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

View attachment 1969585

View attachment 1969586

View attachment 1969587

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

View attachment 1969585

View attachment 1969586

View attachment 1969587

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.