Which Tires to RUn: Newer 39.5s or worn 44s? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 09-09-2009, 10:03 PM   #1 (permalink)
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Which Tires to RUn: Newer 39.5s or worn 44s?

Here is my rig. An 84 CJ-7 with a mild SBC 350, T-176, D300, D60/FF14. I'm wanting to enter our next mud bog. Question is:

Run the 39.5s that are on it. Pretty good tread left or swap on my worn out 19.5x44x15s?

More tread on the 39s = Good
Taller tire of the 44s = Good.

Also, what about tire pressure. I usually run <10 psi on the trails/rocks (beadlocks). What is better for the mud? Thanks.


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Old 09-10-2009, 04:33 AM   #2 (permalink)
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run the 39.5's, you won't the power the make the 44's work and be competitive, that is if you're area is anything like mine.
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Old 09-10-2009, 06:28 AM   #3 (permalink)
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Run the newer tires. Big, fat, bald tires aren't going to be of much use.
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Old 09-10-2009, 10:30 AM   #4 (permalink)
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Both replies sound logical.
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Old 09-10-2009, 11:05 AM   #5 (permalink)
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What kind of mud do you have around there? Clearance is always good but wheel speed is the key to keep the tires cleaned out if it is thick mud.
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Old 09-10-2009, 11:15 AM   #6 (permalink)
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how worn out are the 44s? it depends on how thick the mud is and how light your rig is... it takes alot of HP to make the tires pull without sinkin you... where are you from?
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Old 09-10-2009, 11:56 AM   #7 (permalink)
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With the D60 front and FF14 rear, the Jeep is heavier than most Jeeps. The land was recently cleared just for this event. I don't really know much about different types of mud, but the dirt is kind of a fine silt. With water added in, its fairly thick. This is up on the North Shore of Oahu. The 44s are mainly worn in the middle, maybe 1/4" tread left in the very middle, the middle and outter lugs are fine. Here is a 3 min. video showing the mud.


http://s7.photobucket.com/albums/y28...eiwaMudBog.flv

Last edited by roadwarriorsvt; 09-10-2009 at 12:13 PM.
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Old 09-10-2009, 12:07 PM   #8 (permalink)
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id run the 39.5s... 10psi is about good... just try to get the wheelspeed up and try to get on top
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Old 09-10-2009, 12:17 PM   #9 (permalink)
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Yea, I'm thinking the 350 will spin the 39s alot faster than the 44s.

Is 1st gear a given or run in whatever gear you can keep them spinning? (5.38 R&P gears)
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Old 09-10-2009, 12:32 PM   #10 (permalink)
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ahhh this is why i like automatics... gotta get the wheel speed up... that all depends on the HP of the engine and the gooyness of the mud... if you get 2 chances id try to leave in 2nd and try to get em spinnin.. if that dont work... prolly gonna have to stay in 1st.. usually tryin to change gears in a situation like that is a downward spiral
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Old 09-10-2009, 01:41 PM   #11 (permalink)
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Without question run the 39s.
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Old 09-10-2009, 05:12 PM   #12 (permalink)
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If you were to run the 44s you could groove them. You would be better off with the 39s though if you can't get those 44s spinning
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Old 09-10-2009, 06:41 PM   #13 (permalink)
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Thanks for all the info guys!
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Old 09-11-2009, 06:41 AM   #14 (permalink)
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If you run the 44's real low on pressure the side lugs will bite in more. Shouldn't have that much problem turning half bald tires....you'll have two more inches of clearance too.
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Old 09-11-2009, 10:42 AM   #15 (permalink)
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Thats true. Good point. I'm looking for some old rims to mount the 44s on, then I'm gonna see if I can access the mud pit and make a run with both. If that doesn't pan out, I'll stick with the 39s.
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