The 700R4 was based on the Turbo Hydro 350.
The TH2004R was based on a different transmission, all the information is available online in several places.
Neither was based on the Turbo Hydro 400. The 4L80E, 4L85E, 6L80 and 6L90 were based on theTH400. I'm not sure about the 8L90.
R.
TY for updating my incorrect info....
very interesting, as i have read lots of printed material that clearly states the 700R4 WAS based on the TH400. my local trans guy has shown me the later L80 series parts comparison[s] between them and the TH400, but we never discussed the 700R4. thank you for the information ! just goes to show it's possible to teach an OLD guy[dog] new tricks !
