68RFE

[gmctd]

In this thread, I will be detailing the installation of the '07.5 Dodge 68RFE 6-speed automatic into my '96 Dodge 12v - the instructions should be compatible with any chassis not using the 6.7 engine - at present, all the pieces are gathered, and each challenge is being addressed as it arises - pics to follow...........

Here's what I saw:

Here's what I got - build date on this 5000mi unit is NOV 06 - note the input and output shaft speed sensors, for accurate torque management - that's the dipstick, sans fill tube:

Note the 1/2" cooler line ports - that's the pressure sensor connector at the back of the case

Input shaft is 1.1"dia across the 26splines, 1.054"dia behind the spline - the large plate covers the dual-output pump and seals the end of the case

4wd tailshaft final inspection 335th day of '06 (Nov 06), laser etched - output shaft is same dia and spline as NV4500 and NV5600 @ 1.425"dia - 4wd adaptor flange dia and bolt-pattern fits both NP241 and NP271 transfer cases

Here is the very aggressive 13"dia t\c - the four flats drive the input gear in the pump - note the seal on the drive hub, also that it is silicone compound

Also required: larger 'cooler with larger pipes

First problem, e pluribus unum, is the pilot diameter in the 6.7 crankshaft is 2.130" while the 5.9 is 1.810" - this will require machining the 68RFE pilot hub to 1.810" to fit the 5.9 flexplate - the t\c-to-flexplate bolt pattern and bolt circle diameter is identical - I'm using the aftermarket 30% thicker flexplate - Suncoast has indicated they will build t\c's to match, as required

tbc................

 

[gmperformance03]

I'll be following this thread closely...hopefully everything goes pretty smoothly, as I might do this conversion in the near future.

Thanks for starting this thread! Good Luck with everything

 

[THEFERMANATOR]

How many splines is the output shaft? When you get the 47 out can you get us a side by side with the 68? It's nice to see somebody tackling this.

 

[KYLE@XDP]

sweet sounds like a cool project.

 

[gmctd]

Spline config is same as NV4500, NV5600, NP241DHD - 241D from the 47Rx\47RE just requires the larger input hub from the HD version

 

[gmctd]

'05 48RE input shaft is 1.040"dia across the 23 splines, base shaft dia is 0.825"

'07.5 68RFE input shaft is 1.100"dia across the 26 splines, base shaft dia is 1.054"

Output shaft is 1.425"dia, same as the NV4500 and NV5600

Doesn't seem as much of a 'joke' as some have stated, right? Only the optional Aisin AS68RE offers more torque thruput, and that is currently offered only in the cab'n'chassis series behind the 6.7

 

[05_CTD_CalebS]

This looks like a great project and I will be keeping an eye on this..thanks for the info :yesnod::yesnod: