[Majorlk]

I have a MY10 with the 4EAT. At 65 mph the engine is turning over 2,500 or so RPM. AT 70 it is hitting a couple of hundred more. Is this normal or is the TC not locking?

I have been used to 4-speed autos with an overdrive gear that dropped the RPM considerably when it engaged.

 

[trailangel]

That sounds right, although I have a manual trans, it's about the same.

 

[Majorlk]

That sounds right, although I have a manual trans, it's about the same.

Thank you. I'm used to seeing 2,100-2,220 at 70 mph on flat ground. But to be fair, that was with 3.6l V6s. It's been 25 years since I had a 4-cylinder (mid-80s Plymouth Voyager).

 

[trailangel]

Same here... I'm used to cruising a V8 at 70mph and I think it was about 1800 RPM.. just loping along.

Think of these 4 bangers as a motorcycle engine and just wind it up.

I went one larger tire size and it drops my RPM down about 100 RPM on the highway.

 

[Guest]

2500 RPM at 65 mph is where it should be.

 

[Majorlk]

2500 RPM at 65 mph is where it should be.

Thanks ... I keep waiting for the OD to kick in and it never happens. :shake:

 

[trailangel]

You are in OD

 

[Majorlk]

You are in OD

What OD? TC lock?

There's no mention of OD in the manual and every vehicle I've owned with an OD transmission has an option to turn off the OD. There is no such option on this vehicle.

 

[trailangel]

Here are your gear ratios:
X, X Premium,
Manual: 1st: 3.454, 2- 2.062, 3- 1.448, 4- 1.088, 5- .780, rev 3.333. final 4.111
Automatic 4spd SportShift : 1st 2.785, 2nd 1.545, 3rd 1.0, 4th 0.694 reverse 2.272; final 4.444

Since the automatic's fourth gear is less than 1, I consider this an overdrive.
So you are saying you cannot lock out this 4th gear?
I haven't driven the automatic so it's best if left to somebody else to comment on this.

 

[adc]

Since the automatic's fourth gear is less than 1, I consider this an overdrive.
So you are saying you cannot lock out this 4th gear?
I haven't driven the automatic so it's best if left to somebody else to comment on this.

Majorlk you are in Torque lock at 2500 rpm. And as mentioined 4th is Overdrive. If you would not be in torque lock your rpm's would be around 2800 rpm.

 

[Majorlk]

Majorlk you are in Torque lock at 2500 rpm. And as mentioined 4th is Overdrive. If you would not be in torque lock your rpm's would be around 2800 rpm.

I guess I understand, but in every other transmission I've had, OD was essentially a 5th gear. There was a very obvious drop in RPM when it engaged.

Another difference to get used to ...

 

[Guest]

The torque converter locking IS your "overdrive". Very primitive, I know. :lol:

 

[Majorlk]

The torque converter locking IS your "overdrive". Very primitive, I know. :lol:

Gotch ya'

Thanks everyone, it's been informative.