will this help with my 4t60 tranny? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-28-2006, 03:32 PM   #1
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Default will this help with my 4t60 tranny?

If I put the modulator valve on (part #md 28 ) will that help with my trnny not shifting to OD until 50 to 60 mph? the tranny shfts great in all other gears.
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Old 06-28-2006, 03:58 PM   #2
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With almost nothing for load on the engine the trans should shift at 50 mph..

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Old 06-28-2006, 05:14 PM   #3
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Default so this is normal?

It seems like it is taking longer than it should to get to that last shift, it is usually at 3500 to 4000 rpms. I already have a tranny cooler installed,would this still be a good idea?
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Old 06-28-2006, 07:42 PM   #4
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I forget how much control the Vacume modulator has as far as shift timming is concerned... The first thing I would tell you to do is make sure the TV ot Throttle Valve Cable is adjusted properly

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Old 06-28-2006, 10:59 PM   #5
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From articles I have seen on the 4T60, the modulator controls the shift feel and the TV cable controls the shift point. It is apparently a little different from some other transmissions in this regard.
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Old 06-29-2006, 07:04 AM   #6
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Default Hallelujah!

My darling wife gave me another night to work on the bonne, and man did I take advantage! I put in the new modulator and adjusted the tv cable, made 2 slight adjustments on the modulator to get the tranny shifting the way I like it and she runs like new. Shifts at 3000 to 4000 rpm depending on the terrain and cruisin at 60 and 2800 to 3000 rpm. I hope all that sounds like good #*, because she runs and shifts great! I'm going to bed now, its 6am. Ck your replies later!
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Old 06-29-2006, 11:59 AM   #7
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2800-3000 at 60 almost seems like you are not getting into Overdrive

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Old 06-29-2006, 01:38 PM   #8
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yea that does seem a little high, if i recall im lower than that at 60 and i have the gx3
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Old 06-29-2006, 01:41 PM   #9
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At 60 I would expect the RPM to be around 2K or slightly less.
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Old 06-29-2006, 02:33 PM   #10
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Default ok, so what now?

what kind of adjustment needs to be made, the modulator or the cable? the last adjustment I made was on the modulator and that brought things to this pt. Should I loosen it some more?
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