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post #1 of 21 (permalink) Old 09-19-2005, 05:32 PM Thread Starter
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Idle vibration after tranny swap

about six months ago i swapped out my aod for a m5r2, seems like ever since then i have picked up this really bad vibration at idle that goes away as soon as motor revs to 900 or above, ive changed the plugs & wires cap and rotor, the IAC is new and so is the tps anybody have any suggestions. thanks
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post #2 of 21 (permalink) Old 09-19-2005, 09:30 PM
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check your U joints, and did the driveshaft get balanced? sounds like a drivetrain problem...
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post #3 of 21 (permalink) Old 09-20-2005, 12:05 AM Thread Starter
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the ujoints are all new and the new shaft i had made was dynamically balanced to 10,000 rpms. the vibration goes away when the car is moving, its only when the motor idles below 900 that it feels like the doors are going to fall off, btw its not the motor mounts i changed those out about a month ago and the drivers side came out in 2 pieces.
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post #4 of 21 (permalink) Old 09-20-2005, 03:40 AM
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Are you NA or a Supercoupe. Maybe your flywheel needs the correct balancing. The SC has a neutral balance and the NA will be weighted.
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post #5 of 21 (permalink) Old 09-20-2005, 04:51 AM
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Quote:
Originally Posted by cougarsc
Are you NA or a Supercoupe. Maybe your flywheel needs the correct balancing. The SC has a neutral balance and the NA will be weighted.

Wouldn't that vibration get worse as the RPMs increased? Increased velocity of the flywheel = increased "centrifugal" force from the imbalance? And I could only see that being the case if the clutch were disengaged....

You may well be right, just thinking outloud.


Edit: If it's an SC, how's that harmonic balancer doing?
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post #6 of 21 (permalink) Old 09-20-2005, 12:02 PM Thread Starter
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its a n/a motor and i'm running one of specs billet stainless flywheels, and the harmonic balancer is from an SC, that was new when i redid the motor about 45K ago
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post #7 of 21 (permalink) Old 09-20-2005, 12:20 PM
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What crankshaft did you use? IF you used a NA crank, you need a NA balancer and a NA flywheel. IF you used a SC crank, you can use the SC neutral harmonic balancer and SC neutral flywheel. But if you mix and matched, I can see where the vibration is coming from.
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post #8 of 21 (permalink) Old 09-20-2005, 12:33 PM Thread Starter
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i believe its a n/a crank, when i ordered the balancer it was the only one i could find and it was for the sc motor, where on earth would i find a flywheel for the na motor they never put sticks in those cars just the sc.
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post #9 of 21 (permalink) Old 09-20-2005, 10:35 PM
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Quote:
Originally Posted by rexas89
i believe its a n/a crank, when i ordered the balancer it was the only one i could find and it was for the sc motor, where on earth would i find a flywheel for the na motor they never put sticks in those cars just the sc.
a mustang maybe?

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post #10 of 21 (permalink) Old 09-20-2005, 10:36 PM
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Quote:
Originally Posted by rexas89
its a n/a motor and i'm running one of specs billet stainless flywheels, and the harmonic balancer is from an SC, that was new when i redid the motor about 45K ago

Or when you "re-did" the engine, you could have taken the whole **** to a balance shop.
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post #11 of 21 (permalink) Old 09-20-2005, 11:19 PM Thread Starter
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when i rebuilt the motor it was still an automatic and it wasnt vibrating like it is now. i took another look at my balancer and i believe that its externally balanced cuz it looks nothing like an sc balancer
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post #12 of 21 (permalink) Old 09-21-2005, 06:50 PM
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Were there any weights on the flywheel?

91 5.0 sport:
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post #13 of 21 (permalink) Old 09-21-2005, 07:59 PM Thread Starter
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ther were no weights or anywhere to put weights on the flywheel, i think my weight on the balancer might have slipped so i got one out of the jyard today and will swap it out tonite see if this helps fingers crossed
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post #14 of 21 (permalink) Old 09-21-2005, 11:55 PM
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Quote:
Originally Posted by rexas89
ther were no weights or anywhere to put weights on the flywheel, i think my weight on the balancer might have slipped so i got one out of the jyard today and will swap it out tonite see if this helps fingers crossed

Then I'm 99.9999% sure you have a 0-balance flywheel. I'm guessing you ordered flywheel for a supercoupe? They didn't mill out the aluminum on the back side did they?


Now the question is what imbalance do you need?

91 5.0 sport:
M5R2 with B&M ripper, SC seats, 3.27 t-lok rear, 5-4.5 bolt pattern, cobra brakes front and rear, 95 Mustang cobra rims, and open exhaust.

2018 Focus RS
1995 F350 ->Mint
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post #15 of 21 (permalink) Old 09-22-2005, 02:50 AM Thread Starter
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the one i ordered was for a supercoupe but there is no aluminum on it, its pretty much a solid chunk of billet steel except for where the clutch pucks sit there is a harder piece of 1/4 steel screwed into the flywheel, this little stinkin motor of at aint one thing its another and if its not that its the stinking head gaskets grrrrrr
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post #16 of 21 (permalink) Old 09-22-2005, 11:27 AM
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Quote:
Originally Posted by rexas89
the one i ordered was for a supercoupe but there is no aluminum on it, its pretty much a solid chunk of billet steel except for where the clutch pucks sit there is a harder piece of 1/4 steel screwed into the flywheel, this little stinkin motor of at aint one thing its another and if its not that its the stinking head gaskets grrrrrr

Sorry I was thinking of the aluminum flywheel.

When you rebuilt the motor did you take it to a shop to get balanced? Maybe you have the specs for the imbalance somewhere.

91 5.0 sport:
M5R2 with B&M ripper, SC seats, 3.27 t-lok rear, 5-4.5 bolt pattern, cobra brakes front and rear, 95 Mustang cobra rims, and open exhaust.

2018 Focus RS
1995 F350 ->Mint
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post #17 of 21 (permalink) Old 09-22-2005, 12:30 PM Thread Starter
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when i redid the motor i bought a short block from evergreen cuz i didnt wanna mess with the rings and bearings, but i do still have my old motor and the original supercoupe cast iron flywheel, do you think a shop would be able to balance it out with just the balancer? cuz she is like my daily driver and i really dont want to pull the crank and flywheel out the newer motor if at all possible but if i need to i guess i will
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post #18 of 21 (permalink) Old 09-22-2005, 01:45 PM
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Quote:
Originally Posted by rexas89
when i redid the motor i bought a short block from evergreen cuz i didnt wanna mess with the rings and bearings, but i do still have my old motor and the original supercoupe cast iron flywheel, do you think a shop would be able to balance it out with just the balancer? cuz she is like my daily driver and i really dont want to pull the crank and flywheel out the newer motor if at all possible but if i need to i guess i will


What did the motor come out of?

91 5.0 sport:
M5R2 with B&M ripper, SC seats, 3.27 t-lok rear, 5-4.5 bolt pattern, cobra brakes front and rear, 95 Mustang cobra rims, and open exhaust.

2018 Focus RS
1995 F350 ->Mint
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post #19 of 21 (permalink) Old 09-22-2005, 01:51 PM Thread Starter
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which motor the rebuilt one was built for a n/a 3.8 cougar or t-bird, and thats what my old one is too, the the car i borrowed all of the tranny stuff from was an 89 supercoupe
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post #20 of 21 (permalink) Old 09-23-2005, 11:15 AM
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Sounds like you have the wrong flywheel.

What imbalance is a 3.8 n/a supposed to be?

91 5.0 sport:
M5R2 with B&M ripper, SC seats, 3.27 t-lok rear, 5-4.5 bolt pattern, cobra brakes front and rear, 95 Mustang cobra rims, and open exhaust.

2018 Focus RS
1995 F350 ->Mint
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post #21 of 21 (permalink) Old 09-23-2005, 11:31 AM Thread Starter
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i'm not sure what the imbalance is supposed to be, i think i will probly give ole tom yentzer a call at supersix cuz he did my top end and knows just about everything on these motors
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