Hi all

I am looking at a 2005 3500 4X4 4 door with duals I took it for a drive rides nice but looking at it, it is hard to tell how many gears it has in the automatic. When I put it in tow/haul mode it was the same RPM as if I put in number 2 It has D,2,1 on the column. Does that mean it is a 3 speed auto?

Or does it have a 3 speed with a hidden 4th overdrive?

Thanks

Tom

 

Its a 4 speed OD transmission, designation 48RE. he OD is a ECU controlled shift so yes it is kinda hidden. The TH is a modified shift strategy, not OD lockout like earlier models, that extends shift points and locks the TC sooner.

You will need to get over 45 mph for it to shift to OD so if you were just tooling around it may have been in drive only, or if you were slow enough it may have down shifted to 2nd.

 

True if stock from the factory, but there is a dealer flash (forgot the TSB#) out there that makes it a true OD lockout.

 

...and looses the aggressive lockup features and extended shift points. It softens it up to the mushy NVH opration that is not very useful for anything, IMO.

 

If I were to get the dealer to do the latest engine re flash would it cause the above mentioned OD lock out, which sounds like is not a good thing?

 

No, its a special flash that has to be requested and installed seperately from all the other updates. The normal flash updates should not effect it and should only address issues around the OEM flash.

 

So is it 4 speeds plus OD, or 3 plus OS?

 

Correction...it is in the latest flash but must be enabled by the drb3.It can be switched on and off with the drb so if you decide you don't want it it can go backwards.

 

It is a 3spd plus o/d

 

Ok ... I started this thread and I have decided on not buying that truck... but I have just bought an 2006 Dodge dually with a stick. There is not a lot of them around but I did find one and meets my requirements..

Thank you for answering my question... I kind of thought it was a 3 speed with something extra.

 

Technically its a 3spd with OD and locking torque convertor. When the TC locks up its sometimes feels like half an upshift.