Shift problem at w.o.t
Shift problem at w.o.t When driving my car at w.o.t the car somtimes wont shift from 2nd to 3Rd it will redline and stay there for a while and then finally shift. Has anybody had this happen? Is it a tranny issue or programming?
Could be either , excessive 3-4 clutch clearance can cause this but also with power adders it may be nessary to add a little more room between comanded shift and the rev limiter as with these the RPM climb faster while the time it takes the trans to shift remains constant. First I Would drop the pan and change the fluid and filter to evaluate the general condition of the trans , How many miles are on it ?
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FormerVendor
Joined: Oct 2006
Posts: 3,123
Likes: 3
From: D-F/W
98 and 99 model years are the worst Operating Systems to try to dial in. How long ago was you Tune modified?
What was the fluid condition at the time of the recent service?
Also, prior to this most recent service, how long had it been since it was done?
Most of the time when this symptom comes up and there has not been any other change in the car the issue os replated to excessive clearance in the 3/4 clutch pack. And it is not long after this symptom 1st shows up that the 3/4 clutches fail if it is contiinually driven hard.
If you would like to discuss this in detail feel free to give me a call at the shop.
g
What was the fluid condition at the time of the recent service?
Also, prior to this most recent service, how long had it been since it was done?
Most of the time when this symptom comes up and there has not been any other change in the car the issue os replated to excessive clearance in the 3/4 clutch pack. And it is not long after this symptom 1st shows up that the 3/4 clutches fail if it is contiinually driven hard.
If you would like to discuss this in detail feel free to give me a call at the shop.
g
The tune was done with the 3.42 gears about a thousand miles ago and the fluid was clean when i change it. There was no burnt smell it was red in color with very little material in the bottom of the pan. When i first put the 3.42 gears in it did this once or twice but then did not do it for a while.
FormerVendor
Joined: Oct 2006
Posts: 3,123
Likes: 3
From: D-F/W
Have the tune rechecked.
If it is intermittant, I am afraid your unit has internal issues. This is a very classic set of conditions IMHO. 3.42's are not at all abusive on these units, age and incorrect tunes are brutal on them though!
Focus on the tune and then see how it foes. If it does not change after the tune is dialed in for the gears,then it will need to come out and be modifid so that any other mods or tuning cannot affect it in the future.
Hope that helps.
g
If it is intermittant, I am afraid your unit has internal issues. This is a very classic set of conditions IMHO. 3.42's are not at all abusive on these units, age and incorrect tunes are brutal on them though!
Focus on the tune and then see how it foes. If it does not change after the tune is dialed in for the gears,then it will need to come out and be modifid so that any other mods or tuning cannot affect it in the future.
Hope that helps.
g
TECH Resident
Joined: May 2006
Posts: 969
Likes: 119
If the tune does not fix this, put a pressure gauge on the transmission and "see" what pressure you are getting? Yes, the 3-4 clutches could be starting to go away, but lets see what the pressures are first. Do not let this problem happen again till you take a reading. There is good chance to solve this if the readings are low. But if you continue having this problem, it will not be long till you will be going through the unit.
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If the tune does not fix this, put a pressure gauge on the transmission and "see" what pressure you are getting? Yes, the 3-4 clutches could be starting to go away, but lets see what the pressures are first. Do not let this problem happen again till you take a reading. There is good chance to solve this if the readings are low. But if you continue having this problem, it will not be long till you will be going through the unit.
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