What if... - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 04-25-2009, 02:37 AM Thread Starter
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What if...

What if I ran a 245 tire on one rear wheel and a 315 on the other with the factory posi rear? How many miles could I go without having to rebuild anything else? Or would it even hurt anything else?

I see people do it all the time.
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post #2 of 17 (permalink) Old 04-25-2009, 03:23 AM
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Why would you want to do that? The accelleration, braking, and suspension would all be negatively affected.

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post #3 of 17 (permalink) Old 04-25-2009, 03:28 AM
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Not recomended. And what truck comes with factory posi?


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post #4 of 17 (permalink) Old 04-25-2009, 02:45 PM Thread Starter
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Why would you want to do that? The accelleration, braking, and suspension would all be negatively affected.
It's because I don't want to buy a fullsize spare.
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post #5 of 17 (permalink) Old 04-25-2009, 02:47 PM Thread Starter
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And what truck comes with factory posi?

I ordered it from the factory with the 3.73 posi rear.
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post #6 of 17 (permalink) Old 04-25-2009, 04:04 PM Thread Starter
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Not recomended. And what truck comes with factory posi?
You had me questioning my mental health there for a little bit. I was sure I ordered the posi, maybe? When I broke the ring gear I was pretty sure the eaton G80 was in there.

Just went and checked the RPO codes on the glove box, G80. That's the eaton posi lock, G86 is the limited slip. I guess if I had two different size tires the diff wouldn't be locked.

If I'm just limping home on the highway I should be fine, but what if I'm in the woods on some trail in this situation? I know the G80 is better than it used to be, but how much better?
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post #7 of 17 (permalink) Old 04-25-2009, 05:32 PM
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You had me questioning my mental health there for a little bit. I was sure I ordered the posi, maybe? When I broke the ring gear I was pretty sure the eaton G80 was in there.

Just went and checked the RPO codes on the glove box, G80. That's the eaton posi lock, G86 is the limited slip. I guess if I had two different size tires the diff wouldn't be locked.

If I'm just limping home on the highway I should be fine, but what if I'm in the woods on some trail in this situation? I know the G80 is better than it used to be, but how much better?
The G80 is a Gov Lock rear end. This is a locking rear end, also know as a "locker".

The G86, as you stated, is the limited slip rear end. This is also known as "posi". I dont believe you could order a G86 on a 2500 or a 3500, you could only get the G80.

Anyway, back to your question. In a emergency situation, yes, you could use two different tires sizes. But I would only do this as a last ditch effort. Try to return to the same size tires as soon as possible though.

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post #8 of 17 (permalink) Old 04-25-2009, 05:54 PM
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Move a tire from the front to the rear that is the same as the flat tire, then put the samller spare tire on the front. that way you are not affecting the rear end at all.

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post #9 of 17 (permalink) Old 04-25-2009, 11:33 PM
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Move a tire from the front to the rear that is the same as the flat tire, then put the samller spare tire on the front. that way you are not affecting the rear end at all.


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post #10 of 17 (permalink) Old 04-26-2009, 03:28 AM Thread Starter
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Move a tire from the front to the rear that is the same as the flat tire, then put the samller spare tire on the front. that way you are not affecting the rear end at all.
I've done that before, it sucks to drive.

Apparently eaton calls the limited slip "posi" and the g80 a locker, now I know.

Last edited by mckey73; 04-26-2009 at 03:40 AM.
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