Posted by jimg.allentown on September 29, 2014 at 12:44:06 from (98.115.105.174):
In Reply to: trans problem posted by greg k on September 28, 2014 at 06:32:25:
Drops out of low and into reverse at 3500 rpm? That can ruin your whole day. Look at powerflow.... First gear in D: Forward clutch APPLIED. Rear roller clutch HOLDING. Second gear in D: Forward clutch APPLIED. Intermediate band APPLIED. Rear roller clutch OVERRUNNING. Third gear in D: Forward clutch APPLIED, Direct clutch APPLIED. First gear in MANUAL LOW: Forward clutch APPLIED, LOW/Reverse band APPLIED. Reverse: Direct clutch APPLIED, Low/reverse band holding. You have a situation that is somehow causing the oil flow to go to the direct clutch instead of the forward clutch. Seems to point to an issue with the valve body - specifically the shift kit. I would recommend that you send away for a rebuild manual from ATSG. They can be found on eBay or are generally available from transmission rebuilder supply houses. You may have a valve or spring in backwards or in the wrong place.
Just a few thoughts on shift kits.... In general, shift kits are aftermarket people second-guessing the engineers that designed the transmission. Sometimes they will seemingly improve shift quality or lubrication, but mostly with a compromise in another area. In general, transmissions (automatic) are designed, tested, and developed by 50-million-dollar engineering and development departments with almost unimaginable levels of talent. I don't trust a handful of Saturday afternoon NASCAR enthusiasts tinkering with a transmission to be superior talent (my opinion). Also, some shift kits involve replacing stock parts with non-standard parts to work with their mods. For example, a different valve body or separator plate gasket. Next rebuild, and stock parts are installed, and the transmission does not work right or just burns out prematurely. I am aware that the 727 does nor use valve body gaskets. I have rebuilt many of them. I just don't trust shift kits.
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