4L80e lock up problems, bad converter?
Thread Starter
Teching In
Joined: Aug 2005
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4L80e lock up problems, bad converter? Hi....
When lock up activates the tranny starts to hesitate and makes the whole car shake. If I give it some gas and accelerate a little the problem goes away (TCC still locked). It seems like its only doing it below 2500 rpm also and cruising.
Transmission is rebuilt, but the converter is a few years old, I bought it used...stall speed is 5k if that makes any diffrent. ( vigiliante 3-disc lockup)
The trans is controlled by a TCI TCU box and when I look at "lock up pressure" that goes from 0-80 the hesitations start when its about 60.
Been calling around some and got diffrent suggestions
- bad lockup solenoid
- glazed tcc clutch
- internal error in transmission
- to high stall
and so on.............
any hints/tips on how to rule out something or any ideas what could be wrong....
/N
When lock up activates the tranny starts to hesitate and makes the whole car shake. If I give it some gas and accelerate a little the problem goes away (TCC still locked). It seems like its only doing it below 2500 rpm also and cruising.
Transmission is rebuilt, but the converter is a few years old, I bought it used...stall speed is 5k if that makes any diffrent. ( vigiliante 3-disc lockup)
The trans is controlled by a TCI TCU box and when I look at "lock up pressure" that goes from 0-80 the hesitations start when its about 60.
Been calling around some and got diffrent suggestions
- bad lockup solenoid
- glazed tcc clutch
- internal error in transmission
- to high stall
and so on.............
any hints/tips on how to rule out something or any ideas what could be wrong....
/N
is the cam pretty radical-what about around 65-70, in the higher RPM's
have you tried locking up in 3rd with more r's
i think it might be like luggin a 4 sp, 3.00 gears and big cam
remember in o/d your like .8 something, so you need pretty high r's-i bet that hits like a bitch going into lockup with that high a stall-what your looking at could be norm.
its not like driving a stocker that idles smooth at 600 and has low end tork
have you tried locking up in 3rd with more r's
i think it might be like luggin a 4 sp, 3.00 gears and big cam
remember in o/d your like .8 something, so you need pretty high r's-i bet that hits like a bitch going into lockup with that high a stall-what your looking at could be norm.
its not like driving a stocker that idles smooth at 600 and has low end tork
is the cam pretty radical-what about around 65-70, in the higher RPM's
have you tried locking up in 3rd with more r's
i think it might be like luggin a 4 sp, 3.00 gears and big cam
remember in o/d your like .8 something, so you need pretty high r's-i bet that hits like a bitch going into lockup with that high a stall-what your looking at could be norm.
its not like driving a stocker that idles smooth at 600 and has low end tork
have you tried locking up in 3rd with more r's
i think it might be like luggin a 4 sp, 3.00 gears and big cam
remember in o/d your like .8 something, so you need pretty high r's-i bet that hits like a bitch going into lockup with that high a stall-what your looking at could be norm.
its not like driving a stocker that idles smooth at 600 and has low end tork
Thread Starter
Teching In
Joined: Aug 2005
Posts: 31
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Cam is not that big, a 229/239 114lsa 0,590" is not that big in a 415cui 
Will check how the rpm drops when lockup, but yes it hits pretty hard if I'm not prg it to go in slow
Doesnt feel like normal because if feels and sounds like a "mechanical" noise almost like the tranny hits the floor......
Will do some more driving at lower rpms with it locked and also in 2'nd and 3'gear just to se if there is some diffrence........
But for what I know now is goes away with more rpm or just a little acceleration...............
Will check how the rpm drops when lockup, but yes it hits pretty hard if I'm not prg it to go in slow
Doesnt feel like normal because if feels and sounds like a "mechanical" noise almost like the tranny hits the floor......
Will do some more driving at lower rpms with it locked and also in 2'nd and 3'gear just to se if there is some diffrence........
But for what I know now is goes away with more rpm or just a little acceleration...............
Thread Starter
Teching In
Joined: Aug 2005
Posts: 31
Likes: 0
anyone with a tci377000 box that can check if the TCC DC goes from 0-80 when lockup occurs?
For what I've found bigger DC means lower pressure, makes me think when pressure is too low the TCC starts to slip.............
For what I've found bigger DC means lower pressure, makes me think when pressure is too low the TCC starts to slip.............
