But what exactly is a 618 transmission? Looking at ATS website, thinking I may try to put OD in before, ok sometime, next year.

 

a618 is a 47rh if I'm not mistaken 94-95 2nd gens, a518 was the 46rh in the 91.5-93 1st gens.

 

46RH

A renamed A518. A727 with overdrive and hydraulic control.

Applications:

1994-1995 Dodge Ram 2500/3500 V8
1993-1995 (Jeep Grand Cherokee 5.2)
1995 Dodge Dakota 5.2l magnum v-8
1995 Dodge Ram Van 2500 5.2L Magnum V8

46RE

A renamed second-generation A518. A727 with overdrive and electronic control.

Applications:

1996 Dodge Dakota V8 (Also 98-03 Dakota 5.9L R/T)
1996-2002 Dodge Ram 1500/2500/3500 V8
1998-2003 Dodge Durango 5.9L V8 (4WD or 2WD)
1998 Jeep Grand Cherokee 5.9L V8 (4WD)

47RH

A renamed A618 and hydraulic control.

Applications:

1994-1995 Dodge Ram 2500/3500 Diesel/V10

Cummins
47RE

A renamed second-generation A618. A heavy-duty A727 with overdrive and electronic control.

Applications:

1996-2002 Dodge Ram 2500/3500 Diesel/V10

48RE

The 48RE is an electronically-governed, four-speed heavy-duty overdrive automatic transmission, stronger than its predecessor, the 47-series.

Gear ratios:
1 2 3 4 R
2.45 1.45 1.00 0.69 2.21

Applications:

2003-2004 Dodge Ram 2500/3500 ISB Diesel
2003-2004 Dodge Ram 2500/3500 HO ISB Diesel
2004-2007 Dodge Ram 2500/3500 600/610 Diesel
2004-2006 Dodge Ram SRT-10

 

46RH, but much beefed up is also used in 91.5 - 93 CTD.

Main sun gear carrier, for instance, is steel. TQ is different, etc.

 

a618 is identical to an a518 with the difference being the a618 has overdrive AND lockup

 

OK, sounds simple.

Want to go to an OD but wow, I can hardly get $300 saved up at once, let alone $3000, plus the core.