Alex Sirum GMC Motorhomes, Inc.
1800 Hwy 70 East
Okeechobee, FL 34972
Phone (863)763-1121 
Fax (863)763-1124
sirum@gmcmh.com  www.gmcmh.com

 

Final Drive, Differential or 

Rear End

   
     
  Several different names for the same part.  Whatever you choose to call it, this is the part that makes your GMC go.

Much discussion has been raised over the final drive gear ratio of the GMC.  The original ratio was 3.07, several people claim that this was an oversight of the engineers at GM.  The tire size and configuration of the motor homes'  drive line didn't take full advantage of the Olds 455 engines.  By that I mean the engines RPM's are too low to obtain maximum torque under normal driving conditions. 

The simplest solution is to change the final drive gear ratio.

  We have offered  several options which included   3.21,  3.46, 3.55 or 3.70.    Of these the most popular and best suited is the  3.55   which we now have in stock and can readily install.  

If you have any questions about final drives, gear ratios or what we can do to improve your GMC's driving performance please give us a call.     

 
 
     
 

General Information: Sirum@gmcmh.com
Sales: Ask for Jeff or Debra

Alex Sirum GMC Motorhomes, Inc.
1800 Hwy 70 East
Okeechobee, FL 34972
Phone (863)763-1121  Fax (863)763-1124