Flexplate converter bolt hole size adapter

Transmission to Rear-end

Moderator: Team

Post Reply
User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Flexplate converter bolt hole size adapter

Post by BOOT » Mon Sep 29, 2014 10:13 pm

Ok got a flexplate that has 7/16 holes and a converter with welded on nuts that are 3/8. Short of pulling the trans looking for a quick fix. Tried looking for some kind of washer, spacer, shim, shouldered bolt on McMaster carr but nothing that looks like it'll work. Tried a few other searches but figured I'd ask if anyone knows another place that would have something.
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Flexplate converter bolt hole size adapter

Post by BOOT » Tue Sep 30, 2014 9:26 am

Or am I worried about nothing?
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

sidestep
New Member
New Member
Posts: 42
Joined: Mon Aug 25, 2014 12:45 pm
Location: Montara Ca

Re: Flexplate converter bolt hole size adapter

Post by sidestep » Tue Sep 30, 2014 10:59 am

How about pressure plate bolts, they are 3/8 thread and usually are shouldered (sbc ) maybe more than 7/16 but material can removed. Just a thought

In-Tech
Guru
Guru
Posts: 1510
Joined: Wed Apr 21, 2010 4:35 am

Re: Flexplate converter bolt hole size adapter

Post by In-Tech » Tue Sep 30, 2014 5:07 pm

type "Step Washer" in google, I'm sure there is something off the shelf that will do what you want and/or find a guy with a lathe and make some.
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Flexplate converter bolt hole size adapter

Post by BOOT » Tue Sep 30, 2014 5:21 pm

In-Tech wrote:type "Step Washer" in google, I'm sure there is something off the shelf that will do what you want and/or find a guy with a lathe and make some.

Yah was trying to find something that wouldn't cost me $50 an hr, but looking like that might be the only solution.
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

In-Tech
Guru
Guru
Posts: 1510
Joined: Wed Apr 21, 2010 4:35 am

Re: Flexplate converter bolt hole size adapter

Post by In-Tech » Tue Sep 30, 2014 6:10 pm

Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

In-Tech
Guru
Guru
Posts: 1510
Joined: Wed Apr 21, 2010 4:35 am

Re: Flexplate converter bolt hole size adapter

Post by In-Tech » Tue Sep 30, 2014 6:18 pm

ARP 200-8562 step washer, 3/8 ID .443 OD ...7/16 is .4375 but we all know a 7/16 bolt hole is going to be larger. :)

Don't have the dimensions but BHJ also makes them 510-797-6780

Lot's of options :)
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Flexplate converter bolt hole size adapter

Post by BOOT » Tue Sep 30, 2014 6:31 pm

In-Tech wrote:ARP 200-8562 step washer, 3/8 ID .443 OD ...7/16 is .4375 but we all know a 7/16 bolt hole is going to be larger. :)

Don't have the dimensions but BHJ also makes them 510-797-6780

Lot's of options :)

I have the same exact flexplate on my shelf and the holes do measure right about .437, seen a few option that were about the same on McMaster.
Last edited by BOOT on Tue Sep 30, 2014 6:34 pm, edited 1 time in total.
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Flexplate converter bolt hole size adapter

Post by BOOT » Tue Sep 30, 2014 6:33 pm

Thx but doesn't say the od of the step and if I'm gonna get it turned down I can find something local.
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Flexplate converter bolt hole size adapter

Post by BOOT » Tue Sep 30, 2014 6:38 pm

Forgot about a friend with a lathe and asking to see if he's got time.
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Flexplate converter bolt hole size adapter

Post by BOOT » Wed Oct 01, 2014 4:34 pm

Saw some brass tubing that might of worked at local hardware store, would of needed to use a 7/16 and 11/32 slide into that. My friend turned down some 3/8 id and 1/2 od moly tube for me :)
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

geraldtson
New Member
New Member
Posts: 45
Joined: Tue Feb 10, 2015 9:50 pm

Re: Flexplate converter bolt hole size adapter

Post by geraldtson » Wed Mar 18, 2015 9:43 pm

Most on here will probably disagree but i would install all three bolts only a couple threads then center the slop,tighten bolts and forget about it. When installing most stock applications theres always a lot of slop in i always center the slop then tighten never had a problem.If its a racing application with high stall/horsepower/transbrake i would find a bigger shoulder bolt. Also while under car facing engine side of flywheel while all three bolts are started just a few threads turn the torque converter counterclockwise to load the bolts against the flywheel then tighten them. This will have them loaded against flywheel in direction of rotation.Check them now and then but i've never had a problem doing so.I've known many circle track racers stack sometimes as much as three to six flat washers between flywheel and converter lugs to make up for mid engine mounts and not have a problem. Just tighten them and check'em now and then!!

User avatar
BOOT
Guru
Guru
Posts: 1333
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Flexplate converter bolt hole size adapter

Post by BOOT » Sun Apr 05, 2015 2:38 pm

The spacers my friend made worked great
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!

Post Reply