Reid Racing Automatic Transmission Extension Housing

Reid Racing Tailshaft Housings: Precision-Built for Racing Performance

When a high-horsepower build demands every component perform flawlessly under load, the transmission extension housing — also known as the tailshaft housing — is one of the most overlooked yet critical links in the drivetrain chain. It anchors the output shaft, manages the seal against fluid loss, and must absorb the torsional stress that powerful engines generate lap after lap, pass after pass. Reid Racing has spent decades earning its reputation by engineering these components to a standard that stock and budget-tier parts simply cannot match.

Aircraft-Grade Aluminum, Redesigned from the Ground Up

What separates Reid Racing's automatic transmission extension housings from the factory units they replace is the approach to materials and geometry. All extension housings are precision-machined from aircraft-grade aluminum and feature redesigned oil passages for improved lubrication to the bearing or bushing. The result is a housing that runs cooler, seals better, and lasts longer than a worn or stock-spec piece — exactly what a competition drivetrain demands.

Reid Racing's tailshaft housings are engineered for improved rigidity and strength, with perfectly aligned bores that deliver maximum power output to the driveshaft. That bore alignment is not incidental — even minor misalignment in a high-RPM application causes premature bushing or bearing wear, vibration harmonics, and ultimately, failure at the worst possible moment.

Fitment for GM's Most Popular Racing Transmissions

Reid Racing's extension housing lineup targets the two GM automatic transmissions that dominate drag racing and performance builds: the Powerglide and the TH400 (Super Hydra 400). Available configurations include:

• Powerglide Tailshaft Housing (Part# RER-PGH1R / RER-PGH1B) — aluminum, natural finish, available with bushing or double lip seal kit
• TH400 Tailshaft Housing with Bushing (Part# RER-SH400HB) — a direct-fit aluminum upgrade for standard TH400 applications
• TH400 Tailshaft Housing with Roller Bearing (Part# RER-SH400HR) — upgraded roller bearing version for reduced friction and improved durability
• TH400 Powerglide-Length Tailshaft Housing with Roller Bearing (Part# RER-SH400HRS) — a short-length option that swaps a TH400's output housing to Powerglide dimensions, ideal for tunnel-clearance or chassis-specific builds

This range of configurations reflects Reid Racing's understanding that racers and builders have specific chassis requirements — no one-size-fits-all approach here.

A Brand Built on Racing Credibility

Reid Racing was founded in 2006 as a corporate spin-off from Dedenbear Products, the company that Dennis and Debra Reid had built since 1979. Drawing on decades of hands-on drag racing experience, the Reids developed transmission components capable of handling the extreme power and torque of modern performance engines. Their products — including these tailshaft housings — have grown to be widely used across drag racing, off-road racing, and circle track racing, trusted by builders who cannot afford drivetrain failures under competition conditions.

For any Powerglide or TH400 build where output shaft protection and lubrication integrity matter, Reid Racing's automatic transmission extension housings represent the kind of purpose-built, USA-engineered solution that the performance community has relied on for years.