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How many RPM's at 70 w/ 4:10's and factory 20's?
Just curious............I just received my 4:10's gonna put em in soon.
Thanks! |
well when you put them in and get to cruse at 70 let me know cause im going to be getting them soon
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Originally Posted by switchblade906
(Post 1682957)
well when you put them in and get to cruse at 70 let me know cause im going to be getting them soon
But hopefully someone will chime in, forgot his name but he has 4:10's w/ factory 20's. |
it was bountyhunter but he was recently banned, no more info or pictures from him (thank god)
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This is not what you are asking but my 3 55's put me around a hair under 1500 at 60mph
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Originally Posted by dpracing57
(Post 1682954)
Just curious............I just received my 4:10's gonna put em in soon.
Thanks! http://www.4wheelparts.com/aux_incl/gear_ratio.html |
ok so i was doing the math to figure this out for you.
in my truck with 3.55's doing 65 MPH the chart says i would be doing 2349 RPM obviously thats not the case so if you minus that by 32% it will give you the right rpm's 2349 - 32% = 1597.32 RPM so then if you move to the 4.11's it says you will be running 2720 RPM so again minus that by 32 % 2720 - 32% = 1849.6 RPM so thats about what you should be running at 65 MPH |
(5)45RFE
1 3.0:1 2 1.67:1 2P 1.5:1 3 1.0:1 4 0.75:1 5 0.67:1 (545RFE only) R 3.0:1 There are the numbers for the tranny. Here is another calculator. http://www.angelfire.com/fl/procrastination/rear.html Calculates mine to 1800. In the real world my truck with 3:92's turns 2000 or so..analog... at 70 mph. I will aslo say I am taking mine in soon for a tranny check. 3:55 I drove had much more get up than this 3:92. I wish Dodge has not dropped the Getrag 238 6 speed auto that was initially planned for the 2009. |
4.10s should put you around 2000-2100 rpm @ 70mph with the factory 20s
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Originally Posted by blue2050
(Post 1683372)
(5)45RFE
1 3.0:1 2 1.67:1 2P 1.5:1 3 1.0:1 4 0.75:1 5 0.67:1 (545RFE only) R 3.0:1 There are the numbers for the tranny. Here is another calculator. http://www.angelfire.com/fl/procrastination/rear.html Calculates mine to 1800. In the real world my truck with 3:92's turns 2000 or so..analog... at 70 mph. I will aslo say I am taking mine in soon for a tranny check. 3:55 I drove had much more get up than this 3:92. I wish Dodge has not dropped the Getrag 238 6 speed auto that was initially planned for the 2009. Wasn't the Getrag 238 a 6 speed manual that was on the 4.7's pre '09? A friend has that setup and it is sweet; boy do I miss my old handshaker in a Dakota... Speaking of 6 speed autos, this is where Dodge is really lacking IMO. The Ford 6 speed ala F150 is one sweet piece; it is really nice having that extra gear before your double O/D. After putting 2500 miles on a Rental Expedition in the Rockies with the 6 speed, I'm seriously considering the F150 :cool: |
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