LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter Flexplate

Description

This flexplate allows the use of GM TH350, 700R4, 200-4R, 4L60, and Powerglide transmissions with Gen III LS engines, Works with 10.75″ and 11.066″ (11.1″) torque converter bolt patterns, Works with factory LS starter to reduce conversion costs, Features double welded ring gears for added durability, .035″ thicker than stock which meets SFI 29.1 certification
LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter Flexplate
Sku # 57534610
Mfr. Part # 57534610
Condition
New
Brand
Speedway Motors
Sold
Each
Details
Notes
If you’re installing a TH350 or 700R4 behind an LS engine, we recommend the use of adapter sleeve 57518346 which centers the torque converter hub into the LS crankshaft. Also, we recommend new flexplate bolts such as 1012442901.
May not work with some 1999-2000 LQ4 6.0 LS engines, specifically ones that came with a 4L80E automatic as they require a flat flexplate due to the “tall” crank flange.
Info
Make your Gen III LS swap a breeze with this flexplate adapter for GM automatic transmission. These platinum series flexplates are engineered to handle extreme duty applications and designed to take the punishment of today’s high horsepower Gen III engines. The 4mm thick centerplate provides a solid foundation (that’s 0.035″ thicker than stock). Ring gears are precision welded to meet SFI 29.1 specifications, utilizing robotic cold-welding processes. These flex plates are inspected throughout the manufacturing cycle to ensure a high quality, safe end product.
SFI 29.1 certified
Direct bolt on for Gen III LS engines w/ “short” crank flange
Adapts to GM TH350/700R4/2004R/4L60/Powerglide transmissions
Works with 10.75″ & 11.066″ (11.1″) bolt-pattern torque converters
Constructed from cold-rolled premium steel
0.035″ thicker than stock flexplates
Long lasting gold iridited finish prevents rust
Forged 1-piece steel ring gear w/ 168 teeth
Features double welded ring gears for added durability
Works with factory LS starter motor
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, 700R-4, 200-4R, 4L60 and Powerglide
transmissions that originally came behind a non-LS engine
(such as a SBC or BBC V8).
WARNING: Cancer and Reproductive Harm — p65Warnings.ca.gov
Specs
Material Type
Steel
Sold in Quantity
Each
Tooth Count
168
SFI Rating
29.1
MFG. Part #
57534610
Bolt Hole Pattern
10.75″ and 11.066″
Reviews
Sure
Rated
by Fernie on March 25, 2021
Summary:
It fit good and looks more durable than the on i had before
Yes, I recommend this product.
Doing a LS2 swap in a 67 k10. Appears to be heavy duty.
Rated
by WV Hillbilly on March 22, 2021
Summary:
Flexplate appears to be heavy duty and durable.
Yes, I recommend this product.
Should bought this first! Exactly what i needed!
Rated
by Chris on May 28, 2020
Summary:
Used this to put a powerglide to LS.
Yes, I recommend this product.
Good quality product
Rated
by Timothy on May 05, 2020
Summary:
This arrived on-time and as expected. I always receive quality items from Speedway motors and would recommend ordering this part or any other from them.
Yes, I recommend this product.
Fitted perfectly. Ls1 to 700r4. No mucking around modifying
Rated
by Karl on March 05, 2020
Summary:
Highly recommend this product to anyone fitting 700r4 or th350 behind an Ls1.
Cons:
None
Pros:
Fits perfectly without the need for modification
Great product at a good price.
Yes, I recommend this product.
Related Items / Suggested Parts
TCI Automotive 399753 LS1 Engine to GM Auto Transmission Adapter
ARP 244-2901 Chevy Gen III/LS Flexplate Bolts
Chevrolet Performance 19257940 LS Gen III/IV Flexplate Bolts, Set/6
LS Crankshaft TH350/TH400/700R4 Torque Converter Adapter Sleeve
Gen III GM LS V8 to TH350/700R4 Transmission Adapter Kit
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 69 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
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