February 20, 2013

Going Nowhere Fast

Wayne Colonna

Just recently my uncle backed out of his driveway with his 2003 Ford Taurus Wagon (AX4N transmission), put it in drive and had no movement. He then put it in reverse and still had no movement. So there he was stuck in front of his house, going nowhere fast! And I must say that if you are going to experience a sudden no move condition with your vehicle, there is no better place than in the front of your home. The vehicle was then brought to the good folks at R&J Transmission Service in Waldwick, N.J., where they did a great job taking care of my uncle's problem.

Figure 1


I am sure that many of you who are reading this know exactly what happened. The spline for the pump drive shaft inside the torque converter stripped out. This is a fairly common problem and most torque converter rebuilding companies install a hardened pump drive shaft sleeve (FD-WS-31) (Figure 1) into the converter to prevent this from recurring.

A similar problem occurs with Dodge vehicles as early as 1999 with either a 3.7L or 4.7L engines. The cause is different than that of Ford but the result is the same: a sudden “going nowhere fast” condition. The cause with Dodge is powdered-metal turbine hubs stripping out. This problem does not occur with the same frequency as AX4N's pump shaft splines so the cause is not as quickly identified. In fact with 45RFE transmissions many times this sudden no move is blamed on the pump since it has its own fare share of issues.

The pressed powder steel turbine hubs are made in such a way that if any engine modifications are made to increase torque, it will soon strip out. In some cases we see customers who start their vehicles and immediately select drive while idle is high, slamming the engagement. This too will eventually take out the hub.

So if a sudden no-move condition should happen to a Dodge vehicle, of course the filter and pump are to be considered, but don't forget to look inside the converter for stripped turbine hub splines (Figure 2). A steel turbine hub (CH-HT-19HS) with 29-tooth hardened internal spline is available (Figure 3). Otherwise, once you put the unit back in using the same converter, you too will be going nowhere fast!

Figure 2Figure 3
This article is ©Transmission Digest and was first published in the magazine’s February 2013 issue. It is reprinted with the magazine’s permission and that of author Wayne Colonna, President of ATSG Automatic Transmission Service Group.
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