35" Tires ~~~> 37" Tires
02-07-2012, 12:21 PM
#1
Member
Thread Starter
35" Tires ~~~> 37" Tires
I have been running 35" tires (45K) with a ProComp Stage II lift for a few years now. I am in the market for new tires. (SERIOUSLY LOOKING) I've heard some stories about jumping to 37s are really bad for the eng/tran, and regearing is a must.
Is there any truth to this, and if so what does regearing entail. I have an '06 FX4, so that means regearing the REAR and FRONT.
Any experince would be greatly appreciated.
Is there any truth to this, and if so what does regearing entail. I have an '06 FX4, so that means regearing the REAR and FRONT.
Any experince would be greatly appreciated.
02-07-2012, 12:41 PM
#2
Seņor Member
Yes regearing is a very good idea when putting on 37s. I just did last month, installed 6" Fabtech and 37" toyo m/t. Also would need a programmer of some type to correct gauges and ECM.
I went from stock to this:
The MPGs dropped from 12-14, to 7! It was horrible. It was like I was pulling a loaded trailer all the time...with the bed loaded down. It was bad.
I took mine to 4WheelParts, great guys here in Portland area. They were the closest will to do the job.
Yes, you have to do front and back if you expect to use your 4wd.
I went to 4.88s at the suggestion of the 4WheelParts manager. I was skeptical, but he was right.
The truck gets up to 17-18 on average, mix of city and highway. Throttle response is awesome with out any programmer tuning. With a power tune running, I can break the tires loose!
Here's a gear chart from quadratec, wanna be in the green.
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You don't HAVE to regear. But the drivability will be unbearable and it's really hard on the transmission.
BTW, the Toyo Open Country M/Ts ride better than I expected. At parking lot speed, I can feel the lugs, but at driving speed they run just fine and I don't notice any noise. I'm not a stereo guy, so I would notice.
Good Luck!
I went from stock to this:
The MPGs dropped from 12-14, to 7! It was horrible. It was like I was pulling a loaded trailer all the time...with the bed loaded down. It was bad.
I took mine to 4WheelParts, great guys here in Portland area. They were the closest will to do the job.
Yes, you have to do front and back if you expect to use your 4wd.
I went to 4.88s at the suggestion of the 4WheelParts manager. I was skeptical, but he was right.
The truck gets up to 17-18 on average, mix of city and highway. Throttle response is awesome with out any programmer tuning. With a power tune running, I can break the tires loose!
Here's a gear chart from quadratec, wanna be in the green.
You don't HAVE to regear. But the drivability will be unbearable and it's really hard on the transmission.
BTW, the Toyo Open Country M/Ts ride better than I expected. At parking lot speed, I can feel the lugs, but at driving speed they run just fine and I don't notice any noise. I'm not a stereo guy, so I would notice.
Good Luck!
02-07-2012, 02:57 PM
#6
Seņor Member
Correct:
"This chart is based on 65 MPH and a gear ratio of 1:1, on a manual transmission in 4th gear. Please NOTE: If you have an automatic transmission your RPM will higher due to slippage in the transmission and the torque converter. With an overdrive transmission your RPM in overdrive will be 15% to 30% less than indicated."
Nonetheless; it's accurate. I since my truck is running 4.88s, with 37" tires, 6" fabtech...I can witness to the fact.
I did state the chart is from Quadratec.