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Old 05-24-2015, 05:14 AM   #1
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LT Tire Warning !

As asked in a previous post, i need 2 new rear tires on my Dodge 1500 5.7 and after mixed input from the forum i decided on LT E rated tires for the back,P left on the front ( still plenty of tread )thinking higher load rating and possible better sway control with the stiffer sidewalls, and this is what i learned the hard way !!!!

DO NOT MIX LT AND P TIRES !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!

A once great handling truck is now all over the road, it's like the front and rear axles are in different time zones as far as steering input and recovery. So i guess two more LT's for the front are the only answer, can't see going back to P's and trying to unload the LT's

Just wanted to post this so others learn from my stupidity!!!
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Old 05-24-2015, 05:41 AM   #2
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Yes, that would cause problems. A good rule of thumb is all axles should have the same type I.E. LT or P.
The axle set front or rear should also have the same tread/size on them.
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Old 05-24-2015, 09:03 PM   #3
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I reread your original thread (I think). There really was no mention of mixing 'P' with 'LT' tires. Just if 'LT' tires would feel better when towing.

But thanks...this is good to know because I would have thought like you. As long as on the same axle it would work.
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Old 05-24-2015, 10:25 PM   #4
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There can be more going on other than mixing the two.

I've mounted new P tires on the back with older P tires on the front and messed up handling.

Tread pattern differences.

New tires require a break in period for good handling so if you decide to mount two on the front you may not fix the problem. I see quite a few complain about handling issues after installing new tires on all sizes of trucks.
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Old 05-24-2015, 10:37 PM   #5
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What pressure are you running for the the Lt on the back and what's pressure are you running on the front p metric?
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Old 05-25-2015, 03:46 AM   #6
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Started off at 45 # as recommended by supplier, thought it was being caused by too low of a pressure, so, up to 65 # and worse !!!
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Old 05-25-2015, 07:52 AM   #7
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When going from p to Lt, you need to increase the pressure by 15psi. Too much pressure is just as dangerous as too little. If your vehicle sticker recommends 35, try 50.
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Old 05-25-2015, 08:24 AM   #8
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Mixing tires is so unpredictable. You just are never quite sure ,until you drive the unit, how compatible they are.

Continentals came on my Winnebago View- they cost more than Michelins- I put the new spare down & bought a matching Continental (both on front) just to avoid the mix/match scenario.
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Old 05-25-2015, 10:19 PM   #9
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Don't guess on tire pressure. There was a recent thread where the Toyo website was mentioned for inflation pressure. Go there and inflate your tires to the pressure you need for the load you're carrying. Too high and you wear out the center, too low and you wear out the outer sides. Easy to find the proper pressure.
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Old 05-26-2015, 10:04 AM   #10
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Well, I hope problem resolved. Call Discount Tire Direct, whom i purchased tires from, and they confirmed there could be problems mixing Lt & P tires ( which i must say i did not state ) but was informed the tire i purchased was on a no sale list they had just got. They are paying to return them and replacing them with another tire, N/C, i decided to go back to P tires ( not going thru this again) plus the difference in price.

Cudo's to Discount Tires Direct, true i'm going to eat the mounting/ balance i paid , but happy !!!!!
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Old 05-26-2015, 10:14 AM   #11
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PS- Was tempted to go Lt Tires on all four, but $$$$ involved, and fear of results, and needed only 2 tires, back to P's
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Old 05-27-2015, 09:36 PM   #12
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Well, I guess it's too late, but I would be willing to bet you had some junk E tires. How much more do the E tires cost? Can't imagine the incremental amount over Ps is all that much.

The solution to your stability issue would likely have been increasing the front pressures, not rear. Sounds like the new rears' traction were over powering the fronts.
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Old 05-28-2015, 04:55 AM   #13
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The replacement P's are on the way, and you may be correct about problems with the LT's i bought.Since my truck is a daily driver also, and the handling problem they caused,( to the point of being unsafe IMHO ) i'm playing it safe, and staying with the P's. Maybe after retirement and more toward full timing,will rethink it. Thanks
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