TH400 to LY6 Gen IV
Thread Starter
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
TH400 to LY6 Gen IV I have an LY6 that came without the original flexplate. I plan to mate it to my TH400 and BTE torque converter. Is there an application-specific aftermarket flexplate I should be using or should I get an LY6 original flexplate and use the spacers to support the TC snout?
I'm not opposed to buying an aftermarket flexplate if there's one that will mate right up.
Thanks for any help
I'm not opposed to buying an aftermarket flexplate if there's one that will mate right up.
Thanks for any help
Thread Starter
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
Do you know if the back of the crank on a gen IV is the same as a gen III? In otherwords, could I use an LQ4 flexplate on my LY6 and add the spacer + longer bolts for the TH400 converter? What about a 4.8 or 5.3 flexplate? Are they the same?
Thread Starter
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
After doing some research I was between buying new parts from GM or getting a TCI setup. Here is the breakdown:
I talked to the folks at Summit and also confirmed by searching here that the TCI part number above is correct for adapting to the TH400 and it does in fact include the spacer to support the nose of a TH400 torque converter and the fasteners to attach it to the crank. TCI makes another LSX flexplate 399753 that is NOT correct for this application.
I should also note there are apparently some variations on some of the early LSX crank lengths that I discovered by searching here. Some cranks have spacers between the back of the crank and the flexplate while others have the "spacer" machined into the crank so the overall lenght is longer. I am not sure what applications that applies to - hopefully not mine!
GM Parts To Adapt LSX to TH400
1x 12551367 flexplate for LSX to 4L80E ($87.86)
1x 12563532 spacer for supporting TH400 converter snout ($61.40)
6x 12563533 fasteners for attaching spacer & flywheel (6x$7.95=$47.82)
Quoted by the local stealership. Total is $197.08
Obviously you could get this cheaper buying used parts!
1x 12551367 flexplate for LSX to 4L80E ($87.86)
1x 12563532 spacer for supporting TH400 converter snout ($61.40)
6x 12563533 fasteners for attaching spacer & flywheel (6x$7.95=$47.82)
Quoted by the local stealership. Total is $197.08
Obviously you could get this cheaper buying used parts!
TCI Parts to Adapt LSX to TH400
1x 399754 flexplate for 4L80E includes spacer and fastners ($224.95)
Purchased from Summit Racing. Total is $224.95
I decided to go with the TCI setup because it is not much more, it's stronger, and it's SFI approved. I will however say I prefer the design of the GM spacer since the GM spacer bolts on and the TCI spacer is just a press fit.1x 399754 flexplate for 4L80E includes spacer and fastners ($224.95)
Purchased from Summit Racing. Total is $224.95
I talked to the folks at Summit and also confirmed by searching here that the TCI part number above is correct for adapting to the TH400 and it does in fact include the spacer to support the nose of a TH400 torque converter and the fasteners to attach it to the crank. TCI makes another LSX flexplate 399753 that is NOT correct for this application.
I should also note there are apparently some variations on some of the early LSX crank lengths that I discovered by searching here. Some cranks have spacers between the back of the crank and the flexplate while others have the "spacer" machined into the crank so the overall lenght is longer. I am not sure what applications that applies to - hopefully not mine!
After doing some research I was between buying new parts from GM or getting a TCI setup. Here is the breakdown:
I talked to the folks at Summit and also confirmed by searching here that the TCI part number above is correct for adapting to the TH400 and it does in fact include the spacer to support the nose of a TH400 torque converter and the fasteners to attach it to the crank. TCI makes another LSX flexplate 399753 that is NOT correct for this application.
I should also note there are apparently some variations on some of the early LSX crank lengths that I discovered by searching here. Some cranks have spacers between the back of the crank and the flexplate while others have the "spacer" machined into the crank so the overall lenght is longer. I am not sure what applications that applies to - hopefully not mine!
GM Parts To Adapt LSX to TH400
1x 12551367 flexplate for LSX to 4L80E ($87.86)
1x 12563532 spacer for supporting TH400 converter snout ($61.40)
6x 12563533 fasteners for attaching spacer & flywheel (6x$7.95=$47.82)
Quoted by the local stealership. Total is $197.08
Obviously you could get this cheaper buying used parts!
1x 12551367 flexplate for LSX to 4L80E ($87.86)
1x 12563532 spacer for supporting TH400 converter snout ($61.40)
6x 12563533 fasteners for attaching spacer & flywheel (6x$7.95=$47.82)
Quoted by the local stealership. Total is $197.08
Obviously you could get this cheaper buying used parts!
TCI Parts to Adapt LSX to TH400
1x 399754 flexplate for 4L80E includes spacer and fastners ($224.95)
Purchased from Summit Racing. Total is $224.95
I decided to go with the TCI setup because it is not much more, it's stronger, and it's SFI approved. I will however say I prefer the design of the GM spacer since the GM spacer bolts on and the TCI spacer is just a press fit.1x 399754 flexplate for 4L80E includes spacer and fastners ($224.95)
Purchased from Summit Racing. Total is $224.95
I talked to the folks at Summit and also confirmed by searching here that the TCI part number above is correct for adapting to the TH400 and it does in fact include the spacer to support the nose of a TH400 torque converter and the fasteners to attach it to the crank. TCI makes another LSX flexplate 399753 that is NOT correct for this application.
I should also note there are apparently some variations on some of the early LSX crank lengths that I discovered by searching here. Some cranks have spacers between the back of the crank and the flexplate while others have the "spacer" machined into the crank so the overall lenght is longer. I am not sure what applications that applies to - hopefully not mine!
On The Tree
Joined: Aug 2010
Posts: 104
Likes: 0
From: Warren Michigan
http://www.jegs.com/i/J-W-Performanc...oductId=810083
I just saw a magazine article this week. Another company has brought a adapter/flywheel combination to the market for ls1-th400 applications....the pictures looked like a nice piece, but I forget the company name....Ill look tomorrow.
I just saw a magazine article this week. Another company has brought a adapter/flywheel combination to the market for ls1-th400 applications....the pictures looked like a nice piece, but I forget the company name....Ill look tomorrow.
