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fellro
New User
| Posts: 1
| Joined: 10/05
Posted: 10/11/05
01:07 PM
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Hello, my wife's 2000 Impala seems fine, other than it isn't engaging overdrive. It has 2 codes set, one for torque converter clutch staying on, the other for maximium shift. I changed the fluid and filter to see if that would help, but no difference. The pan was one of the cleanest I have seen, hardly any sediment. This car isn't driven hard at all. Suggestions as to what has happened would be appreciated, and ways to properly diagnose and/or fix as well, I have tech training and can get around inside an outomatic pretty good, just haven't had much experience on this model of trans. Thanks!
further info, the tach registers all shifts except into overdrive, and after a little bit, the lockup shws up with about a 2-300 rpm drop. When the shifter is placed in 3, it actually runs lower rpm's than in D. Also, the trans freewheels in D but not 3.
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Posted: 12/17/05
06:31 AM
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![]() fellro wrote: Hello, my wife's 2000 Impala seems fine, other than it isn't engaging overdrive. It has 2 codes set, one for torque converter clutch staying on, the other for maximium shift. I changed the fluid and filter to see if that would help, but no difference. The pan was one of the cleanest I have seen, hardly any sediment. This car isn't driven hard at all. Suggestions as to what has happened would be appreciated, and ways to properly diagnose and/or fix as well, I have tech training and can get around inside an outomatic pretty good, just haven't had much experience on this model of trans. Thanks!
further info, the tach registers all shifts except into overdrive, and after a little bit, the lockup shws up with about a 2-300 rpm drop. When the shifter is placed in 3, it actually runs lower rpm's than in D. Also, the trans freewheels in D but not 3.
Sounds like the same problem I'm having but my fluid was all black and had lots of sediment. I took it in to a shop and they said its the torque converter and it needs to be rebuild. Torque converter is locking up and it causes very hard shifts that feel like the tranny is snapping the car in half.
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Posted: 12/17/05
06:11 PM
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Check the wire harness in front of the transmission where is passes next to the a/c receiver/drier. I have seen some impala's wire harness rubbed through here and shorted out setting codes and causing the trans to act up.
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KenEbaugh
New User
| Posts: 3
| Joined: 01/06
Posted: 01/14/06
10:11 PM
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![]() Turbo Buick wrote: Check the wire harness in front of the transmission where is passes next to the a/c receiver/drier. I have seen some impala's wire harness rubbed through here and shorted out setting codes and causing the trans to act up.
Would the same apply to a 2002 Buick Regal GS [4T65E-HD] with only 46,000 [mature] miles on the odometer? Buick says it is a torque converter problem, but two independent shops say it is the 4th. gear shaft that has either sheered all splines on one end, or stripped the clutch-set in the gear-basket on the other end.
There are no error message codes set in the ECM or in the Tech II diagnostic device used in test drive, and the car drives normally except for no O/D. Shifts are at proper RPM and are smooth and solid. Fluid is at the correct level and is not burnt or stinky. FYI - Buick replaced steering gear three weeks earlier - in case that makes any difference.
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Posted: 01/15/06
08:40 PM
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![]() KenEbaugh wrote: ![]() Turbo Buick wrote: Check the wire harness in front of the transmission where is passes next to the a/c receiver/drier. I have seen some impala's wire harness rubbed through here and shorted out setting codes and causing the trans to act up.
Would the same apply to a 2002 Buick Regal GS? There are no error message codes set in the ECM or in the Tech II diagnostic device used in test drive, and the car drives normally except for no O/D.
Ken, exellent choice of cars! I would have to say yours is a different type of problem since you say no codes and no other drivability problems. First you need to find out if the computer commands fourth gear. Many trouble codes will inhibit fourth gear and they may not show up on the scanner. Most scanners can override the ecm and shift the trans manually, try this to see if the trans can be shifted to fourth. If the ecm commands fourth and manually shifting to fourth with the scanner doesn't work then its most likely a mechanical problem within the transmission.
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Posted: 01/15/06
08:44 PM
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![]() KenEbaugh wrote: ![]() Turbo Buick wrote: Check the wire harness in front of the transmission where is passes next to the a/c receiver/drier. I have seen some impala's wire harness rubbed through here and shorted out setting codes and causing the trans to act up.
Would the same apply to a 2002 Buick Regal GS? There are no error message codes set in the ECM or in the Tech II diagnostic device used in test drive, and the car drives normally except for no O/D.
Ken, excellent choice of cars! I would have to say yours is a different type of problem since you say no codes and no other drivability problems. First you need to find out if the computer commands fourth gear. Many trouble codes will inhibit fourth gear and they may not show up on the scanner. Most scanners can override the ecm and shift the trans manually, try this to see if the trans can be shifted to fourth. If the ecm commands fourth and manually shifting to fourth with the scanner doesn't work then its most likely a mechanical problem within the transmission.
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KenEbaugh
New User
| Posts: 3
| Joined: 01/06
Posted: 01/16/06
11:46 AM
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![]() Turbo Buick wrote: ![]() KenEbaugh wrote: ![]() Turbo Buick wrote: Check the wire harness in front of the transmission where is passes next to the a/c receiver/drier. I have seen some impala's wire harness rubbed through here and shorted out setting codes and causing the trans to act up.
Would the same apply to a 2002 Buick Regal GS? There are no error message codes set in the ECM or in the Tech II diagnostic device used in test drive, and the car drives normally except for no O/D.
Ken, exellent choice of cars! I would have to say yours is a different type of problem since you say no codes and no other drivability problems. First you need to find out if the computer commands fourth gear. Many trouble codes will inhibit fourth gear and they may not show up on the scanner. Most scanners can override the ecm and shift the trans manually, try this to see if the trans can be shifted to fourth. If the ecm commands fourth and manually shifting to fourth with the scanner doesn't work then its most likely a mechanical problem within the transmission.
I'm afraid the 4th clutch shaft has sheered all the splines off the end of the shaft. That is what two shops told me, anyway. Local GM dealer said it was the torque converter. But if that was the case, drivability in all other gears would also be affected. Car only has 46,000. Waiting to hear from GM Cust. Service today.
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KenEbaugh
New User
| Posts: 3
| Joined: 01/06
Posted: 01/28/06
09:38 AM
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![]() Turbo Buick wrote: ![]() KenEbaugh wrote: ![]() Turbo Buick wrote: Check the wire harness in front of the transmission where is passes next to the a/c receiver/drier. I have seen some impala's wire harness rubbed through here and shorted out setting codes and causing the trans to act up.
Would the same apply to a 2002 Buick Regal GS? There are no error message codes set in the ECM or in the Tech II diagnostic device used in test drive, and the car drives normally except for no O/D.
Ken, excellent choice of cars! I would have to say yours is a different type of problem since you say no codes and no other drivability problems. First you need to find out if the computer commands fourth gear. Many trouble codes will inhibit fourth gear and they may not show up on the scanner. Most scanners can override the ecm and shift the trans manually, try this to see if the trans can be shifted to fourth. If the ecm commands fourth and manually shifting to fourth with the scanner doesn't work then its most likely a mechanical problem within the transmission.
GM now admits the 4th clutch shaft is stripped! Scanner forced O/D, but there was no O/D available. Now, with less than 47,000 miles on car, I am awaiting their decision as to how much financial assistance they will contribute to the repair. All this over an inadequate component [4th clutch shaft] that sells for under $50.00 - and is NOTORIOUS for stripped splines. A replacement part with hardened splines costs less than $90.00 at retail. Many rebuilder sites have desciptions similar to the following:
* Hardened and improved fourth clutch hub is installed. The fourth clutch hub splines are notorious for stripping .... This fourth clutch hub will hold up to even the most demanding usage. $89.00.
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jwnichols
New User
| Posts: 1
| Joined: 08/07
Posted: 08/02/07
03:40 PM
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I have three questions about the 4th gear spline (O/D).
1. How hard are they to change or to get to to change?
2. How much could I expect it to cost to get a transmission shop to change it?
3. What risks, if any, do I run by just not putting the car in overdrive and driving it in third?
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