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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Rpm matched shake in motor/trans shifter

  • Thread starter Thread starter 4.6mafia
  • Start date Start date Jun 5, 2020
4

4.6mafia

New Member
Jun 5, 2020
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1
Montana
Jun 5, 2020
#1
  • Jun 5, 2020
  • #1
I have a 2000 mustang gt, tremec t-45 I just installed new clevite rods and mains, arp rod bolts, polished crank, pilot bearing, throw out bearing, new spec stage 2 (disc and pressure plate) resurfaced flywheel. It had a exedy clutch before so i dont know if the flywheel is stock or aftermarket? Anyways I had the flywheel resurfaced. Everything seems to runs good so far expect I have a shake that is RPM matched. Doesnt matter ofnthe clutch is engaged ot disengaged, i still have the shake! Clutxh isnt slipping or even really chattering, I made sure the pressure plate was placed on the dowels (I did have to move the dowels on the pressure plate) into the machined holes. I torqued everything. It didnt shake before I did all of this, anybody have any ideas?
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
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194
Kearney, NE
Jun 9, 2020
#2
  • Jun 9, 2020
  • #2
I have an idea. First, at what rpm does the vibration show at and is the worst at?
 
4

4.6mafia

New Member
Jun 5, 2020
3
0
1
Montana
Jun 9, 2020
#3
  • Jun 9, 2020
  • #3
I can feel it throw all rpms but it gets worse at higher rpms (about 2500) ) but at idle it's not noticeable
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
7,387
2,745
194
Kearney, NE
Jun 9, 2020
#4
  • Jun 9, 2020
  • #4
That’s exactly what it was like when a mechanic did not listen to me and used a 79 302‘s flywheel and harmonic balancer on an E-7 long block. The balance weights were different and it shook strongly by 2500 RPM.
Now about the 4.6, I think they are internally balanced. So the easier answers of the damper slipping or weights getting knocked off the flywheel are not as likely. I do not want to jump to the internal balance being messed up with new rods etc, but it’s a possibility.
 
4

4.6mafia

New Member
Jun 5, 2020
3
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Montana
Jun 9, 2020
#5
  • Jun 9, 2020
  • #5
Everything is exactly the same except I put in new bearings, polished the crank, new ARP rod BOLTS, resurfaced flywheeland a spec stage 2 clutch and pressure plate, new timing chains, pilot bearing, throwout bearing and new seals for everything. New oil pump, new power steering pump.
 

Noboostedgt

Member
Jan 10, 2019
17
1
13
Vancouver,wa
Jun 11, 2020
#6
  • Jun 11, 2020
  • #6
I have the same issue. it started after putting a new clutch.I am thinking the flywheel didnt get resurfaced correctly. Is it possible that if the driveshaft gets reinstalled 180 degrees than when it was removed cause this issue?
 

Adieu

Easy there, this ain't a dating site.
20+ Year Stangneter
Mar 7, 2002
9,531
5,187
224
Jun 11, 2020
#7
  • Jun 11, 2020
  • #7
Noboostedgt said:
I have the same issue. it started after putting a new clutch.I am thinking the flywheel didnt get resurfaced correctly. Is it possible that if the driveshaft gets reinstalled 180 degrees than when it was removed cause this issue?
Click to expand...
That would cause a vibration that increased with vehicle speed, not engine RPM.
 
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