Oh, so now it drives forward in Neutral, and Reverse as well? And all forward selector positions?
-Oh, I think I get it: "It has Park and Drive in every position", should read "it has Park(comma)and Drive in every position".
-Well that changes everything.
-To make reverse requires the L/R band and the High clutch to work.To make Low work in position D, requires the Forward clutch and the sprag to work.To make Low work in position L requires the Forward clutch and L-R band to work. You also say that it drives forward in all selected positions(assuming you proved the shifts by increasing the mph to something like 30 mph, and felt all the shifts or saw them on the tach).
-So all this means; the forward clutch is working and so is the sprag, and the front band and high-drum are working as well.We cant prove that the L-R band is working at this point because the trans would still drive the wheels in position L, through the sprag. Only two things we dont know; 1)Is the L/R band working? and 2)why is it driving in Neutral.
-Lets examine the Neutral driving first.Well, when the manual shift valve,controlled by the roostercomb,via the external lever is in Neutral,all the trans pressures are dumped except the convertor charge circuit and the lube circuit.This means that for the trans to transmit torque through it in Neutral,(witnessed by the N-drive), with no hydraulic pressure, the problem would have to be mechanical.With a factory-type non-manual valvebody, this means the forward clutch is mechanically jammed on, or mechanically driven by the TC.
-Now, moving to the no reverse. If the F-clutch were to be jammed on, then when you select reverse,and the working L/R band applies along with the Hi-drum,Essentially the tranny should be locked up. This is because it is trying to go both forward(locked up F-clutch,and sprag, plus the L-R band), as well as reverse(L-R band and Hi-drum). At this point everything is engaged except the front band, and the vehicle should not move, and the engine rpm should not increase beyond the TC stall point.
-But if the L-R band is not working, then it will drive,fully locked up, in the forward direction, in any selector position except Park, which mechanically locks the output shaft to the case AND dumps the convertor charge pressure.
-Now heres the big question.If the tranny was working fine before the TC swap, what changed, to lock up the F-clutch, and to cause the failed L-R band? And since you didnt respond to my earlier post, Im going to assume that the TC is the culprit, and the band was near its limit beforehand.Somehow(and I dont know how), the TC is driving the Forward-clutch, or it is jammed up.
-Some assumptions have been made to arrive at this diagnoses, your results may vary.
-Remember that little comma.....
rayer:
