Transmission Problems

[Blu Du]

No that is incorrect.

The transmission will still turn 3000 RPMS at 65 MPH, but with larger wheels they will be turning LESS revolutions per mile.


Say tire x turns 505 revolutions per mile,
and you go to Tire Z which is two sizes larger, they will be turning something like 470 revolutions per mile.


Go get a tape measure.

Measure out say 12 feet.

Get a regular size jar out of the fridge say a Canning Jar.

Now go get a 5-gallon bucket. Roll each of them accross the space you measured out and count how many revolutions it takes to cover the distance. It will be less for the 5 gallon bucket.

both statements are true

 

[moldy]

No that is incorrect.

The transmission will still turn 3000 RPMS at 65 MPH, but with larger wheels they will be turning LESS revolutions per mile.


Say tire x turns 505 revolutions per mile,
and you go to Tire Z which is two sizes larger, they will be turning something like 470 revolutions per mile.


Go get a tape measure.

Measure out say 12 feet.

Get a regular size jar out of the fridge say a Canning Jar.

Now go get a 5-gallon bucket. Roll each of them accross the space you measured out and count how many revolutions it takes to cover the distance. It will be less for the 5 gallon bucket.

I'm not arguing that larger tires don't cover more ground. I totally get that, but there isn't something magic in the truck that tells it to slow the number of wheel revolutions down because it now has larger tires on it. To travel 65 the tires will make less revolutions, because the tires are bigger. However we are talking about tire revolutions versus engine revolutions. The tranny or drivetrain will not just slip to compensate for the larger tires, the wheels will turn a fixed amount of times for the rpm and gear of the truck. So in the same instance you mentioned above the engine will be turning less rpms to travel 65 because of the larger tires.

 

[winter brew]

I'm not arguing that larger tires don't cover more ground. I totally get that, but there isn't something magic in the truck that tells it to slow the number of wheel revolutions down because it now has larger tires on it. To travel 65 the tires will make less revolutions, because the tires are bigger. However we are talking about tire revolutions versus engine revolutions. The tranny or drivetrain will not just slip to compensate for the larger tires, the wheels will turn a fixed amount of times for the rpm and gear of the truck. So in the same instance you mentioned above the engine will be turning less rpms to travel 65 because of the larger tires.

Yep, with a taller tire, EVERYTHING slows down....RPM, tranny, hubs....everything.
Still, dealer CANNOT legally void a warranty without PROVING that the taller tires were the direct cause of the failure. Around here the dealers sell Ford and Chevy with 6" lifts, 38" tires and full warranty.

 

[milehighassassin]

I'm not arguing that larger tires don't cover more ground. I totally get that, but there isn't something magic in the truck that tells it to slow the number of wheel revolutions down because it now has larger tires on it. To travel 65 the tires will make less revolutions, because the tires are bigger. However we are talking about tire revolutions versus engine revolutions. The tranny or drivetrain will not just slip to compensate for the larger tires, the wheels will turn a fixed amount of times for the rpm and gear of the truck. So in the same instance you mentioned above the engine will be turning less rpms to travel 65 because of the larger tires.

Larger tires cause everything to be lower.

I don't know how to break it down for you anymore.

 

[slyrydr]

moldy has it right, milehigh...you're thinking too hard...and with electronic/sensor questions, you're probably better off with a good dealer who has the proper diagnostic equipment and experience with their product...assuming the dealer is worth a crap

 

[milehighassassin]

moldy has it right, milehigh...you're thinking too hard...and with electronic/sensor questions, you're probably better off with a good dealer who has the proper diagnostic equipment and experience with their product...assuming the dealer is worth a crap

I'm not thinking too hard, I've explained it I don't know how many times. With my own car I have done the data logging. I can view among other things):
-RF Wheel Speed
-RL wheel speed
-RR Wheel Speed
-RL wheel speed
-Steering angle
-Vehicle speed (Tranmission speed)

I've seen it on my laptop. It is pretty interesting to see how much they vary as you are going arouind different corners, etc.

http://www.ross-tech.com