a904 lock up to non lock up

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joshua dewitt

joshua dewitt

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Jun 25, 2012
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hey putting it out there... I removed my 1978' ish a904 hydraulic lock up transmission... opened up to find the problem, a ha... burnt forward clutched and steels. now.. going to make it a non-lock up model for a back up if and when I blow the a904 I built up for the current dart.... other than the input shaft,,,, and converter, and valve body... what else would I need, it has a 5 clutch setup already. all looks good other that the burnt clutches and steels in that section. can I used the same front pump and stator assy? they are in rear good shape....
 
joshua dewitt said:
so which port you block off, remove the tube, and block that port on both sides?
Click to expand...
ok, so I see you post with pics,makes sense, but what about the input housing with lock up torque converter, would like to be able to run the same between both transmissions, I had ptc make one for me., the non lock up models for standard input spline....
 
Lock-ups have a 26 tooth spline for the input shaft, non LU's 27. I believe you need to change the input shaft, reaction shaft support and valve body to fully convert. I am not a tranny expert, maybe someone with more knowledge will chime in on this.
 
I know the inputshaf neefs changed for sure. How about the pump and reaction shart support? I plan on changing. The valve body for sure. This way i can interchange. The high dollar converter. Between transmissions.
 
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