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converter bolt pattern diffrences(help)

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Posted by: newguy

1993 mark VIII,trying to use 02 mustang converter cause its smaller,,I compared my stock converter to the stang conv.and there is a smaller bolt pattern on the stang conv.does my flywheel have both bolt paterns to bolt this conv. right on or do I need another flywheel and if I do which one is it??
my stock converter is about 12 and the stang converter is about 11 and if I am correct this should give me a bigger stall I am correct in this matter?about 2300-2500??

Posted by: dRock95MarkVIII

The '02 Mustang GT converter is 11.25" and uses the flexplate drilled for the 11.25 and 6 bolt crank

But, your '93 Mark VIII's converter should also have the 11.25" converter and flexplate. That is unless it was added in a later year, but I'm pretty sure all Mark VIIIs had the 11.25". Wouldn't make sense to have a 12" with a DOHC, revs too high.

To swap in a 12" one would have to drop the trans, change out the TC and change the flexplate (though some of the 11.25" plates have been drilled for the 12" too..)
Vice versa to swap an 11.25" in favor of a 12"

The 11.25" does have a higher effective stall speed because of the higher k factor, and greater torque multiplication. Because of it's smaller size the 11.25" can also be safely spun to higher rpms before balooning, which is perfectly suited for the high-revving DOHC powerplant.

Posted by: Markviiiedrea

I have a mustang stall and I had to drill new holes to get it to work with my flex plate.

Posted by: AbrahamLincoln

tccoa says that 99+ mustangs are 8 bolt mark viiis are 6

Posted by: newguy

so I cannot use this converter at all

if thats the case,,anybody know for sure??

Posted by: AbrahamLincoln

Quote:

Originally Posted by newguy

so I cannot use this converter at all

if thats the case,,anybody know for sure??

im a little confused here, ive searched and found that others have used late model gt trans in there marks... i dunno check out the tranny 101 at tccoa.com

Posted by: 93' Blue on blue

What are you two confused about? I just read the 101 article, looks to me that you need to get a different flex plate ( or re drill like markviiiedrea did)

Im no expert, haven't done it yet. Read the article and wait for those who have done it to chime in.

Posted by: 93' Blue on blue

Ok, im confused now too - Lol.

In the 101 article it states that 99 up stangs are 8 bolt flex plates, then you read down and it high lights windsor and Cobra engines as having the 8 bolt cranks.???

Maybe a mistake?

Posted by: 93' Blue on blue

Ah...... ok! i think i understand.

The 99 -04 stangs came with two different versions of the same engine!!!

A windsor version... and a romeo version.

Very different - some parts not interchangeable.

One had a 6 bolt crank, the other had an 8.

They explain it here: (all very confusing, with ford switching back and forth)

http://www.mustangforums.com/m_4523011/tm.htm

So, i guess you just gotta get the torque converter etc. for the 6 bolt application, right?

Read post 17 of that link - very confusing! (although informative) I think you guys need the 6 bolt 'romeo' version stuff. Man, i gotta headache! Lol.

I was just on a Mustang parts site, they do indeed list 6 and 8 bolt flywheels and stuff for 99 - 04 Mustang GTs

http://www.americanmuscle.com/99-04-...flywheels.html

Posted by: dRock95MarkVIII

1999-2000 Mustang GTs used an 8 bolt crank. That's because production capacity at Romeo was limited so Windsor engines were used. All Windsors use the 8 bolt crank as their production is mostly for trucks. '96-'98 and '01-'04 GTs used the 6 bolt.

Our Mark VIII engines had a 6 bolt crank.

But, that's irrelevant. 6 bolt versus 8 bolt makes no difference for the torque converter - only the flexplate. The same 11.25" TC is used with with either crank. So to use one on either crank it's just a matter of using the correct flexplate.

If for some reason you do need to change the flexplate to use this new TC, just remember 6 bolt. They are inexpensive. I'm unsure why you would have to, though - I purchased a new 'Mark VIII' converter from Ford and it was a match to the new 11.25" (10.5" bolt pattern) Marauder/Mustang/Mark flexplate I bought.

BTW, the Mustang converter has nearly the same K factor and thus effective stall. Changing to it isn't really a performance upgrade, but you are still starting out with a newer TC. If you order a 11.25" TC service assembly for either the Mark or the 'Stang from the dealer you will get the same part

Posted by: AbrahamLincoln

Quote:

Originally Posted by 93' Blue on blue

Ah...... ok! i think i understand.

The 99 -04 stangs came with two different versions of the same engine!!!

A windsor version... and a romeo version.

Very different - some parts not interchangeable.

One had a 6 bolt crank, the other had an 8.

so i guessing you can get a 6 bolt trans to swap in then instead of having to mess with it? but it doesnt seem complicated if you just reuse your mark job or another 6 bolt swapped out if you buy one with an 8 bolt.

Posted by: AbrahamLincoln

Quote:

Originally Posted by dRock95MarkVIII

1999-2000 Mustang GTs used an 8 bolt crank. That's because production capacity at Romeo was limited so Windsor engines were used. All Windsors use the 8 bolt crank as their production is mostly for trucks. '96-'98 and '01-'04 GTs used the 6 bolt.

Our Mark VIII engines had a 6 bolt crank.

But, that's irrelevant. 6 bolt versus 8 bolt makes no difference for the torque converter - only the flexplate. The same 11.25" TC is used with with either crank. So to use one on either crank it's just a matter of using the correct flexplate.

If for some reason you do need to change the flexplate to use this new TC, just remember 6 bolt. They are inexpensive. I'm unsure why you would have to, though - I purchased a new 'Mark VIII' converter from Ford and it was a match to the new 11.25" (10.5" bolt pattern) Marauder/Mustang/Mark flexplate I bought.

BTW, the Mustang converter has nearly the same K factor and thus effective stall. Changing to it isn't really a performance upgrade, but you are still starting out with a newer TC. If you order a 11.25" TC service assembly for either the Mark or the 'Stang from the dealer you will get the same part

ok thanks for clearing that up!