1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

70mph what rpm

  #11  
Old 08-12-2011, 10:11 PM
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1523 rpm at 70 mph

6 speed NV5600
Gear Vendors overdrive
3.73 axles
305/70/16 tires
26 mpg
 
  #12  
Old 08-12-2011, 11:14 PM
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RPM = (MPH x 336 x rear end ratio x ratio of gear you are in) / tire diameter


Doesn't account for slip with a non lockup auto.



Just plug in what you know to figure out what ya don't...
 
  #13  
Old 08-13-2011, 12:24 AM
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I put in the 4.10 gears back when I did the engine swap but I wish I would of went with the 3.73 I have a getrag and np205 and a Dana 70 with 4.10 gears and 37" hummer tires I wish I had the room for a gear vindors but I'm already cramped being a blazer and a divorced t case ha ha maybe a two speed rear axle would be cool if I could find one
 
  #14  
Old 08-31-2018, 10:21 PM
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Default Occasional high rpms

2006 2500 6 speed on occasions red lines at 75mph other times 2500 at 75 mph ! Wtf ! Its seriously getting annoying!
 

Last edited by Mattman; 08-31-2018 at 10:22 PM. Reason: Adding
  #15  
Old 09-26-2018, 01:52 AM
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No tack but made a chart of speed Vs rpm(math only)
stock (not accounting for tq con slip approximately 5-9% at 92.5mph @Bonneville)
RPM VS SPEED AND TRANS GEAR SELECTED w/3.55:1
235/85r16 (31.7")
.69 OD 518 auto (US Gear .20 OD not installed yet needs OD shaft insted of the .20 under shaft I have)
3.55 open gears
stock 2500 GOV (defuel starts @2000 per dyno and EGT drop)
 
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