubj

I am looking long term, as I have little time until summer. Hopefully some stocker yjs with the 4.10 will pop up in the next couple months. Things like that go quick in this area. That should be just a simple plug & play swap, right?
I cant swing the extra $$ just yet for 8.8 swap.
Currently, my jeep has 3.07 gears on 31" tires. Im in the process of swapping my d35 to an 8.8. I wrestled with what gear ratio and done a lot of research:

If you find a dana 30 from a 4 banger with 4.10s, great. In my area, they wanted more for them than what I could buy the r&p and have it installed in my axle for. Keep in mind, you'll need a different carrier (jeep had two for the yj: one for 3.73 and down (numerically) and 3.73 and up). I bought a used carrier off ebay that came complete with spider gears for around $50.

I read that 4.10s with 33" tires will work "ok", but I would suggest going on and doing 4.56s to cover yourself in the event that you want to go to 35" tires in the future. Thats what Im doing. I chose not to go to 4.88s because at that size there is just to little contact with the r&p that if you get the jeep bouncing you can break the r&p....from what I read anyway. Hope that helps. From what you've said, money is tight and I understand (trust me!). Im piecing mine together a part at a time to help costs.

Swapping your d30 with a 4-banger d30 is simple to do. The 8.8 takes some mod work (a lot of it you don't realize until you dive in and start researching). Its the little things that get you (and add costs)
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