Any side effect to not regearing after big tires (35's)?
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Senior Member
Joined: Jul 2000
Posts: 222
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From: Beaumont, TX
Any side effect to not regearing after big tires (35's)?
Just got my 35's on and I'm wondering if there are any side effects besides worse gas mileage and powerloss (i.e., damage to transmission and/or engine?)
Senior Member
Joined: Mar 2001
Posts: 4,506
Likes: 6
From: Puyallup, WA
Maybe just extra "wear" and heat on the tranny fluid. It will be slipping more, since it has a different "ratio" to work with. I'm not sure what the actual difference in height is from the 315's to the actual "35's", but can't be too much of a difference. Dunno.
I've noticed that these numbers tend to be a bit higher then the actual tire height. I only know from my experience. My 265/75 "calculates" to 31.6", but the actual height measured using a level at the top of the tire to the ground is only 31". Now, some of the difference may be due to the fact that the tire has a load on it too. Dunno that either. I have not measured them off the truck......
I've noticed that these numbers tend to be a bit higher then the actual tire height. I only know from my experience. My 265/75 "calculates" to 31.6", but the actual height measured using a level at the top of the tire to the ground is only 31". Now, some of the difference may be due to the fact that the tire has a load on it too. Dunno that either. I have not measured them off the truck......
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Joined: Jul 2001
Posts: 42
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Tire Terror
ANY TIME you increase tire size you increase load. Period. You increase the following directly:
Rotational Mass
Proportional load to the diff which affects:
All your U-Joints
All your bearings, up to the tranny (or transfer case)
Going with a lower gear ratio only makes it -seem- less apparent in the low end, you still have loss in the high end. You're trying to compensate for the extra effort required to swing larger tires, not eliminate it. You can't do that.
On the other hand, the -150 is a tough-as-nails rig. It can certainly take quite a bit of punishment. Also, you can swap U-Joints pretty quick. Bearings take longer, but you can do them yourself too (if you have to, and you will if you keep the truck).
If you lift, remember to correct for the axle angles being different. Thats a killer.
BTW, tires are measured, tread to tread when inflated on a mount, not when loaded.
Just keep in mind, that wider, taller, and or heavier means more friction for your truck's drivetrain to overcome. It also means the ability to grip more and have more fun. The balance is entirely up to you and your checkbook. Have fun with your -150
Rotational Mass
Proportional load to the diff which affects:
All your U-Joints
All your bearings, up to the tranny (or transfer case)
Going with a lower gear ratio only makes it -seem- less apparent in the low end, you still have loss in the high end. You're trying to compensate for the extra effort required to swing larger tires, not eliminate it. You can't do that.
On the other hand, the -150 is a tough-as-nails rig. It can certainly take quite a bit of punishment. Also, you can swap U-Joints pretty quick. Bearings take longer, but you can do them yourself too (if you have to, and you will if you keep the truck).
If you lift, remember to correct for the axle angles being different. Thats a killer.
BTW, tires are measured, tread to tread when inflated on a mount, not when loaded.
Just keep in mind, that wider, taller, and or heavier means more friction for your truck's drivetrain to overcome. It also means the ability to grip more and have more fun. The balance is entirely up to you and your checkbook. Have fun with your -150
