TCI Flexplate to Yank Converter: Ok?
10-06-2006, 06:56 PM
#1
10 Second Club
Thread Starter
iTrader: (15)
Join Date: Nov 2001
Location: St. Michael, MN.
Posts: 4,519
Likes: 0
Received 0 Likes
on
0 Posts
TCI Flexplate to Yank Converter: Ok? I'm in need a new flexplate and just ordered the TCI SFI Flexplate to replace the stock unit. I know there were issues with powdercoating causing the bolts to come loose, but they switched to a e-coating so hopefully that's a thing of the past.
My real concern is with the diameter size of the holes on the flexplate for both the converter and crank. I have read and seen posted pics where they are too big compared to the stock metric bolts. Has anyone had a long-term problem with this?
I'm worried that the converter will slip and cause the holes to stretch out.
I ask because the holes on my stock flexplate were drilled out to accomodate the bigger bolts on my previous converter; TCI 3800. No problem until I switched back to a Yank converter with the smaller, stock metric bolts. The bolts were torqued to spec with lock-tite and have loosened up several times to the point the flexplate holes stretched to an oblong shape rendering the flexplate useless.
Any feedback is appreciated.
My real concern is with the diameter size of the holes on the flexplate for both the converter and crank. I have read and seen posted pics where they are too big compared to the stock metric bolts. Has anyone had a long-term problem with this?
I'm worried that the converter will slip and cause the holes to stretch out.
I ask because the holes on my stock flexplate were drilled out to accomodate the bigger bolts on my previous converter; TCI 3800. No problem until I switched back to a Yank converter with the smaller, stock metric bolts. The bolts were torqued to spec with lock-tite and have loosened up several times to the point the flexplate holes stretched to an oblong shape rendering the flexplate useless.
Any feedback is appreciated.
10-06-2006, 07:16 PM
#2
9 Second Club
iTrader: (17)
Join Date: Nov 2002
Location: New Braunfels ,Tx
Posts: 4,997
Likes: 0
Received 0 Likes
on
0 Posts
I just did this last night. I did some research and TCI has a new coating on the flexplate. So I used the ARP bolts TQed to 75 #'s and used all 6 mounting bolts for the Yank.
10-06-2006, 07:21 PM
#3
10 Second Club
Thread Starter
iTrader: (15)
Join Date: Nov 2001
Location: St. Michael, MN.
Posts: 4,519
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the response. Can I use the stock bolts for both the crank and converter? Mine is also a 6-bolt converter. I assume the pre-drilled holes in the flexplate just lined up the converter.
10-06-2006, 08:56 PM
#4
9 Second Club
iTrader: (17)
Join Date: Nov 2002
Location: New Braunfels ,Tx
Posts: 4,997
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DrkPhx
Thanks for the response. Can I use the stock bolts for both the crank and converter? Mine is also a 6-bolt converter. I assume the pre-drilled holes in the flexplate just lined up the converter.
The TCI flex plate comes with new stock replacements. I chose ARP!
Yes!
10-06-2006, 09:20 PM
#6
9 Second Club
iTrader: (17)
Join Date: Nov 2002
Location: New Braunfels ,Tx
Posts: 4,997
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DrkPhx
I found the ARP part # for the converter bolts, do you have the # for the crank bolts?
I have it written down @ the shop and Im @ work right now 
10-09-2006, 06:29 AM
#7
FormerVendor
Join Date: Feb 2002
Location: Falkner, MS
Posts: 430
Likes: 0
Received 0 Likes
on
0 Posts
Hi DrkPhnx,
We use 1/2" diameter holes in our LS1 flexplate. This is the same as the hole size in the OE flexplate, with the exception of the one elongated hole that's found in the stock stuff. This allows plenty of room for the larger diameter 7/16" mounting bolts that are used in most of our high performance torque converters. As long as the bolt heads on your particular torque converter have enough grip area (at least the same amount as stock), you'll be fine. I prefer the larger diameter 7/16" mounting bolts, because of the additional clamping load and head grip area.
Kevin
We use 1/2" diameter holes in our LS1 flexplate. This is the same as the hole size in the OE flexplate, with the exception of the one elongated hole that's found in the stock stuff. This allows plenty of room for the larger diameter 7/16" mounting bolts that are used in most of our high performance torque converters. As long as the bolt heads on your particular torque converter have enough grip area (at least the same amount as stock), you'll be fine. I prefer the larger diameter 7/16" mounting bolts, because of the additional clamping load and head grip area.
Kevin
