DODGE RAM FORUM - Ram Forums & Owners Club! - Ram Truck Forum - View Single Post - Torque Converter Poll
View Single Post
Old 05-01-2012, 11:56 AM
garner's Avatar
garner garner is offline
Dodge Ram Forum Senior Member
Join Date: Nov 2010
Location: Harker Heights, TX
Age: 22
Posts: 972
Gender: Male
Vehicle: 2012 Dodge Ram lonestar
Trim Level: Lonestar
Color: Red
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
garner is on a distinguished road

Originally Posted by TransEngineer View Post
Let me correct a bit of misinformation. There already is a "permanent fix" for the T/C noise. That is the 2012 MY converter (which is a new design). So the 2012 models do not exhibit this issue.

The problem (with 2011s) is not unbalance; it is too much backlash in the spline between the TCC damper and the turbine hub. The spline backlash will naturally vary from part to part, due to manufacturing tolerances. Converters on the high end of backlash can exhibit the noise. Also, the backlash will tend to increase slightly as the spline gets worn in, so a brand new converter (with no noise) may start to make noise after a few thousand miles. But, the noise should not get worse, once the spline teeth are worn in, so I would not expect continued degradation.

The fix (for 2011 models) is a converter with a tighter (actually, slight press fit) turbine hub spline. The fix (for 2012 MY) is a new converter design which eliminates the spline altogether (it uses a riveted connection). We can't use the 2012 converters in 2011 vehicles, because they have a slightly different performance curve, so they are not certified (emissions-wise) for use in 2011 models.
Can you go further into detail about this? Is there a different tune in the 2012s than the 2011s cause of the new transmission tuning?
2012 Ram 1500 lonestar crew cab
Gone but not forgotten:
First 2011 Ram R/T in Texas
Best time: 14.7402 @87.53 on bald goodyear fortera sl 285 45 22 in 2500 DA. Corrected to 14.301 @ 90.28
Reply With Quote