More 8 bolt flexplate questions

[SIZEMOREMK]

I need an 8 bolt flexplate for our stock converter.

I have searched quite a bit on the flexplates, but I am still not sure what I need.

I have seen some threads where some flexplates had a different depth, others where the bolts holes didn't correctly line up on the crank, and others that needed holes enlarged.

Has anyone ordered one recently that fit the crank correctly and had the pattern for the stock converter?

I don't like the idea of drilling into flexplates.

[RoyLPita]

I was able to get one from a Mustang at a salvage yard.

[babbage]

ADTR has the correct units

http://www.adtr.net/store/index.php?route=product/product&path=73_78&product_id=218

[SIZEMOREMK]

ADTR has the correct units

http://www.adtr.net/store/index.php?route=product/product&path=73_78&product_id=218

Have you used this unit?

That looks a lot like the one some folks had trouble with.,

[Zack]

The flexplates some had trouble with most likely came off of an 05+ Auto Mustang, which will not work.

[chief455]

I read extensively on this on svt - many auto swaps done on Cobras. That plate linked is what they use. JW the wheel also has an 8 bolt plate.

[babbage]

Have you used this unit?

That looks a lot like the one some folks had trouble with.,

No but Chris (ADTR) knows his stuff. I got mine from Triple threat, now I just need a good short block to bolt to it... ;)

[SIZEMOREMK]

Ok, I found what I hope is the right one on amazon.

The PAX units are made by PRW from what I found around the boards.

So PRW 1828111 should equal PAX28111

I ordered this one:
http://www.amazon.com/gp/product/B004L2UM2Y/ref=oh_aui_detailpage_o00_s00? ie=UTF8&psc=1

I'll report back if it fits or not.

I seen here in the forums where there were some bolt hole issues on some of the PRW units, I also see where the PAX units had similar issues in the reviews on summit's website.

Hope I get lucky!

[MOTOWN]

I have that exact flexplate, fits perfectly

[chief455]

Ok, I found what I hope is the right one on amazon.

The PAX units are made by PRW from what I found around the boards.

So PRW 1828111 should equal PAX28111

I ordered this one:
http://www.amazon.com/gp/product/B004L2UM2Y/ref=oh_aui_detailpage_o00_s00? ie=UTF8&psc=1

I'll report back if it fits or not.

I seen here in the forums where there were some bolt hole issues on some of the PRW units, I also see where the PAX units had similar issues in the reviews on summit's website.

Hope I get lucky!
nice research!
I'm going to order mine now, thanks!
even less at autoplicity:
Sub-Total: $77.88 Shipping: $8.00 Order Total: $85.88

[SIZEMOREMK]

If that one don't fit right with misaligned bolt holes and such, there may be another option from B&M.

First I called B&M and they couldn't tell the specs of the unit and that it was discontinued. There are, however, quite a few online sources that claim they have it in stock.

Then I called Summit and asked for the converter pattern. They said it may take a day or so to find the info, but they called back today after they got one in-hand to measure.

According to the guy that measured it at Summit, the B&M 50341 unit is suppose to have both 10 5/8 and 11 3/8 converter patterns.

It is here:
http://www.summitracing.com/parts/bmm-50341
Note the picture is not right, but several other pics of this part number look different:

Here's another pic of the same part number:
http://www.amazon.com/50341-Chromoly-Flexplate-Modular-Engine/dp/B007T413OW

Neither of the pics I found look to have the smaller 10 5/8 pattern in the pics, but the guy that had one in hand said that is the measurement.

If the PRW unit I have is messed up, I may try this one.

[RacerX]

If the bolt holes don't line up, rotate the flexplate (with the crankshaft stationary) until they do line up. :D

[SIZEMOREMK]

If the bolt holes don't line up, rotate the flexplate (with the crankshaft stationary) until they do line up. :D

Hey, RacerX, do you recall which flexplate you posted a pic of showing a difference in depth in relation to the stocker?

Do you know if that difference caused an issue?

Thanks!

[woodytxp71]

SIZEMOREMK. Hope this helps. I used one from Rock Auto Part #F249 for a 5.4. Only after going round and round with performance auto for a month with a defective P.A.W. Flexplate. (spacing was way off) I had my trans and converter out 12 times thinking I had something misconbubulated lol. I was told sorry no refund or new flexplate. If I remember correctly the rock auto f249 has holes for both converters. I Also I just checked ebay under 5.4 flexplates (all 8 bolt I think) alot with multi converter holes. Hope this helps Walt

[chief455]

SIZEMOREMK. Hope this helps. I used one from Rock Auto Part #F249 for a 5.4. Only after going round and round with performance auto for a month with a defective P.A.W. Flexplate. (spacing was way off) I had my trans and converter out 12 times thinking I had something misconbubulated lol. I was told sorry no refund or new flexplate. If I remember correctly the rock auto f249 has holes for both converters. I Also I just checked ebay under 5.4 flexplates (all 8 bolt I think) alot with multi converter holes. Hope this helps Walt
what spacing was way off?
torque convertor holes for MM mounting?

[chief455]

I have that exact flexplate, fits perfectly
do you have the stock MM bolt pattern on your convertor?
I'm wondering if this is the disconnect - my aftermarket convertor has 2 bolt patterns, MM and regular CV I think?

[MOTOWN]

do you have the stock MM bolt pattern on your convertor?
I'm wondering if this is the disconnect - my aftermarket convertor has 2 bolt patterns, MM and regular CV I think?

Yeah my Circle D has dual bolt patterns as well , the PRW flex plate is also what Chris from Circle D sells as well.

[chief455]

Yeah my Circle D has dual bolt patterns as well , the PRW flex plate is also what Chris from Circle D sells as well.
from DirtyDog convertors: Marauder size
11.25 refers to the converter diameter meaning it will have 4 holes on a 10 - 5/8 bolt pattern
Crown Vic Torque Converter Bolt Circle:11.400 in

[MOTOWN]

I have the 258MM 10 1/4" converter , the flex plate also fits stock bolt pattern converters.

[chief455]

SIZEMOREMK. Hope this helps. I used one from Rock Auto Part #F249 for a 5.4. Only after going round and round with performance auto for a month with a defective P.A.W. Flexplate. (spacing was way off) I had my trans and converter out 12 times thinking I had something misconbubulated lol. I was told sorry no refund or new flexplate. If I remember correctly the rock auto f249 has holes for both converters. I Also I just checked ebay under 5.4 flexplates (all 8 bolt I think) alot with multi converter holes. Hope this helps Walt
still wondering what spacing was way off? did you have a CV converter with the large bolt pattern?
You know, with any convertor/flexpate, especially aftermarket stuff, you need to put the convertor fully into the transmission, and slide out ~ 1/8" - any space between the mounts and flexplate at that point will need to have spacers take up. I have had to slide grade 8 washers between convertor and plate a dozen times. Is this the spacing you mean?


I have the 258MM 10 1/4" converter , the flex plate also fits stock bolt pattern converters.

Roger, that;)
this flexplate has enough holes to fit many convertors - should not be a crank hole or convertor hole issue:confused:
164 tooth flexplate internal balance
Features 10.5 in. and 11.5 in. Ford bolt patterns, and 10.75 in. and 11.5 in. GM bolt patterns.
Meets SFI 29.1 safety ratings
Available in either 6 bolt or 8 bolt crankshaft bolt patterns
6 bolt configuration commonly found on all Crown Victorias and Panthers, most Mustang GTs 96-04 and Mach 1s
8 bolt configuration commonly found on Mustang Cobras and in some 5.4 truck motors.

[woodytxp71]

[QUOTE=chief455;1434671]what spacing was way off?
torque convertor holes for MM mounting?[/QUOTE

At the crankshaft. In other words when the flexplate was bolted up it was about 3/8" forward. When I would instal the starter it would bind. The performance auto flexplate I purchased from them was in a batch of defects and was supposed to be destroyed per them. (But would not exchange it or refund me). I will see if I can find my original post with pictures and link it here.

[woodytxp71]

what spacing was way off?
torque convertor holes for MM mounting?

I hope I paste this pic correctly.if not oops lol Note the area of the mounting holes to crank
http://www.mercurymarauder.net/forums/showthread.php?t=92616

[woodytxp71]

still wondering what spacing was way off? did you have a CV converter with the large bolt pattern?
You know, with any convertor/flexpate, especially aftermarket stuff, you need to put the convertor fully into the transmission, and slide out ~ 1/8" - any space between the mounts and flexplate at that point will need to have spacers take up. I have had to slide grade 8 washers between convertor and plate a dozen times. Is this the spacing you mean?



Roger, that;)
this flexplate has enough holes to fit many convertors - should not be a crank hole or convertor hole issue:confused:
164 tooth flexplate internal balance
Features 10.5 in. and 11.5 in. Ford bolt patterns, and 10.75 in. and 11.5 in. GM bolt patterns.
Meets SFI 29.1 safety ratings
Available in either 6 bolt or 8 bolt crankshaft bolt patterns
6 bolt configuration commonly found on all Crown Victorias and Panthers, most Mustang GTs 96-04 and Mach 1s
8 bolt configuration commonly found on Mustang Cobras and in some 5.4 truck motors.

Chief455 did you see the picture? I used an edge 10.5" 3500 stall converter. It Scared the crap out of me the first time I nailed it lol. A friend of mine had the exact flexplate we test fit it on mine and it fit perfect. Thanks for your suggestions I may try spacer. Didn't mean to hijack this thread. Walt

[chief455]

[QUOTE=chief455;1434671]what spacing was way off?
torque convertor holes for MM mounting?[/QUOTE

At the crankshaft. In other words when the flexplate was bolted up it was about 3/8" forward. When I would instal the starter it would bind. The performance auto flexplate I purchased from them was in a batch of defects and was supposed to be destroyed per them. (But would not exchange it or refund me). I will see if I can find my original post with pictures and link it here.
so it was in isolated instance, thus others are running this same plate without issue. mystery solved!

Chief455 did you see the picture? I used an edge 10.5" 3500 stall converter. It Scared the crap out of me the first time I nailed it lol. A friend of mine had the exact flexplate we test fit it on mine and it fit perfect. Thanks for your suggestions I may try spacer. Didn't mean to hijack this thread. Walt
thanks for showing the pics, makes sense. 3500 convertors are the bomb!!
this detail from you, and MOTOWN should help the op and anyone reading decide on an 8 bolt flexplate.

[SIZEMOREMK]

So the one I got off Amazon came in and we believe it might work out OK.

It is the PRW 1828111 Xtreme Duty SFI-Rated 164 Teeth Steel Flexplate for Ford 4.6L DOHC 1992-06

http://www.amazon.com/gp/product/B004L2UM2Y/ref=oh_aui_detailpage_o00_s00? ie=UTF8&psc=1

The 8 bolt crank seems to line up fine on this particular one, though there were reports of a defective batch where some were not correct.

The converter pattern looks like 10.5" vs 10 5/8" so the holes will need to be opened up just a little to accommodate the factory converter.

There is a difference in offset, or depth of the flexplate vs factory. There is about 1/8" difference, "thinner," or closer to the block and/or starter gear.
The one woodytxp had from the bad batch, says his was more like 3/8" too thin, causing bind with the starter.

As RacerX shows here:
http://www.mercurymarauder.net/forums/showpost.php?p=1376976&postcount=5

Does anyone know if the 8 bolt crank has any difference vs the 6 bolt in how far it extends past the rear of the block?

Shop says they're pretty sure they can work with it.

I think my biggest concern at the moment is if that 1/8th may interfere with the starter? I guess if there were, the starter could be shimmed out?

[TraV8]

I am just running into this issue myself. What did you end up doing to solve your issue?

[SIZEMOREMK]

What exactly is your issue?

My shop ended up using that flexplate but I'm not 100% sure if they ended up having to open up the converter holes or not. I do not think they had to shim the starter.

[TraV8]

I dont have a problem yet haha was just trying to avoid any issues with the flex plate. I ordered the one off of amazon yesterday so if you say that is the one that you used that makes me feel better!
Thanks!