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TCI Automotive 399753 LS1 Engine to GM Auto Transmission Adapter

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TCI Automotive 399753 LS1 Engine to GM Auto Transmission Adapter
TCI Automotive 399753 LS1 Engine to GM Auto Transmission Adapter
TCI Automotive 399753 LS1 Engine to GM Auto Transmission Adapter

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Details

Reviews

Q & A

What's in the Box

If you want to bolt a TH350, TH400, Powerglide, and 700R4 transmission up to your LS-Series engine, you need this kit. The spacer properly positions the flexplate and supports the converter hub. For Turbo 350, Turbo 400, and 700R4 transmission application.

SFI 29.1 approved. Dual bolt patterns: stock LS-Series and small GM bolt pattern.

Kit includes:

  • dual bolt pattern SFI rated flexplate
  • flexplate spacer
  • flexplate to crankshaft bolts
  • instructions

Note: Requires a 10-1/2" bolt circle converter.

Notes

  1. Fits internally balanced Chevy 4.8, 5.3, 5.7, 6.0 LS1/LS6-series V8 engines.
  2. Flexplates are .035" thicker than stock and the starter ring is welded to both sides of the flexplate for additional strength. Constructed from a high tensile strength material these flexplates resist elongation and cracking. All 168 tooth flexplates are sized for stock 3/8" mounting bolts and can be easily drilled for 7/16" diameter high performance torque converter applications and are SFI 29.1 approved.

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Product Q&A

5 questions : 5 answers

1 answers

will this work with a 10inch converter? I have a ls1 turbo with a powerglise and a 10inch converter is this the kit i need?

pete123
san jose ca
December 09, 2014

will this work with a 10inch converter? I have a ls1 turbo with a powerglise and a 10inch converter is this the kit i need?

Answers

December 10, 2014
EricM
This flexplate will work with the stock LS converter or a 10 ½” bolt circle which the smaller diameter GM series. You will need to verify the bolt circle on your converter to confirm fit. Bolt circle is measured from center of converter to the center of the mounting hole times 2.
1 answers

I have a 2000 gen III LQ9 6.0 with the long snout crank, will this work or is this just for the short snout crank?

September 23, 2011

I have a 2000 gen III LQ9 6.0 with the long snout crank, will this work or is this just for the short snout crank?

Answers

September 28, 2011
John
This adapter kit puts the common 350, 400, and 700R4 trans behind the later LS series engines. In the early LS there was a long snout crank that presents problems and from research it indicates that the long snout cranks currently are not adaptable to the T5 transmissions without major modifications or swap over of the crank to the short snout crank. Using this kit will also present problems when trying to use with the long snout cranks from 1999 and possibly early 2000. You may want to check with TCI direct or possibly TD Performance Products. Visit our website regularly for any updates in product availability or information.
1 answers

i have a L92/Ls3 truck engine, will i need this to mate my 700r4 to it?

August 16, 2011

i have a L92/Ls3 truck engine, will i need this to mate my 700r4 to it?

Answers

August 17, 2011
Jason
THIS KIT ADAPTS A TH350, TH400, AND 700R4 TO AN LS-SERIES MOTOR. INCLUDES: DUAL BOLT PATTERN SFI RATED FLEXPLATE FLEXPLATE SPACER FLEXPLATE TO CRANKSHAFT BOLTS INSTRUCTIONS BJB 01/29/08 INSTALL GUIDE: -SLIDE THE SPACER THROUGH THE BACKSIDE OF THE FLEX PLATE -BOLT THE FLEX PLATE TO THE CRANKSHAFT (WHICH SANDWICHES THE SPACER) USING THE SUPPLIED FLEXPLATE BOLTS -THE SPACER DOES NOT AFFECT THE ALIGNMENT OF THE FLEX PLATE; AN OEM LSx STARTER WILL WORK; NO AFTERMARKET STARTER IS REQUIRED
1 answers

Why do I need your flex plate when I already have the stock one ?

Geb
Payson, az
June 07, 2011

Why do I need your flex plate when I already have the stock one ?

Answers

June 10, 2011
John
This is an LSI to Turbo 350, 400, or 700R transmission and the kit includes a special adapter to support the converter hub. It slides into the special flex plate before the flex plate is bolted to the crankshaft with the included bolts. The adapter also centers the flex plate for perfect alignment and the flex plate is dual pattern for different converters.
1 answers

do I need a special converter or will any th400 converter work

jay
il
May 24, 2015

do I need a special converter or will any th400 converter work

Answers

May 26, 2015
Eric
Expert
You will need a TH350/TH400 torque converter with a 10 1/2" bolt pattern to work with this flexplate. Many of the TH400 torque converters have a 11 1/2" bolt pattern so be sure to measure your converter.
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