AOD to C4... What do I need??????

jz_mustang50 · 10-02-2001, 09:54 PM

What is involved with changing out a AOD to a C4 in a 1991 Mustang GT? What do I need beside the transmission? Do i need a new flywheel, driveshaft, crossmember, shifter, starter ect... TELL ME WHAT I NEED. PLEASE, SOMEONE WHOS DONE THE WORK THEMSELVES. I'd also like to know who is a good place to go through. The transmission will eventually getting about 550 flywheel hp, so I need a built one.

Thanks!!

------------------
Joe Zemaitis, Grand Rapids Michigan

1991 Mustang GT. Mods to date: 4.10 rear end, new POSI, aluminum driveshaft, AOD w/ shift kit, 2 1/2 off road h-pipe, 2 1/2 flowmasters and 2 1/2 tail pipes. Electric fan, Removed air pump and egr tube. Jegs brand upper and lower adjustable control arms. Removed back seats. Hoosier Quick Time Pro 27x10.5x15 and bolt on subframes soon to be welded. Everything else is STOCK. Totally stock ENGINE. 14.29@96 with 130k miles.

macx · 10-02-2001, 11:05 PM

The trans mount bolts are exactly 2" farther forward. You need the bellhousing bolts, flex plate, converter, dipstick & tube, block plate (thin plate between engine & trans) and the shifter. The AOD yoke should fit the c-4, and the driveshaft should even be the right length! For good tranny builders, try www.artcarr.com, www.levelten.com, hughes transmissions for a couple. For that power, you'll need the gearset with the extra pinions as well as the normal hd clutches etc.

macx · 10-02-2001, 11:07 PM

Oops! For flexplate, you need to make sure you have a 50 oz imbalance (later models 302) versus the 28 oz imbalance (earlier models) so you might have to find a diff. plexplate. Probably good to get an aftermarket one anyway for that power. You could reuse your starter if you get a flexplate with the same number of teeth.

10-03-2001, 07:51 AM

Make sure you know what you want. If you want a lot of clearance you should get the small bellhousing C-4. With the small bell C-4 you will need a 157 tooth flexplate (50 oz). B&M makes flexplates with both 10 1/2 and 11 7/16 with 157 teeth and a 50 oz imbalance and so does TCI. Make sure that when you get a converter you know what bolt spacing you have for the converter studs (there is 9 something ", a 10.5 ", and an 11 7/16). For the small bellhousing you can use a T-5 shim plate (goes in between motor and bellhousing).

If you use the big bell C-4 you can use the AOD flexplate, but make sure the converter you buy has the 11 7/16 bolt spacing. Other than that everything works (drive shaft, cross-member, etc).

You will need a different shifter though. My buddy actually used the B&M Pro Ratchet shifter for AOD/C-4 for a Mustang.

Hope I helped

Jason

jz_mustang50 · 10-03-2001, 12:16 PM

Hey, thanks for the info... Where should I buy my C4 from, and can they also sell me all the extras to make it work? What do you think this stuff would cost? I saw a TCI trans in Jegs or Summit. Are those any good?

Thanks

------------------
Joe Zemaitis, Grand Rapids Michigan

1991 Mustang GT. Mods to date: 4.10 rear end, new POSI, aluminum driveshaft, AOD w/ shift kit, 2 1/2 off road h-pipe, 2 1/2 flowmasters and 2 1/2 tail pipes. Electric fan, Removed air pump and egr tube. Jegs brand upper and lower adjustable control arms. Removed back seats. Hoosier Quick Time Pro 27x10.5x15 and bolt on subframes soon to be welded. Everything else is STOCK. Totally stock ENGINE. 14.29@96 with 130k miles.

10-04-2001, 07:22 AM

I know that Dynamic makes good valve bodies and other components. Right now my buddy has a Regular C-4 with a Dynamic valve body with a Coan converter.

I think Performance Automatic makes a pretty good C-4 also. There is a company with a lifetime warranty. All you pay is shipping to get it rebuilt.

Talk to those who are running C-4's around you and find out who has a good transmission shop around your area.

Jason

10-02-2001, 09:54 PM	#1
jz_mustang50 Registered Member Join Date: Sep 2001 Location: Grand Rapids, Michigan, USA Posts: 50	AOD to C4... What do I need?????? What is involved with changing out a AOD to a C4 in a 1991 Mustang GT? What do I need beside the transmission? Do i need a new flywheel, driveshaft, crossmember, shifter, starter ect... TELL ME WHAT I NEED. PLEASE, SOMEONE WHOS DONE THE WORK THEMSELVES. I'd also like to know who is a good place to go through. The transmission will eventually getting about 550 flywheel hp, so I need a built one. Thanks!! ------------------ Joe Zemaitis, Grand Rapids Michigan 1991 Mustang GT. Mods to date: 4.10 rear end, new POSI, aluminum driveshaft, AOD w/ shift kit, 2 1/2 off road h-pipe, 2 1/2 flowmasters and 2 1/2 tail pipes. Electric fan, Removed air pump and egr tube. Jegs brand upper and lower adjustable control arms. Removed back seats. Hoosier Quick Time Pro 27x10.5x15 and bolt on subframes soon to be welded. Everything else is STOCK. Totally stock ENGINE. 14.29@96 with 130k miles.

10-02-2001, 11:05 PM	#2
macx Registered Member Join Date: Oct 1999 Location: Gordonville MO USA Posts: 448	The trans mount bolts are exactly 2" farther forward. You need the bellhousing bolts, flex plate, converter, dipstick & tube, block plate (thin plate between engine & trans) and the shifter. The AOD yoke should fit the c-4, and the driveshaft should even be the right length! For good tranny builders, try www.artcarr.com, www.levelten.com, hughes transmissions for a couple. For that power, you'll need the gearset with the extra pinions as well as the normal hd clutches etc.

10-02-2001, 11:07 PM	#3
macx Registered Member Join Date: Oct 1999 Location: Gordonville MO USA Posts: 448	Oops! For flexplate, you need to make sure you have a 50 oz imbalance (later models 302) versus the 28 oz imbalance (earlier models) so you might have to find a diff. plexplate. Probably good to get an aftermarket one anyway for that power. You could reuse your starter if you get a flexplate with the same number of teeth.

10-03-2001, 07:51 AM	#4
88GT5.013.02 Guest Posts: n/a	Make sure you know what you want. If you want a lot of clearance you should get the small bellhousing C-4. With the small bell C-4 you will need a 157 tooth flexplate (50 oz). B&M makes flexplates with both 10 1/2 and 11 7/16 with 157 teeth and a 50 oz imbalance and so does TCI. Make sure that when you get a converter you know what bolt spacing you have for the converter studs (there is 9 something ", a 10.5 ", and an 11 7/16). For the small bellhousing you can use a T-5 shim plate (goes in between motor and bellhousing). If you use the big bell C-4 you can use the AOD flexplate, but make sure the converter you buy has the 11 7/16 bolt spacing. Other than that everything works (drive shaft, cross-member, etc). You will need a different shifter though. My buddy actually used the B&M Pro Ratchet shifter for AOD/C-4 for a Mustang. Hope I helped Jason

10-03-2001, 12:16 PM	#5
jz_mustang50 Registered Member Join Date: Sep 2001 Location: Grand Rapids, Michigan, USA Posts: 50	Hey, thanks for the info... Where should I buy my C4 from, and can they also sell me all the extras to make it work? What do you think this stuff would cost? I saw a TCI trans in Jegs or Summit. Are those any good? Thanks ------------------ Joe Zemaitis, Grand Rapids Michigan 1991 Mustang GT. Mods to date: 4.10 rear end, new POSI, aluminum driveshaft, AOD w/ shift kit, 2 1/2 off road h-pipe, 2 1/2 flowmasters and 2 1/2 tail pipes. Electric fan, Removed air pump and egr tube. Jegs brand upper and lower adjustable control arms. Removed back seats. Hoosier Quick Time Pro 27x10.5x15 and bolt on subframes soon to be welded. Everything else is STOCK. Totally stock ENGINE. 14.29@96 with 130k miles.

10-04-2001, 07:22 AM	#6
88GT5.013.02 Guest Posts: n/a	I know that Dynamic makes good valve bodies and other components. Right now my buddy has a Regular C-4 with a Dynamic valve body with a Coan converter. I think Performance Automatic makes a pretty good C-4 also. There is a company with a lifetime warranty. All you pay is shipping to get it rebuilt. Talk to those who are running C-4's around you and find out who has a good transmission shop around your area. Jason