Do I have a C6 shift kit?
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Freshman User
Joined: Sep 2017
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From: Francis
Do I have a C6 shift kit?
I replaced my faulty trans with a used one, because it was stuck in drive. It shifted through the gears nicely though.
Now, the new one only shifts at fairly high rpm, depending on how heavy my foot is into it. I disconnected kickdown, and same issue. I replaced modulator with original, which shifted old trans fine, and same issue. I am gonna buy a new modulator today and try it.
I don't have a tach, but under 'normal' acceleration, shifts happen around about 3000 rpm. 1st to 2nd shifts seem to happen hard, 2nd to 3rd seems to be a little more normal, but hard to tell. With kickdown unhooked, extremely light throttle will shift it a liitle sooner, while a heavy foot will shift a bit later. With kickdown hooked up, shifting is about the same, but at steady cruising, even the slightest push on pedal will down shift trans. Shifting from park to drive, or reverse, seems to engage normal.
My next question is, how much vaccuum at idle is there to be at the modulator? I can feel some pull, but I had to touch hose a couple times just to be sure. Hoses seem fine, plus original trans was shifting normal.
Could p/o have put in a shift kit?
Governor issue?
Now, the new one only shifts at fairly high rpm, depending on how heavy my foot is into it. I disconnected kickdown, and same issue. I replaced modulator with original, which shifted old trans fine, and same issue. I am gonna buy a new modulator today and try it.
I don't have a tach, but under 'normal' acceleration, shifts happen around about 3000 rpm. 1st to 2nd shifts seem to happen hard, 2nd to 3rd seems to be a little more normal, but hard to tell. With kickdown unhooked, extremely light throttle will shift it a liitle sooner, while a heavy foot will shift a bit later. With kickdown hooked up, shifting is about the same, but at steady cruising, even the slightest push on pedal will down shift trans. Shifting from park to drive, or reverse, seems to engage normal.
My next question is, how much vaccuum at idle is there to be at the modulator? I can feel some pull, but I had to touch hose a couple times just to be sure. Hoses seem fine, plus original trans was shifting normal.
Could p/o have put in a shift kit?
Governor issue?
Junior User
Joined: Nov 2017
Posts: 74
Likes: 1
From: Mokelumne Hill
The vacuum at the modulator should be the same as intake manifold vacuum. If it is lower then start looking for a restriction or straight up blockage like say from carbon buildup.As for this trans to have a shift kit in it, yes that is possible. Shift points are raised by manipulating the springs in the governor.. Simply gank the governor off yer old one and try it on the one in the truck now. No need to gank the trans, simply remove the drive shaft and extension housing to expose the governor.
Senior User
Joined: Nov 2013
Posts: 160
Likes: 0
So my 76 swb 2wd has a transgo shift kit, nothing special. I dont have a kickdown bar. But ill describe the shifts for you to compare. Under very light acceleration it will shift 1 2 3 fairly quickly even before i get across to the other side of an intersection not really getting above 1600 rpm. If i stand on it hard it will shift at around 4000 rpm and bangs hard when it shifts, no lag between gears, its loud and violent under a heavy accel. Mid throttle “peppy” drivng we will call it sees a mix of the two with still hard shifting, but a much lower shift point about 2200 rpm.
Hope that helps!
Hope that helps!
Postmaster
Joined: Sep 2013
Posts: 2,595
Likes: 5
From: Pasadena, Ca
The modulator can be adjusted with an 1/8" allen wrench. There is an adjustment screw inside the hole where the vacuum hose plugs onto. 1/4 turn is a lot of adjustment, so dont go crazy.
If you buy a new modulator, you will still have to adjust it.
If you buy a new modulator, you will still have to adjust it.
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