those of you who have alot of automatic expierence please help.

e3sean · October 9th, 2008, 11:27 PM

alright so my car has a bad vibration even in neutral at a stop from about 2700 + it didnt do that prior to the c4 swap. i got the right 28oz flexplate for my 347 stroker.but when i bolted it up to the motor we were not able to spin the converter to get to the holes to bolt the converter cause it was pressed against the flexplate and it was spinning with it. i have a blocking plate (seperator). so we loosened the tranny up and started the bolts before we tightend the tranny to the block.. is it possible i bent the flexplate and that is causing the vibration? has anyone ran into this before?

i made sure the converter was all the way on the transmission prior to bolting it up.

superbean · October 9th, 2008, 11:30 PM

did you make sure it's not something simple as a loose bolt on your u joints?

if the flexplate was bent at all.. your starter would whine quite a bit..

e3sean · October 9th, 2008, 11:31 PM

Originally Posted by superbean

did you make sure it's not something simple as a loose bolt on your u joints?

if the flexplate was bent at all.. your starter would whine quite a bit..

the u joint is not spinning when the car is not moving. it does it in neutral while stopped.

78mach1 · October 10th, 2008, 02:26 AM

your car was a manual right?......did you remove the pilot bushing in the back of the crank before you assembled all this?

that would be your problem, i hope you didnt bend your flexplate.

e3sean · October 10th, 2008, 03:10 AM

Originally Posted by 78mach1

your car was a manual right?......did you remove the pilot bushing in the back of the crank before you assembled all this?

that would be your problem, i hope you didnt bend your flexplate.

yeah i took the pilot bearing out.

78mach1 · October 10th, 2008, 11:15 AM

well then everything should have fit together nicely.

is there any noise?....or just a vibration?

1slo5.0 · October 10th, 2008, 12:22 PM

Was the engine balanced with the flexplate or was it balanced with a flywheel from when it was a manual transmission?

badshoe · October 10th, 2008, 12:25 PM

Did you change the damper to a 28 oz.? It sounds like the converter was not all the way in tranny at the start or the converter has hurt the pump when it was't lined up with the flywheel. Converter studs must be lined the flywheel holes when installing and the studs should be loose the holes once the tranny is bolted tight. The converter, flywheel or pump may be damaged now.

ryans88gt · October 10th, 2008, 12:59 PM

all I got to say is automatics and mustangs don't go together. you car is probably pissed at you for forcing a slushbox into it's unsuspecting tunnel.

78mach1 · October 10th, 2008, 03:45 PM

Originally Posted by ryans88gt

all I got to say is automatics and mustangs don't go together. you car is probably pissed at you for forcing a slushbox into it's unsuspecting tunnel.

gotn20 · October 11th, 2008, 01:46 PM

Originally Posted by ryans88gt

all I got to say is automatics and mustangs don't go together. you car is probably pissed at you for forcing a slushbox into it's unsuspecting tunnel.

ha ha awesome

e3sean · October 11th, 2008, 03:21 PM

Originally Posted by badshoe

Did you change the damper to a 28 oz.? It sounds like the converter was not all the way in tranny at the start or the converter has hurt the pump when it was't lined up with the flywheel. Converter studs must be lined the flywheel holes when installing and the studs should be loose the holes once the tranny is bolted tight. The converter, flywheel or pump may be damaged now.

yeah i made sure the converter was all the way in to the 2 shafts and the pump

yeah i got the 28oz flxplate and the damper has been 28oz since the stroker build.

when i piulled it apart the converter was able to spin but i dont thik i had enough space i was told that sometimes you need 2 blocking plates to get the right spacing. i am taking the flywheel to the machine shop today to have it checked out.

1slo5.0 · October 12th, 2008, 09:58 AM

Originally Posted by e3sean

yeah i made sure the converter was all the way in to the 2 shafts and the pump

yeah i got the 28oz flxplate and the damper has been 28oz since the stroker build.

when i piulled it apart the converter was able to spin but i dont thik i had enough space i was told that sometimes you need 2 blocking plates to get the right spacing. i am taking the flywheel to the machine shop today to have it checked out.

It is very possible that you have a flexplate causing your problems if you didn't take it to the machine shop that balanced your rotating assembly. Most shops keep the info on file for their customers. I've run into this before. A friend of mine changed to an SFI flexplate from a stock type flexplate and didn't have the flexplate modified accordingly. The engine shook real bad and it took out the main bearings also. Chances are when they balanced the original assembly they modified the weight on your flywheel or drilled some holes to balance everything. The same will need to be done for your flexplate. Get some new bearing right away too, you are going to need them. If the engine is out of balance enough to shake, it has also damaged the bearings.

You never need two block plates to get the right spacing. If you need more than one block plate, something is wrong. Don't fix problems with problems.

e3sean · October 12th, 2008, 04:48 PM

Originally Posted by Darrell

It is very possible that you have a flexplate causing your problems if you didn't take it to the machine shop that balanced your rotating assembly. Most shops keep the info on file for their customers. I've run into this before. A friend of mine changed to an SFI flexplate from a stock type flexplate and didn't have the flexplate modified accordingly. The engine shook real bad and it took out the main bearings also. Chances are when they balanced the original assembly they modified the weight on your flywheel or drilled some holes to balance everything. The same will need to be done for your flexplate. Get some new bearing right away too, you are going to need them. If the engine is out of balance enough to shake, it has also damaged the bearings.

You never need two block plates to get the right spacing. If you need more than one block plate, something is wrong. Don't fix problems with problems.

i am gonna get a new flexplate from the machine shop i only drove it for like 3 or 4 miles and it was pretty light driving. i cant afford to replace bearings right now. the engine wasnt shaking i have solid motor mounts thats why it was noticed very easily. it wasnt horribly vibrating but enough for me not to want to drive it anymore.

ryans88gt · October 12th, 2008, 07:01 PM

Take your old flywheel in and have the flexplate balanced to match the flywheel and you should be set.

e3sean · October 12th, 2008, 09:00 PM

Originally Posted by ryans88gt

Take your old flywheel in and have the flexplate balanced to match the flywheel and you should be set.

i sent the flywheel to florida to a buddy i believe they balenced my flywheel to an in house one at the machine shop i am going there to see them tomorrow.

78mach1 · October 13th, 2008, 04:00 AM

this is off topic but........should have went for the OD.....=P

e3sean · October 13th, 2008, 04:39 AM

Originally Posted by 78mach1

this is off topic but........should have went for the OD.....=P

you have another 1k for me?

78mach1 · October 14th, 2008, 02:43 AM

hahah you can build a hell of a AOD with 1k.

you can take a stock AOD, change out the valve body, (or drill it like i did), transgo kit, hi-rev kit, sonnex boost valve, hardened input shaft, a good servo, and it will be a damn good street strip trans for a decent price.

or go all out and replace the clutch packs, along with the forward drum and the sun shell.

then its bullet proof.

e3sean · October 14th, 2008, 04:54 AM

Originally Posted by 78mach1

hahah you can build a hell of a AOD with 1k.

you can take a stock AOD, change out the valve body, (or drill it like i did), transgo kit, hi-rev kit, sonnex boost valve, hardened input shaft, a good servo, and it will be a damn good street strip trans for a decent price.

or go all out and replace the clutch packs, along with the forward drum and the sun shell.

then its bullet proof.

well where the hell were you when i was looking for one???? i woulda paid you to build me one. i have never done an automatic and everywhere i called ither didnt build them or wanted way too much to build it.

October 9th, 2008, 11:27 PM	#1
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	those of you who have alot of automatic expierence please help. alright so my car has a bad vibration even in neutral at a stop from about 2700 + it didnt do that prior to the c4 swap. i got the right 28oz flexplate for my 347 stroker.but when i bolted it up to the motor we were not able to spin the converter to get to the holes to bolt the converter cause it was pressed against the flexplate and it was spinning with it. i have a blocking plate (seperator). so we loosened the tranny up and started the bolts before we tightend the tranny to the block.. is it possible i bent the flexplate and that is causing the vibration? has anyone ran into this before? i made sure the converter was all the way on the transmission prior to bolting it up. __________________

October 9th, 2008, 11:30 PM	#2
superbean Hardcore Enthusiast 1998 Cobra 13.24@105.66 Join Date: Aug 2008 Location: North Carolina Posts: 1,778 iTrader: 0 reviews	did you make sure it's not something simple as a loose bolt on your u joints? if the flexplate was bent at all.. your starter would whine quite a bit.. __________________ weeee foooord!

October 10th, 2008, 12:22 PM	#7
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Was the engine balanced with the flexplate or was it balanced with a flywheel from when it was a manual transmission? __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

October 10th, 2008, 12:25 PM	#8
badshoe Regular Join Date: Dec 2007 Posts: 59 iTrader: 0 reviews	Did you change the damper to a 28 oz.? It sounds like the converter was not all the way in tranny at the start or the converter has hurt the pump when it was't lined up with the flywheel. Converter studs must be lined the flywheel holes when installing and the studs should be loose the holes once the tranny is bolted tight. The converter, flywheel or pump may be damaged now. __________________ BadShoe Productions, How-To-DVD's specializing in Ford drivetrains www.BadShoeProductions.com Last edited by badshoe; October 10th, 2008 at 12:37 PM.

October 10th, 2008, 12:59 PM	#9
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	all I got to say is automatics and mustangs don't go together. you car is probably pissed at you for forcing a slushbox into it's unsuspecting tunnel. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

October 10th, 2008, 02:26 AM	#4
78mach1 Hardcore Enthusiast Join Date: Oct 2007 Location: utah Posts: 1,365 iTrader: 0 reviews	your car was a manual right?......did you remove the pilot bushing in the back of the crank before you assembled all this? that would be your problem, i hope you didnt bend your flexplate.

October 10th, 2008, 11:15 AM	#6
78mach1 Hardcore Enthusiast Join Date: Oct 2007 Location: utah Posts: 1,365 iTrader: 0 reviews	well then everything should have fit together nicely. is there any noise?....or just a vibration?

October 12th, 2008, 07:01 PM	#15
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	Take your old flywheel in and have the flexplate balanced to match the flywheel and you should be set. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

October 13th, 2008, 04:00 AM	#17
78mach1 Hardcore Enthusiast Join Date: Oct 2007 Location: utah Posts: 1,365 iTrader: 0 reviews	this is off topic but........should have went for the OD.....=P

October 14th, 2008, 02:43 AM	#19
78mach1 Hardcore Enthusiast Join Date: Oct 2007 Location: utah Posts: 1,365 iTrader: 0 reviews	hahah you can build a hell of a AOD with 1k. you can take a stock AOD, change out the valve body, (or drill it like i did), transgo kit, hi-rev kit, sonnex boost valve, hardened input shaft, a good servo, and it will be a damn good street strip trans for a decent price. or go all out and replace the clutch packs, along with the forward drum and the sun shell. then its bullet proof.

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