[ehojefua]

Here's an interesting question.
Going 70mph what should the rpm read? Also if the rpm is too high ( whatever reading that is )...what is that a sign to do

 

[jordieb213]

Here's an interesting question.
Going 70mph what should the rpm read? Also if the rpm is too high ( whatever reading that is )...what is that a sign to do

Which vehicle are you speaking about?

 

[p76rangie]

About 2,600 rpms at 70MPH

 

[disco biscuit]

Torque converter lock up. But if this is a problem you should see a decent amount of rpm variance when depressing/letting off the throttle. While the tq converter is locked in 4th there should be almost zero rpm variance while in and out of the gas it just affects more or less load.

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[ehojefua]

Which vehicle are you speaking about?

@jordieb I am talking about a range rover classic LWB or SWB 1992 - 1994

 

[cnfowler]

There are several bits of key information needed. Do you have the stock 205/80R16 tires on the vehicle? Are the differential gears the stock ring and pinion? If all of that is the same, there are calculators online that will give you the information you are looking for. I did a bit of the work for you using the following:

Stock gears - 3.54
Stock tires - 28.9" tall (205/80R16)
4th gear tranny ratio - 0.73 (0.7281 rounded)
Speed - 70 mph

That info gives 2,103 RPMs

Here are the calculators I use - best I've found.
Calculators


Colin

 

[p76rangie]

There are several bits of key information needed. Do you have the stock 205/80R16 tires on the vehicle? Are the differential gears the stock ring and pinion? If all of that is the same, there are calculators online that will give you the information you are looking for. I did a bit of the work for you using the following:

Stock gears - 3.54
Stock tires - 28.9" tall (205/80R16)
4th gear tranny ratio - 0.73 (0.7281 rounded)
Speed - 70 mph

That info gives 2,103 RPMs

Here are the calculators I use - best I've found.
Calculators


Colin

What about the gearing in the transfer case. Also you need to use the rolling radius for the tyre, not the static one. I think you will find that the revs end up being around 20% higher than you calculated.

 

[ehojefua]

@Colin

It's a 1993 Range Rover County LWB......everything is stock except the tires...the tire size are 235 75 R16