torque convertor lockup
Postmaster
Joined: Mar 2001
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From: So Cal
I believe it is electronically controlled, so you could probably reprogram the computer to lock it out or change the rpm for lockup etc.
Why would you want to delete the lockup? When torque converters are not locked up they generate more heat and loose gas mileage. Unless the lockup is malfunctioning there aren't a lot of good reasons to disable it. I would probably reprogram for a better lockup rpm and or less switching back and forth, I forget what they call it but there is a technical term for the lockup to be coming off and on too often for your tastes.
Good Luck,
Jim Henderson
Why would you want to delete the lockup? When torque converters are not locked up they generate more heat and loose gas mileage. Unless the lockup is malfunctioning there aren't a lot of good reasons to disable it. I would probably reprogram for a better lockup rpm and or less switching back and forth, I forget what they call it but there is a technical term for the lockup to be coming off and on too often for your tastes.
Good Luck,
Jim Henderson
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Joined: Sep 2006
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From: pc alabama
thanks for the info, ive been having problems with the old pos truck, and now i have a vibration when cruising down the road and the truck shifts from o/d to 4th gear on its own. like when going up a hill. it is a short vibration till it goes into 4th... any ideas on that?
Postmaster
Joined: Mar 2001
Posts: 4,968
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From: So Cal
Keep in mind I am not a tranny expert I am just basing the following on my experience and reading about similar problems...
Usually when you have torque shudder, it is while the engine is under light load and cruising in OD or sometimes the next gear lower. This does not sound like your problem since your problem is happening going up hill, ie a medium to heavy load.
So I am guessing other possibilities are engine miss or perhaps there is a problem with the lubrication of the tail shaft.
Engines will seem to be running fine until they get a heavier load and then the gentle miss you have and didn't notice becomes more obvious. Shifting down decreases the load on the engine and increases the RPM so the miss gets "hidden".
There was a TSB on other model trannies, I don't know the 5R44, where the tail shaft was inadequately lubricated and was causing vibrations. Maybe this is it.
How many miles are on your tranny? Could be it is getting old? Or maybe it needs a fluid change?
Good Luck,
Jim Henderson
Usually when you have torque shudder, it is while the engine is under light load and cruising in OD or sometimes the next gear lower. This does not sound like your problem since your problem is happening going up hill, ie a medium to heavy load.
So I am guessing other possibilities are engine miss or perhaps there is a problem with the lubrication of the tail shaft.
Engines will seem to be running fine until they get a heavier load and then the gentle miss you have and didn't notice becomes more obvious. Shifting down decreases the load on the engine and increases the RPM so the miss gets "hidden".
There was a TSB on other model trannies, I don't know the 5R44, where the tail shaft was inadequately lubricated and was causing vibrations. Maybe this is it.
How many miles are on your tranny? Could be it is getting old? Or maybe it needs a fluid change?
Good Luck,
Jim Henderson
Postmaster
Joined: Mar 2001
Posts: 4,968
Likes: 3
From: So Cal
Originally Posted by b69bama69
im at about 98 to 99,000 miles on the truck. im shure a fluid change couldnt hurt it. ill try to lubricate the shaft somehow i reckon... thanks
You should do some more reading on the Tailshaft lubrication. I think it takes a specific Silicone grease. I think you are supposed to pull the drive shaft out so that the slip joint is accessable. But like I said, read read read.
Maybe a shop manual will be helpful. I vaguely recall that pulling the slip joint out isn't hard but it has been 20+ years since I actually had to do that to any of my vehicles. I think you just disconnect the other end of the drive shaft and pull backwards and the slip joint just slips out. Of course be ready to catch the joint so it doesn't hit the ground.
If the search feature on this site is working you might be able to find the TSB that talks about this specific problem.
You might also check the U joints while you are at it. Sometimes they will start to fail and cause some vibrations. If it has a zerk fitting you might hit it with some grease.
Good Luck,
Jim Henderson
Last edited by jim henderson; Feb 13, 2007 at 03:24 PM.
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Posting Guru
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If you want to disengage the torque converter while driving simply touch the brake pedal enough to turn on the stop lights. The torque converter releases whenever a brake application is detected.
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I had a similar problem and turned out that someone used and left the parking brake slightly engaged. I never use the parking brake so, I never thought about it until a day or so later and went to check. Sure enough the brake was engaged. Released it and the truck drives and shifts like it is supposed to now.
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