aod to c4 automatic conversion

blu87 · July 21st, 2009, 10:17 PM

I have a 1990 coupe v8 it had an aod in it that went out and I converted it to a c4 and I am having a ton of problems. I had to change the fly wheel so that my tourque converter would bolt up and now when you turn the key the car will not start. the starter will spin when you jumper it but it will not work by the key. it sounds if the starter is not touching the fly wheel. can some one help

Thank you Kindly

1slo5.0 · July 22nd, 2009, 01:26 AM

Sounds like you have a 157 tooth flywheel and a 164 tooth bellhousing.

89LX347 · July 22nd, 2009, 07:29 PM

did you put the dust plate back on? (thin plate in between bell and motor) if not then you will likely have the wrong spacing and your starter will not engage with the starter. i think darrell is right though. since you have to change flexplates, you have to change bell housings

1slo5.0 · July 22nd, 2009, 07:58 PM

The AOD flexplate should have worked. You must have got the wrong converter. There are a couple variations with C4 converters. I use AOD flexplates on all of my 5 liter 50 oz C4 conversions.

July 21st, 2009, 10:17 PM	#1
blu87 Newbie Join Date: Apr 2006 Posts: 3	aod to c4 automatic conversion I have a 1990 coupe v8 it had an aod in it that went out and I converted it to a c4 and I am having a ton of problems. I had to change the fly wheel so that my tourque converter would bolt up and now when you turn the key the car will not start. the starter will spin when you jumper it but it will not work by the key. it sounds if the starter is not touching the fly wheel. can some one help Thank you Kindly

July 22nd, 2009, 01:26 AM	#2
1slo5.0 Zippee is my step sister. 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 10,353	Sounds like you have a 157 tooth flywheel and a 164 tooth bellhousing. __________________ Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....

July 22nd, 2009, 07:29 PM	#3
89LX347 Hardcore Enthusiast Join Date: Apr 2007 Posts: 1,251	did you put the dust plate back on? (thin plate in between bell and motor) if not then you will likely have the wrong spacing and your starter will not engage with the starter. i think darrell is right though. since you have to change flexplates, you have to change bell housings __________________ I believe in art when it is not seen. I believe in music when it is not audible. I believe in God when He is silent.

July 22nd, 2009, 07:58 PM	#4
1slo5.0 Zippee is my step sister. 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 10,353	The AOD flexplate should have worked. You must have got the wrong converter. There are a couple variations with C4 converters. I use AOD flexplates on all of my 5 liter 50 oz C4 conversions. __________________ Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....

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