I've got an A727 behind the Slant in my A100 van that I recently rebuilt myself. I put in a basic B&M shift improver kit(heavy duty version) AND had to replace the valve body (see below) with an available slant 6 A904 valve body (it looked the same) The problem(s) I'm having is at startup:
1) When I put it in gear theres no drive. I have to put it in neutral to get the converter filled up. Then as I'm waiting for that, fluid starts to dribble from the front seal area, and then when I put it into gear the fluid starts to pour out. But it only does this for a few seconds, then stops completely. Afterwards, when shifting and driving, all is fine. When I shut down somewhere for 5-10 minutes it's back to the delay routine, without the big leak. I was thinking converter drainback via the valve body, but so sudden? Also, there is a constant whining, or slight buzzing when it's running and driving.....my manual shows a possible valve body problem.
It may help to know that when the trans initially failed it was because of toasted clutches.All else was fine up to that point...when I pulled it apart there was no friction material left on the front clutches and the valve body was cracked at the torque converter valve cavity (I'm assuming it was the result of reving the engine to get it to move as it slipped that caused excessive pressure and then cracked?) So I thought I was lucky to have a spare slant 6 trans and pulled the valve body and compared. It looked the same to me so I used that. Is there a difference between the A727 and Slant 6 A904 valve body?
My other problem, today I noticed that my flexplate mounting holes for the converter are cracked(3 holes)! Now I'm wondering if during assembly I overlooked something....causing me the leaking and broken flexplate. Or could the somewhat hard 1st to 2nd shifts from the (lowly rated I've found) B&M shift kit be a cause for the flexplate breaking? What flexplates bolt up to a slant 6 and fit an A727 converter?
I wish I could have gone out and bought a rebuilt trans but you just can't go down to the local stores, or bone yards, and get one, as the output shaft is completly different, and my only option would have been to pull a used common trans apart to swap output shafts or pay someone to rebuild it.....Hmmm, not a bad idea..it all wnet together too easy!!! $150 crap self rebuild now..... $750 proffesional rebuilt tommorrow. Any trans "Guru's" hereto shed some light
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