Tranny problem?
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Freshman User
Joined: Jun 2006
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Tranny problem?
Hey guys, I finally took my F1 out for its first test drive since I rebuilt it, and I've got a strange and dangerous problem. A few seconds after I come to a stop, the engine starts surging and I have to stand on the brakes to keep the rear end from breaking loose, which still happens sometimes. I'm not on the gas pedal at all, its not getting caught on anything, my carb is brand new, and it did the same thing before I replaced it. This happens on hills, down hills, and on level ground. The only way I can stop it from happeneing most of the time is to shift into neutral when I come to a stop, but even then it surged like crazy when I put it back into drive once or twice. I'm running a 1965 buick 425 nailhead and turbo 400 trans. So my question is: could this be a trans problem? When I bought it there was a switch laying on the engine which I disconnected, figuring I didnt need a kickdown, and I'm not sure if this has the switch pitch...at this point I dont know what to think, other than I cant drive my truck like this!
And yeah I know I should have a ford engine and trans but I bought it with this drivetrain and it works (execpt for this) so I kept it.
Any help would be appreciated!
And yeah I know I should have a ford engine and trans but I bought it with this drivetrain and it works (execpt for this) so I kept it.
Any help would be appreciated!
Logistics Pro
Joined: Dec 2005
Posts: 4,644
Likes: 55
From: Moro Bay, AR
Sounds like a lock-up torque convertor trying to lock, but I don't think the turbo 400 had a lock-up convertor. Even then I would think it would choke the engine down before trying to break the rear tires loose. Is the engine torquing up and pulling on the throttle linkage when it does this?
Fleet Owner
Joined: Jul 2004
Posts: 27,297
Likes: 1,059
From: NM
Does a T-400 have a vacuum modulator? I don't remember, but I'm not sure how that would make it surge anyway. Nothing in the trans could make the engine RPM change upwards, is that what you mean by a "surge"? I'd look at the engine; PCV if it has it, float level, etc. Does it have an electric throttle kicker for A/C?
Postmaster
Joined: Sep 2005
Posts: 2,958
Likes: 1
The modulator would not cause it to "lock" and try to pull like that. Actually, I don't know if they even have one. I am not a ch**y guy.
If the engine is reving in neutral, that is engine related. If the engine behaves normally in neutral, then the torque converter is locked when it should not be.
Some 3 speed autos have a lockup torque converter. The older ones are genearlly centrifical. My old C5 for example.
If yours has a computer controlled lockup...that explain the switch. Someone was doing it manually.
Look at the transmission and see if there is wires going into it other than the neutral safety switch and the backup lights.
More info needed please.
If the engine is reving in neutral, that is engine related. If the engine behaves normally in neutral, then the torque converter is locked when it should not be.
Some 3 speed autos have a lockup torque converter. The older ones are genearlly centrifical. My old C5 for example.
If yours has a computer controlled lockup...that explain the switch. Someone was doing it manually.
Look at the transmission and see if there is wires going into it other than the neutral safety switch and the backup lights.
More info needed please.
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Freshman User
Joined: Jun 2006
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Checked the fluid today, it was fine. There is no A/C in it now although it probably came with it, I didnt see any unneccesary cables or wires hooked up to the throttle. I cant really tell how much of the "surge" is the engine, I'll be at a stop and all of a sudden the truck wants to take off, but it does sound like the engine is revving higher...
I'll have to check again to see if there are any extra wires going into it..
If this is a problem with the torque converter locking at the wrong time, I would have to bring this to a trans shop right? Opening up a trans is just a little out of my league...
Thanks for all the help guys
I'll have to check again to see if there are any extra wires going into it..
If this is a problem with the torque converter locking at the wrong time, I would have to bring this to a trans shop right? Opening up a trans is just a little out of my league...
Thanks for all the help guys
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Thread Starter
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Freshman User
Joined: Jun 2006
Posts: 39
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I think I might have a switch pitch trans with the settings out of whack, which is causing my converter to lock when it shouldnt. I found this page which explains alot but also confused the hell out of me http://www.442.com/oldsfaq/oftsp.htm
Now I just need to figure out how to fix it...
Now I just need to figure out how to fix it...
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