View Full Version : Just a thought about transmissions...AOD swap to 4R70W in 89sc, possible?

05-16-2010, 11:33 PM
I just had this thought while sitting on the couch. I know the 4R70W is partially electronically controlled. Does anyone make a kit of some sort of standalone controller for this transmission to allow it to work behind the SC? Will it actually bolt on? Anyone ever attempted this?

David Neibert
05-17-2010, 11:58 AM
Yes it's possible. See this thread about converting an early model 5 speed over to a 4R70W to see what your going to need to make it work.


Another member (Kurt K. ) tried making the AOD to 4R70W conversion back in the late 90s using the Baumanator controller and failed.


05-17-2010, 02:14 PM

05-17-2010, 03:58 PM
It would be cheaper and easier to just swap the 4R70W gearset into the AOD case. That way you keep the simplicity of the AOD, but get the gear ratio benefit of the 4R70W.

05-17-2010, 05:19 PM
would 94-95 eec harness and computer work?

David Neibert
05-17-2010, 05:23 PM
would 94-95 eec harness and computer work?

That wouldn't work unless the crank sensor, balancer and timing cover were also changed.