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Car slamming into gear, shifts hard.

11K views 14 replies 8 participants last post by  JamesH  
#1 ·
I have a 95 gs-t A/t with 126000 miles. It shifts hard as fuck when going into to drive or reverse or out of drive or reverse. It also seems like it takes a brief moment for it to engage into drive the first time I shift it into drive after it gets cold. I replaced the tranny fluid with atf+4 and put in 10oz of lubegard in the black bottle. I also put in a new tranny fluid filter. This helped the hard shifting somewhat but it still has the same symptons, just not as bad. The old fluid had a metallic gleam and was a dark, dark red. The tranny doesnt slip, but it does seem to take a while to shift sometimes.

Any suggestions are appreciated!
 
#2 ·
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#6 ·
Im not sure if the 2G's transmission shift points are dependent on the TPS like the 1G's are because I had issues with my 1G shifting rough etc.. turns out the TPS was bad and was out of adjustment, soon as I replaced it and adjusted it I got my smooth downshifts etc.. back.
 
#9 ·
Transmission slips when shifting into 3rd from 2nd. Well, it seems like it goes into neutral for a split second then shifts into 3rd. I've seen this with dsm trannys before and they lasted a good while(I've never seen one fail with this symptom). I really would like help to diagnose the issue. I am in no way a transmission guru but it seems like a fluid pressure issue since it only does this in partial throttle conditions. But, it can always be the clutchs, right?
 
#10 ·
It is NOT the clutches.


Re-adjust your TPS; the TCU is reliant on TPS for shift points and shift pressure.


This is because of a malfunctioning pressure control solenoid valve, most likely. Pull the transmission pan, un-bolt the valve body, and then take out the solenoid with the blue wire going to it. Take ohm readings.
 
#11 ·
dmc0162 said:
It is NOT the clutches.


Re-adjust your TPS; the TCU is reliant on TPS for shift points and shift pressure.


This is because of a malfunctioning pressure control solenoid valve, most likely. Pull the transmission pan, un-bolt the valve body, and then take out the solenoid with the blue wire going to it. Take ohm readings.
Thanks alot man, I was confused cause it shifts quicker the more torque thats applied.
 
#12 ·
dmc0162 said:
It is NOT the clutches.


Re-adjust your TPS; the TCU is reliant on TPS for shift points and shift pressure.


This is because of a malfunctioning pressure control solenoid valve, most likely. Pull the transmission pan, un-bolt the valve body, and then take out the solenoid with the blue wire going to it. Take ohm readings.
What should the ohm reading range be?

I'm guessing around 70 ohms?
 
#14 ·
If im recalling the OHMS should be .9 or broken down to .90 when at just closed-idle. I had mine set at .90 but was getting rough shifting when slowing down into 2nd and 1st gear. I actually went and brought the ohms down to .85 ohms which got rid of the harsh downshifts almost all together but I lost some power and have somwhat ruff upshifts. My recomendation is to use a very good Multi-Meter and dont rely on the cheapo ones as my cheapo one didnt originally tell me my TPS was bad until I let a tech at my job use some crazy Multi-Meter that records spikes in V-OHMS, thats when he spotted it was bad.