TKX Post Swap RPM Related Vibration

[watermelon]

i take it as NO vibration issue prior to upgrade?

been a while since i used an SST Kit to perform a 727-to-TKO upgrade

on my conversion thread i took a straight edge from the block n valve covers and marked a few dots on firewall prior to upgrade just for reference. i think after the upgrade my engine rear was pointed downward from the marker dots. tough to remember but i my angle was good but i went ahead and added a shim to bring up engine close to the original marker dots, couldn’t get it exactly as before.

might be worth a try to shim it up at the trans mount if you have some reference pics to review


watermelon

 

[furious70]

i take it as NO vibration issue prior to upgrade?

been a while since i used an SST Kit to perform a 727-to-TKO upgrade

on my conversion thread i took a straight edge from the block n valve covers and marked a few dots on firewall prior to upgrade just for reference. i think after the upgrade my engine rear was pointed downward from the marker dots. though to remember but i my angle was good but i went ahead and added a shim to bring up engine close to the original marker dots, couldn’t get it exactly as before.

might be worth a try to shim it up at the trans mount if you have some reference pics to review


watermelon

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That's smart. I'm going to do that when I swap in the 727/GV in my 72

 

[1970DCH]

i take it as NO vibration issue prior to upgrade?

been a while since i used an SST Kit to perform a 727-to-TKO upgrade

on my conversion thread i took a straight edge from the block n valve covers and marked a few dots on firewall prior to upgrade just for reference. i think after the upgrade my engine rear was pointed downward from the marker dots. tough to remember but i my angle was good but i went ahead and added a shim to bring up engine close to the original marker dots, couldn’t get it exactly as before.

might be worth a try to shim it up at the trans mount if you have some reference pics to review


watermelon

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Correct, no vibration prior to. Yes, mine does now tilt back more and according to SST, this is necessary for clearance, but there is some room into shim it up that I will do. Good call out to mark it; I didn't mark it, but I noticed right away due to a few reference points that I was very familiar with.

 

[nativefx]

Did SST tell you how much more tilt? I've got to remeasure all my angles once i get my 4 post put together and see if I have room to shim the trans if necessary. I've been trying to make adjustments by shimming the rear and its gotten better, but not completely fixed. Really only happens in 4th gear at around 2300-2400 rpm.

 

[1970DCH]

Did SST tell you how much more tilt? I've got to remeasure all my angles once i get my 4 post put together and see if I have room to shim the trans if necessary. I've been trying to make adjustments by shimming the rear and its gotten better, but not completely fixed. Really only happens in 4th gear at around 2300-2400 rpm.

They did not say, but the solution is to shim up the trans or change the angle of the rear end. In my case, I did adjust the angle of the rear end to be in spec; if I shim the trans, it will be even more in spec, which I am planning to do.

Tremec has an app where you can use your phone to measure and do the calculations, but I just used an angle finder and manually calculated my angles for adjustment.

 

[watermelon]

ill have to get my 66 back on it’s wheels soon and let it settle for a bit .. will get an angle measurement pic at some point

what’s weird for my tko is that with engine running i cannot shift into gear (1st, other) and without engine running i can shift into any gear i chose … not sure what’s happened but have not put on vary many miles for a few months now


watermelon

 

[1970DCH]

ill have to get my 66 back on it’s wheels soon and let it settle for a bit .. will get an angle measurement pic at some point

what’s weird for my tko is that with engine running i cannot shift into gear (1st, other) and without engine running i can shift into any gear i chose … not sure what’s happened but have not put on vary many miles for a few months now


watermelon

This issue that you are describing is because the clutch is not fully disengaging. You can shift with the engine off because the input shaft isn’t spinning. If you used to be able to shift, I would try re-bleeding the system and go from there.

 

[Kern Dog]

I found that the header collectors say 3/4” closer to the floor with the SST Tremec 5 speed in place. My car is as smooth as a new car though.
Now it is.
With the5 speed and 440/493, it always had some shake to it. An engine rebuild in 2022 included new balancing that must have corrected a balance flaw I had before because I now run a huge cam and the engine does not shake like it did with this same cam I used years ago.