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Gen III GM LS V8 to TH350/700R4 Transmission Adapter Kit For Sale - New and Used


Gen III GM LS V8 to TH350/700R4 Transmission Adapter Kit

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Gen III GM LS V8 to TH350/700R4 Transmission Adapter Kit:
$143.99

This kit includes the parts required to bolt a GM TH350, 700R4, 200-4R, or Powerglide transmission behind a Gen III LS engine, Includes flexplate, torque converter adapter sleeve, flexplate bolts, and torque converter bolts, Works with 10.75" and 11.066" (11.1") torque converter bolt patterns, Works with factory LS starter to reduce conversion costs, Flexplate is .035" thicker than stock which meets SFI 29.1 certification Gen III GM LS V8 to TH350/700R4 Transmission Adapter Kit Sku # 91604000 Mfr. Part # 91604000 Condition New Brand Speedway Motors Sold Kit Details Info

Make your Gen III LS swap a breeze with this complete adapter kit for early GM automatic transmissions. These flexplate adapters 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.

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).

Kit Includes:

  • (1) Trans Adapter Flexplate
    • GM LS Gen II to early GM 3/4 speed automatic
    • Works with 10.75" & 11.066" (11.1") bolt-pattern torque converters
    • SFI 29.1 certified
    • Forged 1-piece steel ring gears
    • 168 tooth
    • Works with stock LS starter motor
  • (6) Gen III LS Flexplate Bolts
    • Fits Chevrolet Gen III/LS Series V8
    • Exclusive, flat, 12-point head design
    • Has a 200,000 psi rating
    • M11 x 1.5
  • (1) LS Crank Sleeve Adapter
    • Overall Height: 1.04"
    • Inside Diameter: 1.47"
    • Diameter Small End: 1.70"
    • Diameter Big End: 2.00"
    • Material Type: Steel
  • (1) Torque Converter Bolt Kit
    • Under Head Length: 1.25"
    • Thread Pitch: 7/16"-20
    • Wrench Type: 12 Point
Installation Tips
  1. 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.
Specs Sold in Quantity Kit SFI Rating 29.1 Reviews Perfect fit. Rated by Chris on February 01, 2022

Summary: Perfect fit for my LS1 to 700R4.

Yes, I recommend this product.

Speedway has awesome products and super fast shipping Rated by Andrew on December 25, 2021

Summary: Swapped from a 4l60e to a th350 and this helped bolt it all up

Yes, I recommend this product.

I definitely would buy this again if I do another LS swap Rated by Redhead on December 09, 2021

Summary: I put this on a 2014 Vortec 6.0 truck engine. Everything lined up perfectly.

Yes, I recommend this product.

Excellent Kit Rated by Rustychevyman on December 06, 2021

Summary: Nice package of all the parts you need

Yes, I recommend this product.

I would most definitely buy this product again if i were to Rated by Caiden on May 14, 2021

Summary: Used it to LS swap my 2nd gen camaro

Yes, I recommend this product.

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Tech Support We're here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. 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 70 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. Return Policy We want you to be satisfied with your purchase. If within 60 days after you receive your shipment and you are not satisfied, you may return the item for a refund. Refunds will be processed (1-2) days after the item is received by Speedway. All returned merchandise must be in original factory condition with no modifications or alterations. A restocking fee up to 15% may be applied if items are not in new condition.

Returned merchandise must include all packaging materials, warranty cards, manuals, and accessories. If the items being returned need to be repackaged, there will be a repacking charge. Repack the item in a sturdy box, include a copy of your invoice and complete the form on the back of the invoice. You must ship orders back PREPAID. WE DO NOT ACCEPT COD SHIPMENTS.

All fiberglass items returned will be subject to a 15% restocking charge. No returns on electrical parts, DVDs, and books unless they are defective. Absolutely no returns on special order or closeout merchandise. Payment
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Guarantee Speedway accepts full responsibility for the accuracy of our listings and product representation. If an egregious shipping or description error occurs, we are happy to assist with a replacement or refund. Disclaimer Due to our large inventory and the diversity of our product line, the stock photo used may not be an exact representation of the item you are offerding on. Please read all product information carefully before purchase to avoid any order issues.
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