4t60e shift improver....... for lack of a better word - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-25-2010, 02:23 AM   #1
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Default 4t60e shift improver....... for lack of a better word

Has anyone here done the homemade shift improver on the 4t60e using shims or washers? I've seen the sticky on 4t65e. Speaking of trannys, anyone running Dex IV in theirs? Notice any improvement? - Roost
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Old 01-25-2010, 07:37 AM   #2
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Unfortunately the 4T60 can't get a shift kit the same way that a 4T65 does. To add a shift kit on the 4T60 it becomes part of a rebuild.

You can improve shifts though. By getting a new vacuum modulator for the front of the transmission with an adjustment on it. Usually available at most parts stores for under ~$15, one bolt and vacuum line later and you have firmer shifts.
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Old 01-25-2010, 03:59 PM   #3
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My car loves Dex VI. I have a 60E.
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Old 01-25-2010, 06:58 PM   #4
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Playing with the accumulators will change the shift feel. The stiffer the spring, the harder the upshift.
I'll bet if you scotch-brite the bores and put on new seals, you would see a difference. Also check for pin bore wear in the pistons.
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Old 01-26-2010, 12:09 AM   #5
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Whats the correct way to adjust that modulator without hurting the trans Bill?

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Old 01-26-2010, 06:35 AM   #6
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I've heard that you can add a few 1/2" washers under the accumulator like guys do with the 65 trans. Any truth to this? I have not read about using different springs though. I just want to it to shift a little quicker and firmer. Does it do the same thing when you install an adjustable vacuum modulator? Im changing my filter and adding a B&M cooler to the system in a few days. Im going to using Dex VI and add a bottle of red Lube guard as well. Im having a good time wrenching on my new bish.... - Roost

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Old 01-26-2010, 08:22 AM   #7
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I'm not 100% as I didn't play with the 60 when I had a 95. Seen a few done and it appears that the new modulators have a screw on them. Install the modulator and turn the screw a bit. Go for a drive to check it out. Turn more..drive more. Stop when happy.
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Old 01-26-2010, 11:54 AM   #8
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I'm no expert in transmissions, but I am aware of pitfalls of increasing line pressure to improve shift feel in some transmissions. I believe this is done is some shift kits. I also believe this type of shift kit caused Ford'* AODE to fail when people added these kits to their tranny'*. The higher pressure would blow seals and thus the transmission.

The other method I know of was to increase the bore size for the shift solenoids so that the same pressure would fill a solenoid faster. They would also recommend different springs. Because the line pressure is not increased, seals are not blown.

I'm not actually sure what shims do in the 4t60e transmission. I'm not sure if they increase how fast solenoids fill, or if they somehow increase line pressure, or if they do something else. Perhaps some one can tell me how shims do improve shift feel.

I also would never play around with this unless I had instructions from a very knowedgeable person.

If I am in error with any of my information, please tell me. If my information is likely to cause some one to muck around with their transmission and blow it up, my post should be removed because I don't want anyone to damage thier tranny'* on account of any information here.
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Old 01-26-2010, 12:29 PM   #9
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Adding shims or spacers shortens the travel time of the piston, therefor shifting faster. The 4t60e trans cant do this because you can't get to the accumulator without tearing in to the trans.
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Old 01-26-2010, 02:16 PM   #10
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So you can't access the accumulator by dropping the pan where the filter is?
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