Engine/Transmission (1994 - 1998) 5th gear ratio ?

[pete97]

Is the 5th gear ratio the same in an NV4500 as in a 47RE Over Drive? Thanks Pete

 

[fortunate1]

Don't think so. Based on the replies in your other thread, the auto looks to be taller gearing in 5th/od. My driving on the highway shows the following (confirmed on the GPS to within 0. 1 mph ): 55 mph = 1500 rpm, 65 mph = 1750 rpm, 75 mph = 2000 rpm, 85 mph = 2250 rpm. These are easiest to see because they fall directly on a guage marker line. The 60, 70, and 80 figures are right in between.

 

[BigPapa]

Maybe this chart will help.



Scott

 

[pwerwagn]

5th gear on an nv4500 is 0. 75:1.

4th gear on a 47 rh/re is 0. 69:1.

6th gear on an NM5600 is 0. 73:1.



Hope that helps,

Jeff

BTW, closer to 1:1 means geared lower. 0. 69 is a higher gear than 0. 75.

 

[pete97]

Thanks, that helps alot. How come the 5spds usually get better mpg than the auto's then?

 

[BigPapa]

Probably due to the inefficiency of the auto before lock-up.



Scott

 

[pete97]

That's what I figured. I will have to check my mpg now that I have a 5spd. Pete