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Unread 03-01-2012, 11:37 PM   #1
OKRenegade
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Appropriate Tire Size for 4.56 Gears

I was looking for some opinions as to what you guys thought would be the appropriate tire size for me to run.

I recently acquired some new axles, and will be replacing my tires as my current ones are leftover from the previous owner and in bad shape.

The new axles are WideTrac AMC 20 rear and Dana 30 front. Both geared to 4.56 with a Detroit SoftLocker in the rear and a Lock-Right in the front. Moser single piece axle shafts in the rear and Superwinch hubs up front.

The Jeep itself is an 1984 CJ7 with the Inline 6 258, transmission is the T-176, and it has the Dana 300 Transfer case. It currently is set up with 6" of suspension lift and no body or shackle lift.

My planned usage is to trailer it to off roading spots on average one weekend a month, for both days and would like to be able to give a whirl at some level 4 trails. I would also like to drive it to work when the weather is nice and around town, etc.

In the research I have done it looks like to fit 35's comfortably most people recommend cutting out the fenders. I am not willing to do this at the moment, though I understand this is the easiest way to go. Would adding larger bumpstops to limit up travel be an option if 35's are chosen? Is there some other means to achieve enough lift to fit 35's. ie an inch of shackle lift, or an inch/inch and a half of body lift? Also will the 35's place to much stress on the Dana 30 up front? I know Lock-Right only warranties their product up to 33's has anyone had problems with this?

I'm not against running 33's However my concern is that the clearance is obviously 1" less, also my RPMs on the pavement will be higher for a given speed, even more so with the 4.56 gearing. I am inclined to the 35s, probably looking at the BF Goodrich Mud terrains in 35 12.5 r15, though in 33's i would be considering the same tire in 33 12.5 r15.

If you guys have and advice or opinions I'd appreciate it. Please let me know if you need any other information about my set up.

Thank You!
PB

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Unread 03-01-2012, 11:45 PM   #2
BagusJeep
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Sounds like a good start for a weekend toy, 4.56 gears and 6" of lift and one piece axles. Your RPMs on pavement may not be such an issue as you will not be doing very much on road by the sounds of it.

33s or 35s would work well with this combination.

One comment I would have is that you have a lot of lift, far more than you need for these size tyres and you could fit 37s with that much lift but I would not recommend it on an AMC20. This by itself is probably not an issue but you need to have a good look at the driveshaft angles and the steering / tie rods etc to make it work.

Just remember, the best reason to lift is to get taller rubber underneath and lift those axles up.

33s will fit without any other mods as you have so much lift I would be surprised if they touched, 35s you need to have a look at other rigs on this site with 6" lifts and 35s or 37s and whether they have had to cut or had rubbing issues.

With 35s you are on the limits for an AMC20 with one piece axles, you may want to consider welding the axle tubes to the diff and even a truss to hold it all square.

Do not try to limit the axle articulation, you will need as much as you can get with cart spring suspension when you are on tough trails.

This is the usual guide to gearing for on road 60mph 4th gear:
gear4.gif  
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Unread 03-01-2012, 11:57 PM   #3
mopar346
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My concern would be 35's on the 30 with any amount of thrashing. Street driving no issue, but I have heard they don't like tires that big.
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Unread 03-02-2012, 12:01 AM   #4
mulliflier
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I have about 4" total lift, and run 33x12.50's with no issues whatsoever. 4.56 gear as well, and with a SM465 tranny, so my gearing is pretty low. Can still drive it on the street, but it doesn't sip fuel.

IMHO, the 35's are mroe trouble than they are worth for just 1" of add'l ground clearance. I have never had my CJ stuck, and I built my CJ specifically for L4 trails like you described (although I've only hit a few that are a legit 4, still breaking her in!)

Good luck with the decision!
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Unread 03-02-2012, 12:12 AM   #5
CJ7Sasquatch
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I'll agree, 35's are more trouble than there worth "to me" for the minimal gain in height. I run 33's with 4.56 gears with T150 three speed just fine
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Unread 03-05-2012, 11:59 PM   #6
OKRenegade
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Thanks for the replys, I haven't made a final decision yet, but am leaning towards the 33's due to the added stresses placed on the Dana 30 as well as the need it seems to cut the fender a bit to get them to fit when the springs start to flex. I am looking at doing a Dana 44 front at some point in the distant future so I may tie 35's into that modification when/if it happens.

As far as 33's go I am looking at the BF Goodrich Mud Terrain KM2s. I was thinking in either 33 12.5 R15, or 33 10.5 R15. I was thinking of doing the 12.5 on 10" wheels and the 10.5 on an 8" wheel. Any thoughts or suggestions on either set up? Thanks again. Attached is a pic of my Jeep currently. I have another post up asking if people thought I actually have a 6" lift. This is just what the PO told me. If I go to 33's I'd like to run a 4" lift. Here is the link if you are interested: http://www.jeepforum.com/forum/f8/ho...-have-1338831/
jeep-lift-question-2.jpg  
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Unread 03-06-2012, 01:31 AM   #7
Always2L8
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Bagus,

I believe the gearing chart in your post above is for 55 mph instead of 60. I'm not trying to pick nits, just thought you may want to know FYI.
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Unread 03-06-2012, 02:37 AM   #8
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Yea I'm running 10 inch wheels with a 3.50 back spacing with the BFG km2 MUDs and stuff em nice. I dont think you can go wrong with the BFG MUDs . In my OP if ya get stuck with 33's ya ought not be there, but my aggressive hardcore days are over
image-3011751036.jpg  
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Unread 03-06-2012, 07:19 AM   #9
lucdog
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Level 4 trails, Dana 30 with a lockrite, factory axle shafts?

33/12.50's, 8" rim,

Bill
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1979 CJ7 360, TH400/Quadratrac trail Jeep.
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1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
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Unread 03-06-2012, 08:57 AM   #10
OKRenegade
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Bill, any reason for the 8" wheel over a 10" wheel? I assume it has to do with actual tread width in relation to the wheel thickness?

And why do you favor the 12.5 over the 10.5 tire? Thanks

Last edited by OKRenegade; 03-06-2012 at 08:59 AM.. Reason: Forgot to ask all questions.
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Unread 03-06-2012, 01:29 PM   #11
lucdog
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Quote:
Originally Posted by OKRenegade
Bill, any reason for the 8" wheel over a 10" wheel? I assume it has to do with actual tread width in relation to the wheel thickness?

And why do you favor the 12.5 over the 10.5 tire? Thanks
I feel at low air pressures the wider tire will give more contact patch. Plus they look cooler.

I actually should have said 8" or 10" rim. Either is acceptable, but it depends on the tire. A 12.50 width differs from tire to tire. It seems to me the BFG's ( 3rd picture) are not quite as wide (tread width) as the first 2 pictures.

The first 2 pictures are 33/12.50/15 on 10" rims.
The 3rd is a 35/12.50/15 on a 8".
It really depends on the look you want.
Some will say they would rather use a 8" rim so the tire protects the rim, I would rather have the rim protect the sidewall of the tire. I would rather scratch some paint than puncture a tire.

The last picture is a 31/11.50/ 15 on a 10" rim, for comparison.
The tread width is 9", the 35/12.50 width is 9 5/8"
The tire in the 1st picture, a 33/12.50 is 10"
The key here is what I should have said. So I apologize for that.
Bill
forumrunner_20120306_124654.jpg   forumrunner_20120306_124801.jpg   forumrunner_20120306_125118.jpg   forumrunner_20120306_131624.jpg  
__________________
1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 03-07-2012, 10:10 PM   #12
OKRenegade
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Thanks a lot for the pictures Lucdog, very helpful. I am looking at going for the BF Goodrich Mud Terrain KM2s in 33x12.5xR15.

I find it very interesting that everyone is split down the middle on this. Half the people Ive talked to say go 35 or I'll regret it, the other half say go 33 or I'll regret it. Does seem like most of the people who say 33s are people with CJs and people who say go 35s have JKs or TJs.
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Unread 03-07-2012, 10:33 PM   #13
spottedfrog
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I'd say 33's Ive run them on YJ's TJ's and hope to on my CJ. If I were going to do the kind of work needed to run 35's I don't think I'd want to stop there.
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Unread 03-07-2012, 11:05 PM   #14
lucdog
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I'm saying 33's because of the Dana 30. The Jeep with the 35's is now mainly a street Jeep. When I do take it on trails I run 33's, because of only 3.5" of lift. Its not a mall crawler by any means (Detroit rear with Moser axle shafts, trutrac front with warn axle shafts. On 20 and 30 axles, and 4.56 gears) My wife said it was two nice for trails, after I finished it. I then built a CJ 5, and a 7 for trail use. Both of those are or will be ( the blue CJ7) useing the same 36" IROC's on Dana 44's.

The first picture is the street 7 with the 35's, 2.5" spring lift, 1" body lift, and SUA.
The second is the trail 7 with 33/13.50/15 LTB's, in the very near future it will have the 36" IROC's. Full width axles, 3" SUA, with the body cut to fit.
I don't have a picture of the 5 on my phone. Its a SOA.

Bill
forumrunner_20120307_225917.jpg   forumrunner_20120307_225950.jpg   010.jpg   017.jpg  
__________________
1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 03-07-2012, 11:45 PM   #15
CJ7Sasquatch
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I ran 35's originally and didn't like em, the 33's are much bettering my op, plus a bit easier in the 30. Here's another if the back stuff with 33's. Keep in mind the two pics ive put up are not completely flexed out, I wanted to be able to climb back in the jeep since I was by myself
image-3369109384.jpg   image-3930626362.jpg  
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Axle gear ratio , lift and tire combination , tire size

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