TurbochargedBerserker Posted March 30, 2005 Report Share Posted March 30, 2005 Great news!! Chuck found out why my FLP L5 failed recently, and the failure was not related to high torque! The forward clutches were WELDED We had added a second check valve on the vacuum lines and it seems like that second check valve was working improperly and not releasing the vacuum, so I had extremely low line pressure. The way I had the check valve installed was not quite as bad as it could have been -- it would bleed the vacuum down in a couple of seconds rather than instantly, which is why it worked great on short WOT runs and died on the first 1/4 run. All the hard parts survived fine, and the 3-4 bands survived the run, but do show signs of low pressure abuse. Needless to say we're going back to the single check valve method and will be doing the 4L65E again, as Chuck feels pretty good about the condition of the tranny other than the low pressure problem. Chuck knows exactly who got these check valve systems with the faulty valves (only 4 really high hp / high torque applications from a month ago), and it sounds like I'm the only truck guy, so every can breath a sigh of relief. Quote Link to comment Share on other sites More sharing options...
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