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Sonnax Extreme Duty Main Shafts

Main shaft failure is a common problem in extreme duty GM TH400, 4L80-E and 4L85-E units. OE and aftermarket shafts simply don't hold up in extreme horsepower applications, leading to spline twist and shaft breakage. Sonnax replacement extreme duty main shafts are manufactured from an exceptionally tough high-strength Aermet steel alloy with proprietary heat treatment for unrivaled performance and durability. An advanced torsional design with spline and cross-hole refinements make these the most durable 1 in. main shafts available. These shafts withstood extensive track and lab testing with unbroken results in the most extreme applications. Additional details: * Recommended for applications above 1,000 hp * Top-notch engineering and precision manufacturing deliver unrivaled performance and durability in the 1 in. stock size * Rear spline prevents the rear internal gear journal-end from twisting off by engaging the full internal spline of the gear * Extensive in-vehicle and lab testing with unbroken performance

Not Yet Reviewed

$978.48

Sonnax Extreme-Duty Clutch Hub and Intermediate Shaft Assemblies

The ideal upgrade for performance vehicles with the GM 6L80 or 6L90 transmission, Sonnax extreme-duty 4-5-6 clutch hub and intermediate shaft guarantees maximum protection against shaft breakage. The unique hub design improves oil flow and accepts Powerglide-style frictions to optimize clutch durability. In place of the 2-piece shaft/hub, Sonnax uses a much stronger, one-piece design that eliminates the OE assembly's weak, welded connection. It is custom forged from ultra-high-strength 300M billet steel, and then heat-treated and shot-peened for added durability. This combination of features guards against broken 4-5-6 hubs and the risk of rear splines shearing off.

Not Yet Reviewed

$1,015.08

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$1,157.55

Sonnax Heavy-Duty Main Shafts

Main shaft failure is a common problem in performance and heavy-duty GM TH400, 4L80-E and 4L85-E units. Sonnax replacement heavy-duty main shafts are manufactured from high-strength 300M with proprietary heat treatment and post heat-treat processing for exceptional performance, durability and value. These shafts are recommended for applications up to 1,000 hp. Additional details: * Advanced torsional design with spline and cross hole refinements for additional strength * Direct replacement for OE shafts

Not Yet Reviewed

$425.28

ATI 300M Intermediate Shafts

ATI 300M intermediate shafts are part of the company's extensive line of automatic transmission input shafts. Grade 300M is a high-strength, low alloy steel. Torsional input shafts work like a torsional spring bar, twisting and returning to totally eliminate breakage while reducing shock loads to the geartrain. The intermediate shafts are designed to fit either the Powerglide or TH400 splines. Order the replacement recommended for your application.

Not Yet Reviewed

$258.00

FTI Performance Intermediate Shafts

High-horsepower and hard launches at the dragstrip can cause havoc on transmission internals. Be confident that an FTI Performance automatic transmission intermediate shaft will not twist or break under stress—and will handle the power you put to it. These shafts are available in different materials for specific applications.

4.5 out of 5 stars ( 2 )

$289.00

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$569.00

ATI Heavy-Duty Vasco Intermediate Shafts

ATI heavy-duty Vasco intermediate shafts are manufactured from Vasco Max C300 steel and available for a variety of transmissions. This material is exceptionally strong and resilient, allowing these intermediate/main shafts to withstand the most severe torsional shock. Some shafts feature a solid design (for center lube transmissions only) with no lube holes to help eliminate premature fractures. Order the ATI heavy-duty Vasco intermediate shafts best suited for your application.

4.0 out of 5 stars ( 3 )

$309.85

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$339.85

Summit Racing™ Intermediate Shafts

Summit Racing™ intermediate shafts are machined from Vasco 300M steel. This material is exceptionally strong and resilient, allowing these intermediate/main shafts to withstand the most severe torsional shock. You can be confident they will not twist or break under stress--and will handle the power you put to your automatic transmission.

5.0 out of 5 stars ( 4 )

$318.99