Which Tires to RUn: Newer 39.5s or worn 44s? - Pirate4x4.Com : 4x4 and Off-Road Forum

roadwarriorsvt · 09-09-2009, 10:03 PM

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.

mustange70 · 09-10-2009, 04:33 AM

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.

TEX · 09-10-2009, 06:28 AM

Run the newer tires. Big, fat, bald tires aren't going to be of much use.

roadwarriorsvt · 09-10-2009, 10:30 AM

Both replies sound logical.

fcduffy76 · 09-10-2009, 11:05 AM

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.

michael brown · 09-10-2009, 11:15 AM

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?

roadwarriorsvt · 09-10-2009, 11:56 AM

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

michael brown · 09-10-2009, 12:07 PM

id run the 39.5s... 10psi is about good... just try to get the wheelspeed up and try to get on top

roadwarriorsvt · 09-10-2009, 12:17 PM

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)

michael brown · 09-10-2009, 12:32 PM

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

Proeliator · 09-10-2009, 01:41 PM

Without question run the 39s.

dfl701 · 09-10-2009, 05:12 PM

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

roadwarriorsvt · 09-10-2009, 06:41 PM

Thanks for all the info guys!

bayouhazard · 09-11-2009, 06:41 AM

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.

roadwarriorsvt · 09-11-2009, 10:42 AM

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.

09-09-2009, 10:03 PM	#1 (permalink)
roadwarriorsvt Registered User Join Date: May 2007 Member # 91009 Location: Wahiawa, HI Posts: 187	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.

09-10-2009, 04:33 AM	#2 (permalink)
mustange70 Registered User Join Date: Jan 2005 Member # 41097 Location: Calgary Posts: 2,109	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. __________________ 90' C350 AKA 4 door 1 ton Bronco 96' Ranger: kings, EMF parts, 800hp SBF

09-10-2009, 06:28 AM	#3 (permalink)
TEX Registered User Join Date: Apr 2000 Member # 603 Location: Missouri, USA Posts: 14,194	Run the newer tires. Big, fat, bald tires aren't going to be of much use. __________________ www.probog.com Thanks to: www.heiseroil.com Extreme Performance www.kmelectronics.com Bear Creek Auto Recyclers www.svrehorsepower.com

09-10-2009, 11:56 AM	#7 (permalink)
roadwarriorsvt Registered User Join Date: May 2007 Member # 91009 Location: Wahiawa, HI Posts: 187	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.

09-10-2009, 01:41 PM	#11 (permalink)
Proeliator Registered User Join Date: May 2002 Member # 12042 Location: a den of iniquity Posts: 7,065	Without question run the 39s. __________________ [QUOTE=94stepsideford;7266691]Seth is scarier than you though. He looks like he would kill and eat a baby with his bare hands.[/QUOTE] '73 F250, 533 on N2o, 35spln chromo Superior/CTM D60/D70, twinsticked 205, hydro-assist, f&r lockers, HAD drivelines, 46" Titan R1s. Vid: [url]http://youtu.be/KaL-IsCWrrI[/url] [url]http://youtu.be/l9cuRoEfCn0[/url]

09-10-2009, 10:30 AM	#4 (permalink)
roadwarriorsvt Registered User Join Date: May 2007 Member # 91009 Location: Wahiawa, HI Posts: 187	Both replies sound logical.

09-10-2009, 11:05 AM	#5 (permalink)
fcduffy76 Registered User Join Date: Sep 2005 Member # 53692 Posts: 57	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.

09-10-2009, 11:15 AM	#6 (permalink)
michael brown Wheeler Join Date: Sep 2009 Member # 141654 Location: madison MS Posts: 493	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?

09-10-2009, 12:07 PM	#8 (permalink)
michael brown Wheeler Join Date: Sep 2009 Member # 141654 Location: madison MS Posts: 493	id run the 39.5s... 10psi is about good... just try to get the wheelspeed up and try to get on top

09-10-2009, 12:17 PM	#9 (permalink)
roadwarriorsvt Registered User Join Date: May 2007 Member # 91009 Location: Wahiawa, HI Posts: 187	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)

09-10-2009, 12:32 PM	#10 (permalink)
michael brown Wheeler Join Date: Sep 2009 Member # 141654 Location: madison MS Posts: 493	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

09-10-2009, 05:12 PM	#12 (permalink)
dfl701 Registered User Join Date: Jan 2009 Member # 126764 Location: Alabama Posts: 434	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 __________________ 83 k5 with typical rust

09-10-2009, 06:41 PM	#13 (permalink)
roadwarriorsvt Registered User Join Date: May 2007 Member # 91009 Location: Wahiawa, HI Posts: 187	Thanks for all the info guys!

09-11-2009, 06:41 AM	#14 (permalink)
bayouhazard Registered User Join Date: Nov 2005 Member # 56696 Location: New Waverlyish, Tx in the sticks Posts: 595	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. __________________ 80 toyota p/u, 4.3 vortec, th350, dual cases, frt/rr 60's, 7.17's, 42 irocs, trail ready's,full hydro

09-11-2009, 10:42 AM	#15 (permalink)
roadwarriorsvt Registered User Join Date: May 2007 Member # 91009 Location: Wahiawa, HI Posts: 187	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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