4:10's ???

[RMH]

With the 4:10's. . what (with the auto)are the rpm's at 65mph. Is the 4:10's 3rd gear 1:1 or 4th gear overdrive. if 3rd what is the final drive in od. tia Also, i have the 3. 55's autoand around town and up to 55/60mph ihave the od off to try and keep the rpm's up. when driving 30mph rpm's are 12 /1300rpm's at 55mph 2100 rpm. is this normalOo. Oo.

 

[chuck3]

55 mph in 3rd lockup is about 2100 rpm and at 2000 rpm in OD is 75 mph. in mine.

 

[klenger]

Fritz's web site may answer your question about this

 

[jimnance]

4.10's

The numbers on the web-site are pretty accurate. I just changed from 3. 54's to 4. 10's because of the loads I pull, and difficulty maintaining speed up the hill.



This weekend my Dodge did it's first trip pulling the 13,000 LB fully laden toybox over the hills to the dunes at the coast.



What I found was that at 62 MPH I was turning 2000 RPM. The engine really "likes" that RPM and pulled the trailer with ease. Up the small hills (+/- 3%) I could stay in OD and pull the hills in fourth and maintain 60 MPH. The 4% grades required third gear and was able to run 45-50 MPH turning 2500-2800 RPM.



My hill climbing speeds have improved by 5 to 10 MPH because I no longer have to drop into second. Fuel economy is about the same, about 11 MPH. It would be better, but my run is constant up and down, slow down for corners, then speed up. Not the most economical driving conditions.



My fifth wheel stands 13 ft high and is 34' long so it catches lots of wind. Wind drag can make a big difference in towing performance.



I am very happy with my new 4. 10's. I miss the unladen cruising speed of the 3. 54's, but for me the trade off is worth it.

 

[RMH]

4:10's

Thanx fritz's web site says it allOo. Oo.

 

[jimnance]

Failed to appreciate the acceleration I now have with the 4. 10's.



When empty, I come off the line hard, and it pulls strong to about 75 MPH where it begins to peak out.



I have pulled away from many V-8 powered trucks, and the straight through 4" exhaust tells 'em not only can I talk the talk, but I can also walk the walk.



Yeah!