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  #1  
Old 08-15-2016, 11:29 AM
ShiftyDT ShiftyDT is offline
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Default 8 Speed Trans with 34" tires

Hey guys.

Looking for some input from people that have installed 34's (275/65R20) on a 1500 with the hemi and the 8 speed.

How does the truck shift after? Can you get it into 8th @ 110 kmh still?

Can the dealer do anything as far as correcting speed and shift points with bigger tires?

Thanks.
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Old 08-15-2016, 08:28 PM
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Depends on the gear ratio, I'd think. Dealer should be able to flash computer for speed adjustment, or get a tuner and do it yourself. I'd suspect 3:92's you'll hardly notice any difference, 3:23's would be much bigger change.
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Old 08-16-2016, 09:20 PM
Tokyo Torquer Tokyo Torquer is offline
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a 1/2" increase in radius on an already tall wheel will not make much of a difference.
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Old 08-17-2016, 12:13 AM
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Quote:
Originally Posted by ShiftyDT View Post
Hey guys.

Looking for some input from people that have installed 34's (275/65R20) on a 1500 with the hemi and the 8 speed.

How does the truck shift after? Can you get it into 8th @ 110 kmh still?

Can the dealer do anything as far as correcting speed and shift points with bigger tires?

Thanks.
I'm running 34" KO2s with the Hemi/8 spd combo. My truck gets to and stays in 8th just fine on the highway (unless I'm climbing a grade).

I asked the dealer about a flash and they just pointed me to the aftermarket controllers. I haven't felt the need to go there. Truck runs great.
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Old 08-17-2016, 07:16 PM
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I have noticed no difference over stock. Just that 107km on yhe speedo is actually 110km due to the wheel size increase
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Old 08-18-2016, 11:46 AM
ShiftyDT ShiftyDT is offline
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Thanks for the info guys. I have the struts shocks and rear coil spacers. Going to install on the 10th and wear the factory SRA's until winter. Then I'll get a set of Open Country AT2's. Hopefully by spring I can afford some Fuel Mavericks to finish 'er off.
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Old 08-18-2016, 09:05 PM
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What do you guys do for a Spare? Factopry spare is only 33", woud, not be good to have it one side and a 34" tire on teh other,


Been wondering wht guys do about that size difference.

thanks
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Old 08-19-2016, 05:58 PM
ShiftyDT ShiftyDT is offline
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A 34" tire should fit in the spare tire carrier still.
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Old 08-20-2016, 06:53 PM
gofishn gofishn is offline
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Quote:
Originally Posted by ShiftyDT View Post
A 34" tire should fit in the spare tire carrier still.
so, just pick up a cheap used steel rim and slap a 34" on it, for a spare?
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Old 08-22-2016, 12:14 PM
ShiftyDT ShiftyDT is offline
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Why not swap out the 33" spare tire for a 34" spare tire on the rim that's already provided under the truck?
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