hotrodmerc
New Member
I have a 94 with auto trans. Trans was rebuilt about 20,000 miles ago. When shifting from 1-2 it sometimes shifts hard, also sometimes when going from 2-1 it shifts hard.The fluid is clean and is not burnt. Any ideas??
auto trans shifting question
- Thread starter hotrodmerc
- Start date
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Axianator
I am a banana!
Do you know what type of work specifically was performed on the tranny? It's possible that the rebuilder modified the valve body, installed a **** and calibration kit (like a TransGo) or added his own "personal touch" to the tranny in order to bump up the line pressure on the 1-2.
n8rsk8r
Hey Where's my post?
axinator, that sounds like the OEM problems they were having with the AXODE. Don't you think? I dunno, but that is what it made me think of right off the bat. In my own opinion, which to me is gold, to others, well copper at best, but I think the guy just did a bang up job to get it done, didn't spend the time to do the work. Now that is just theory A. Theory B says he built it up and that that is just the effect of a built tranny, SHO#7 could answer this best. Hope he sees this and make a comment. My 2cents. let us know what happens!
Axianator
I am a banana!
Theory A is quite possible, especially when you think about the quality of tranny shop work these days ...n8rsk8r said:
Given the fact that the problem occurs on both the 1-2 and 2-1, I'm inclined to suspect a valve body mod/****** as being the cause.
Could very well be wrong, though!
KentuckySHOoff
New Member
**** i got the hard 2-1 shift but my 1-2 is the softest most drawn out thing on the planet.
musiccitysho
New Member
Try running a search on a TSS- transmission speed sensor.
SHO#7
SHO Member
I would start with scanning the car for codes. You never know what might just be there. But yes, TSS and possibly VSS are good reasons for a hard shift at times. I have found many a time that a bad vss signal will cause line pressure to "default" high and make the car shift hard. Even a bad MLPS can cause this.
At 20k on a rebuild, you are due for a fluid change. Get some quality fluid in there ( I recommend Mercon V ) and do a flush. You may want to add a bottle of lubeguard. That may help if there is a stuck valve like Axianator seems to be thinking.
If all else fails, on the back of the transmission in the middle is servo cover. That servo has alot to do with the 2-1 downshift. I have changed that on a few AXODE/AX4S's and that has corrected some concerns.
Hope this helps.
At 20k on a rebuild, you are due for a fluid change. Get some quality fluid in there ( I recommend Mercon V ) and do a flush. You may want to add a bottle of lubeguard. That may help if there is a stuck valve like Axianator seems to be thinking.
If all else fails, on the back of the transmission in the middle is servo cover. That servo has alot to do with the 2-1 downshift. I have changed that on a few AXODE/AX4S's and that has corrected some concerns.
Hope this helps.
MeSHOYouHow
New Member
Other factors that could cause hard shifting
I "think" that bad subframe bushings can also cause your tranny to shift hard or soft. I just had my 93 tranny rebuilt about 7k ago and i am having the same problem, shifting hard between 1st and 2nd. I think/hope my problem is a bad vehicle speed sensor. I think this might be the culprit because my cruise control doesnt always work. After my car warms up it begins to shift weak. The warmer my car is, the longer it takes for my tourque converter to grab, or it feels like it has trouble deciding which gear to shift into. Also, when going up hills it feels like it is slipping way too much. I only push the pedal in a little and it tries shifting into the lower gear but it just cannot grab like it used to, before the rebuild. Also, when accelerating around corners it seems to slip very bad. I dont know if this is becuase of bad subframe bushings. I fear that i am eroding the plates very fast and i do not want to rebuild her again.
The guy that did my rebuild gave me a 15,000 mile warranty. About 3k after the rebuild my overdrive went out! When i would go about 60mph and let completly off the pedal it would drop down to idle speed, almost like neutral, then when i pushed the gas back in, it would rev up to about 3000rpm before engaging again. This didnt seem very healthy for my torque converter because it was a pretty abrubt grab. Well, first he was trying to say it was an "electrical problem", and he doesnt do that kind of electrical work on trannies. One specific idea he had was that the overdrive override switch had something to do with it, since it never worked before. So i took her home traced the wires for the switch spliced them and ran them under the center console. Now I can briefly touch the wires together and get a cool new dummy light to come on that says "o/d off"! Woohoo!.....Still, the overdrive did not work. One change that happened was that instead of dropping to an idle at 60mph with no trottle, it stayed engaged which appeared to be better for her on the highways. So i call him up and ask him to at least look at it. Well he had to go on vaccation that week so he cannot look at it until maybe next week. I drove it for a week, nothing faster than 55mph, and just before i was going to take it back in,"to fix the overdrive", the differential went out. So I had her towed in and he said it was my fault that the diff pin broke. What was odd was I was not even abusive to her! He eventually decides that he will fix the differential for free, only because the overdrive went out. In return, he will take away the warranty! His exact words, "DO NOT BRING IT BACK!". So now if anything happens I'm up **** creek w/o a paddle! I drove by the shop to check out progress and I seen a regular taurus in his parking lot, I think he used the differential out of that peice of @#$%...which makes me wonder if there is there a difference between a normal tranny and a SHO tranny. For $1,800 he should at least rebuild her with an actual SHO tranny.(VERY RARE to find a good used SHO tranny I know!!)
I got her back and she shifts...a little weird, but she shifts none the less. I told him thanks for fixing her even though I DO NOT think it was my fault that the differential pin broke. Long story short...i mean long, I am really worried that maybe the whole experiece is going to repeat and I will have to rebuild her again.
What would some symptoms be of a bad TSS? Are they similar to the symptoms for a bad VSS. If so, which sensor should i replace first? What does the vss send messages to? Does it tell the tranny: when to shift at a certain speed with certain throttle pressure, and how hard the tourqe converter should be grabbing at a certain speed with certain throttle pressure? Very confusing to me I want/need to learn more...
Anyone have some suggestions....??
I "think" that bad subframe bushings can also cause your tranny to shift hard or soft. I just had my 93 tranny rebuilt about 7k ago and i am having the same problem, shifting hard between 1st and 2nd. I think/hope my problem is a bad vehicle speed sensor. I think this might be the culprit because my cruise control doesnt always work. After my car warms up it begins to shift weak. The warmer my car is, the longer it takes for my tourque converter to grab, or it feels like it has trouble deciding which gear to shift into. Also, when going up hills it feels like it is slipping way too much. I only push the pedal in a little and it tries shifting into the lower gear but it just cannot grab like it used to, before the rebuild. Also, when accelerating around corners it seems to slip very bad. I dont know if this is becuase of bad subframe bushings. I fear that i am eroding the plates very fast and i do not want to rebuild her again.
The guy that did my rebuild gave me a 15,000 mile warranty. About 3k after the rebuild my overdrive went out! When i would go about 60mph and let completly off the pedal it would drop down to idle speed, almost like neutral, then when i pushed the gas back in, it would rev up to about 3000rpm before engaging again. This didnt seem very healthy for my torque converter because it was a pretty abrubt grab. Well, first he was trying to say it was an "electrical problem", and he doesnt do that kind of electrical work on trannies. One specific idea he had was that the overdrive override switch had something to do with it, since it never worked before. So i took her home traced the wires for the switch spliced them and ran them under the center console. Now I can briefly touch the wires together and get a cool new dummy light to come on that says "o/d off"! Woohoo!.....Still, the overdrive did not work. One change that happened was that instead of dropping to an idle at 60mph with no trottle, it stayed engaged which appeared to be better for her on the highways. So i call him up and ask him to at least look at it. Well he had to go on vaccation that week so he cannot look at it until maybe next week. I drove it for a week, nothing faster than 55mph, and just before i was going to take it back in,"to fix the overdrive", the differential went out. So I had her towed in and he said it was my fault that the diff pin broke. What was odd was I was not even abusive to her! He eventually decides that he will fix the differential for free, only because the overdrive went out. In return, he will take away the warranty! His exact words, "DO NOT BRING IT BACK!". So now if anything happens I'm up **** creek w/o a paddle! I drove by the shop to check out progress and I seen a regular taurus in his parking lot, I think he used the differential out of that peice of @#$%...which makes me wonder if there is there a difference between a normal tranny and a SHO tranny. For $1,800 he should at least rebuild her with an actual SHO tranny.(VERY RARE to find a good used SHO tranny I know!!)
I got her back and she shifts...a little weird, but she shifts none the less. I told him thanks for fixing her even though I DO NOT think it was my fault that the differential pin broke. Long story short...i mean long, I am really worried that maybe the whole experiece is going to repeat and I will have to rebuild her again.
What would some symptoms be of a bad TSS? Are they similar to the symptoms for a bad VSS. If so, which sensor should i replace first? What does the vss send messages to? Does it tell the tranny: when to shift at a certain speed with certain throttle pressure, and how hard the tourqe converter should be grabbing at a certain speed with certain throttle pressure? Very confusing to me I want/need to learn more...
Anyone have some suggestions....??
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