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I have a 2006 f350. Transmission is acting funky.
I was wondering how to tell if I have the r4100 or the 5R110w. Wikipedia says could have either. Dash says P R N D 3 2 1 if that helps, and it does have tow mode.
Also, if I have the 4100, are the two interchangeable, and is there any benefit to the 5R110W?
The last year the 4R100 was produced was 2004. All 2006 automatic Superdutys have the 5R110W regardless of engine. There were no exceptions.
As for rare and expensive, you probably mean a transmission with a PTO (Power Take Off) adapter on the side. You'd know if you had this, you would have a hydraulic dump body, or maybe a hydraulic wrecker body. 99.9% of the trucks would have no need for this.
It's worth mentioning the PTO provision as far as a pickup is concerned does not effect anything and makes no difference. Both transmissions work on a pickup. And I believe a replacement Trans from Ford will have the provision coverplate regardless.