LS Crankshaft TH350/TH400/700R4 Torque Converter Adapter Sleeve
LS Crankshaft TH350/TH400/700R4 Torque Converter Adapter Sleeve
Speedway Motors

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#57518346

LS Crankshaft TH350/TH400/700R4 Torque Converter Adapter Sleeve

  • Compatible with GM LS series Xtreme Duty Flexplate with a 4mm thick centerplate
  • Premium steel construction, black painted finish
  • For TH350 or TH400 transmission application
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$30.99

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Product Summary

2004R, 4L60E, 700R4, Powerglide, TH350, TH400

  • Compatible with GM LS series Xtreme Duty Flexplate with a 4mm thick centerplate
  • Premium steel construction, black painted finish
  • For TH350 or TH400 transmission application
  • Small end outside diameter 1.70", big end outside diameter 2.00"
  • Height 1.04", inside diameter 1.47" thru, 1.708-1.706 inside big dia. , .490 deep
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Key Specs

MFG. Part #57518346
BrandSpeedway Motors
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Speedway Motors 57518346 Details

This adapter sleeve will connect a GM LS engine crankshaft to an older GM 2/3/4 speed automatic transmission torque converter. It centers the torque converter hub into the LS cranksaft. Use with flexplate adapter 57534610.

For 1997-07 GM LS1/LS6 engines (up to '09 for LS2) and 4.8/5.3/6.0 truck engines including L33, L59, LM4, LM7, LQ4, LQ9, and LR4. Adapts all of these engines to TH350, TH400, 700R-4, 200-4R, early 4L60 and Powerglide transmissions that originally came behind a non-LS engine (such as a SBC or BBC V8).

Speedway Motors 57518346 Specifications

KEY SPECS
MFG. Part #57518346
BrandSpeedway Motors
GENERAL
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Ratings & Reviews

4.9

40 Reviews

Overall Assessment

Customers highly recommend the product for LS swap builds as it flawlessly mates old transmissions with new motors. The product is lauded for its perfect fit and easy installation, providing added length as needed. It's praised for solving vibration issues and aiding in motor swapping conversions. Warning: some customers found the need for longer bolts for the flywheel or spacers. Quality, affordability, and practicality make this product a favorite for LS conversion projects, repeatedly matching transmissions to LS platforms seamlessly. Majority of customers would certainly re-purchase and recommend.

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4.9

40 reviews

5

38

4

1

3

1

2

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1

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Most Liked Positive Review

5.0

Worked perfect .

It would be nice if it had longer bolts for the flywheel or spacers. Once I put it in and tried to bolt the flywheel to the torque converter what I thought would be a problem became evident, it wouldn't bolt up because my bolts weren't long enough. Lucky for me to have the foresight to get some longer flywheel bolts off of a newer chevy before I put it in. Other than that solved my problem got me back on the road.

Most Liked Negative Review

3.0

Definitely recommending product to friends

Great product worked just as advertised with a preside fit

Filter by Ratings

I would recommend this

5.0

a year ago

JJ

Wisconsin Oshkosh

Verified

Great price for this part

Would Recommend

Great product

5.0

a year ago

Ratpwr

NJ

Verified

This product fits perfectly in the back of the crankshaft and also on the hub of the converter

Would Recommend

THANK YOU

5.0

2 years ago

RONNIEO

E.R., WI

Verified

THOUGHT I WAS SCREWED. HAD R/B 1998 4L60E AND IT WOULD NOT FIT 1999 LS. THIS ADAPTER SAVED ME

Would Recommend

Good quality. Thank you!

5.0

4 years ago

Celeste

Oklahoma

Verified

Great product. Fits as it should.

Would Recommend

Perfect fit

5.0

4 years ago

Beto

Az

Verified

I would recommend this to anyone who is doing an LS swap on and mounting it to a older GM transmission

Would Recommend

I would buy this again

5.0

5 years ago

Scott Schmitt

Glenwood iowa

Verified

A family member referred me and great service totally my future purchases from this company.

Would Recommend

Awesome product!

5.0

5 years ago

Noah p

Illinois

Verified

Fast shipment, and product worked flawlessly

Would Recommend

Worked perfect .

5.0

5 years ago

Adam Town Hero

Bakersfield Ca

Verified

It would be nice if it had longer bolts for the flywheel or spacers. Once I put it in and tried to bolt the flywheel to the torque converter what I thought would be a problem became evident, it wouldn't bolt up because my bolts weren't long enough. Lucky for me to have the foresight to get some longer flywheel bolts off of a newer chevy before I put it in. Other than that solved my problem got me back on the road.

Would Recommend

Yes

4.0

5 years ago

cwandds

Oklahoma City, OK.

Verified

This is the adaptor you need, if your bolting a 700R4 transmission to a LS1, along with LS1 flexplate.

Would Recommend

yes

5.0

6 years ago

dave

France

Verified

perfect fit

Would Recommend

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Questions & Answers

14 Questions • 13 Answers

Will this adapter work for a powerglide as well?

by Alan

• 7 years ago

1 answer

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Hello. Wish to put an LS in my 75 Jimmy. 4x4. Any issues with a 4wd TH350?

by Greasy D

• 7 years ago

1 answer

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Will this spacer work for me to install the 96-99 5.7 4l60 trans to my 5.3 motor ? I have to run a the spacer and drill the holes in the 5.3 flex plate to install the 5.7 Converter

by Matthew

• 7 years ago

1 answer

View Answer

1999 GMC K1500 Suburban 4x4, original, stock 5.7L and 4l60e. Adding Danchuk 10100 adapter plate. But the flexplate spacer that came with Danchuk kit doesn't mate to the flexplate. Can't tell what spacer to buy - not enough detail in the descriptions - saw a video that said a "torque converter snout" might be all I need, but didn't mention a part number. Is this item the aforementioned "snout" and well it work in my application? If no, could you, would you point me to the correct part(s) to solve my dilemma? Many thanks, Ed

by Ed

• 7 years ago

1 answer

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Im looking at a blue print 427 lsx 8 bolt holes for the crank. I want to mate this engine to a turbo 400. With this adapter work? Also I need a sfi approved flexplate. Thanks

by Matt

• 8 years ago

2 answers

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I have a 2005 5.3 lm7. Will this spacer allow me to bolt up a 4l60e out of a 98 Tahoe

by Rioco

• 8 years ago

3 answers

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Installing a 2005 LS2 into a 1986 K5 Blazer, using a 4L80E 4WD Trans. Needing to know if there's an adapter offered so I can bolt up to the original Transfer Case! Thank you!

by Welch

• 8 years ago

1 answer

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Will this work for a gen4 6.0, to put a th350

by Jr

• 8 years ago

1 answer

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I have a 200r4 going behind a 6.0L lq9. Would this work for me? All these spacers seem the same, some are just $30 more than others for some reason.

by Matt

• 9 years ago

1 answer

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will this adapter work on my th350 and the original flex plate on the 5.3 with the longer bolts?

by houston

• 10 years ago

1 answer

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Fitment

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