Jeep T90 Transmission For Sale: Your Ultimate Guide to Finding and Understanding This Classic Workhorse

Jeep T90 Transmission For Sale: Your Ultimate Guide to Finding and Understanding This Classic Workhorse jeeps.truckstrend.com

The iconic image of a vintage Jeep, rugged and ready for anything, often brings to mind the simplicity and durability of a bygone era. At the heart of many of these legendary machines, from the battlefields of WWII to the farms and trails of post-war America, lay a transmission that embodied these very qualities: the Borg-Warner T90. For enthusiasts, restorers, and those seeking to breathe new life into their classic Willys or early CJ, finding a "Jeep T90 Transmission For Sale" is a crucial step in preserving automotive history.

This comprehensive guide delves into everything you need to know about the T90 transmission, from its storied past and enduring appeal to the practicalities of finding, inspecting, and installing one today. Whether you’re a seasoned mechanic or a budding restorer, understanding this venerable gearbox is key to a successful vintage Jeep project.

Jeep T90 Transmission For Sale: Your Ultimate Guide to Finding and Understanding This Classic Workhorse

Understanding the Legendary T90 Transmission

The Borg-Warner T90 is a three-speed, top-loading manual transmission renowned for its robust construction and straightforward design. Developed by Borg-Warner, it became the standard manual transmission for a significant lineage of Jeeps, including:

• Willys MB (WWII "Jeep"): The original war hero.
• Willys CJ-2A, CJ-3A, CJ-3B: The civilian iterations that brought the Jeep legend to the masses.
• Early Jeep CJ-5 and CJ-6: Up until the early 1970s, before the introduction of the T14 and later transmissions.

Key Features of the T90:

• 3-Speed Manual: Featuring a non-synchronized first gear (requiring double-clutching or a complete stop to engage smoothly) and synchronized second and third gears.
• Top-Loading Design: The internal components are accessed by removing a cover on top of the transmission case, simplifying rebuilds.
• Cast Iron Case: Contributes to its incredible durability and weight.
• Simplicity: Fewer moving parts compared to modern transmissions, making it easier to diagnose and repair.



• Common Variants: While often referred to simply as "T90," the most common variant for Jeeps is the T90A, designed to mate with the L-134 "Go-Devil" and F-134 "Hurricane" four-cylinder engines and the Dana 18 transfer case.

Its legacy is built on its ability to withstand harsh conditions and deliver reliable power, making it a perfect match for the utilitarian nature of early Jeeps.

Why Buy a T90 Transmission Today?

Despite its age, the T90 remains a highly sought-after component for several compelling reasons:

1. Authentic Restoration: For purists, an original T90 is essential for a historically accurate restoration of a vintage Willys or early CJ. It preserves the vehicle’s original character and driving feel.
2. Reliability and Durability: The T90 was over-engineered for its time, making it incredibly tough. A well-maintained or properly rebuilt T90 can outlast many modern transmissions.
3. Simplicity of Maintenance: Its simple design means that many common issues can be diagnosed and repaired by a competent DIY mechanic, reducing reliance on specialized shops.
4. Cost-Effectiveness (Compared to Swaps): While buying and rebuilding a T90 isn’t free, it’s often more cost-effective than performing a complete engine and transmission swap, which can involve custom fabrication, drive shaft modifications, and complex wiring.
5. Parts Availability: Thanks to a dedicated aftermarket and a strong community of vintage Jeep enthusiasts, virtually every internal component, gasket, and seal for the T90 is still readily available.

For those committed to keeping their vintage Jeep true to its roots, the T90 is not just a transmission; it’s a statement of authenticity and a connection to the vehicle’s storied past.

Where to Find a Jeep T90 Transmission For Sale

Finding a T90 can range from a quick online search to a dedicated treasure hunt. Here are the most common avenues:

1. Online Marketplaces:

   • eBay: A vast marketplace where you can often find everything from "core" transmissions (needing a full rebuild) to professionally rebuilt units. Be diligent with seller ratings and descriptions.
   • Craigslist/Facebook Marketplace: Local listings can yield good deals, especially if you’re willing to travel for pickup. Search for "Willys Jeep parts," "CJ-2A transmission," or "T90 transmission."
   • Dedicated Forums & Groups: Vintage Jeep forums (e.g., The CJ-2A Page, G503 for military Jeeps) and Facebook groups for Willys/CJ enthusiasts often have "for sale" sections where members trade parts. This is often where you’ll find the most knowledgeable sellers.

2. Specialty Vintage Jeep Parts Vendors: Several reputable businesses specialize in parts for classic Jeeps. They often sell new, used, and rebuilt T90s or can point you to resources.

   • Kaiser Willys Auto Supply: A prime source for new and rebuilt components.
   • Walck’s 4WD: Another excellent resource for vintage Willys parts.
   • Novak Conversions: While known for engine/transmission adapters, they sometimes have rebuilt units or cores.

3. Salvage Yards & Auto Recyclers: Less common for specific transmissions, but you might find a complete vintage Jeep in a specialized salvage yard that still has its original drivetrain. This is more of a "strike it lucky" scenario.

4. Swap Meets & Classic Car Shows: Events dedicated to vintage vehicles, especially Jeep-specific shows or military vehicle shows, are excellent places to network and find parts from fellow enthusiasts.

Types and Conditions: What to Expect

When searching for a T90, you’ll encounter various conditions and pricing tiers:

• "Core" or "As-Is" Used: These are typically transmissions pulled from vehicles, sold untested. They are the cheapest option but will almost certainly require a full rebuild. Expect issues like leaks, worn bearings, and possibly chipped gears.
• "Good Used" or "Running Take-Out": These units are advertised as functional when removed but still carry risks. They may have unknown mileage or wear and could still benefit from a thorough inspection and minor seal/gasket replacement.
• Professionally Rebuilt: These are units that have been disassembled, inspected, had all worn components replaced (bearings, synchros, seals, gaskets, sometimes gears), and reassembled by a specialist. They are the most expensive but offer the greatest peace of mind, often coming with a warranty.
• New Old Stock (NOS): Extremely rare finds – original, unused T90s that have been stored for decades. These are collector’s items and command premium prices.

The most common variant you’ll find for sale is the Borg-Warner T90A, which was standard for the L-134 and F-134 engines. Other T90 variants (like the T90J or T90K) were used in different vehicles (e.g., Ford trucks) and typically have different input shaft lengths, bell housing patterns, or output shafts, making them unsuitable for direct Jeep application without extensive modification. Always confirm it’s a T90A intended for Willys/Jeep.

What to Look For When Buying a T90

Even if buying a "core" for rebuild, a pre-purchase inspection is crucial:

• External Case Condition: Check for cracks, especially around mounting points (ears) where it bolts to the bell housing and transfer case. Hairline cracks can expand.
• Drain Plug Area: Ensure the drain plug threads are not stripped or damaged.
• Input and Output Shafts: Inspect the splines for excessive wear or damage. The input shaft pilot bushing area should be smooth.
• Shifter Tower: Check for excessive play in the shift levers. Ensure the tower itself isn’t cracked or bent.
• Fluid Condition (if present): If there’s oil inside, note its color and smell. Burnt or metallic-smelling oil indicates severe internal wear. Look for excessive metal flakes.
• Spin Test (if possible): If the shafts can be turned by hand, listen for grinding or excessive bearing noise.
• Ask Questions:
  • Where did it come from? (e.g., "was it a running vehicle?")
  • Has it ever been opened or rebuilt?
  • Are there any known issues?
  • What is the return policy?

For rebuilt units, inquire about the rebuild process, what parts were replaced, and the warranty offered.

Rebuilding vs. Buying Rebuilt: Making the Choice

This is a common dilemma for T90 buyers:

• DIY Rebuild:
  • Pros: Significant cost savings on labor, deep understanding of your transmission, satisfaction of doing it yourself.
  • Cons: Requires specialized tools (press, pullers), a clean workspace, mechanical aptitude, and patience. Can be time-consuming. Risk of errors if inexperienced.
  • Cost: Parts kits range from $200-$500, plus any specific gear replacements.
• Buying Professionally Rebuilt:
  • Pros: Ready to install, often comes with a warranty, done by experienced professionals. Saves time and hassle.
  • Cons: Higher upfront cost. Less hands-on learning.
  • Cost: Can range from $800-$2000+, depending on the vendor and what’s included.

For most enthusiasts, a DIY rebuild is a rewarding experience, as the T90 is relatively straightforward. However, if time is short or mechanical skills are limited, a professional rebuild is a wise investment.

Installation Considerations

While robust, the T90 requires careful attention during installation:

• Bell Housing Compatibility: The T90A is designed to mate with the bell housing of the L-134 Go-Devil and F-134 Hurricane engines. Ensure you have the correct bell housing.
• Transfer Case Integration: The T90 typically bolts directly to a Dana 18 transfer case. Confirm the correct adapter and bolt pattern.
• Clutch Components: You’ll need a clutch disc, pressure plate, throw-out bearing, and pilot bushing specifically designed for your engine/T90 combination.
• Mounting and Linkages: Ensure your transmission mount and shift linkages are in good condition or replaced.
• Fluid: Use the correct gear oil (often GL-1 or GL-3, not GL-4 or GL-5 which can damage yellow metals in older transmissions) as specified in your Jeep’s manual or by T90 experts.

Common Issues and Solutions

Even a T90 can have problems, most of which are addressable during a rebuild:

• Leaks: The most common issue. Usually due to worn seals (input, output), gaskets (case halves, shifter tower), or loose bolts. Easily fixed with a rebuild kit.
• Grinding Going into 2nd or 3rd: Worn synchronizer rings. Requires disassembly and replacement of the synchros.
• Jumping Out of Gear: Worn gears (especially 1st and reverse), worn detent balls/springs, bent shift forks, or excessive end play in shafts. Requires internal inspection and replacement of worn parts.
• Excessive Noise (Whining, Humming): Worn bearings. A full bearing replacement is part of a standard rebuild.
• Hard Shifting: Can be worn synchros, low fluid, wrong fluid, or clutch issues (drag).

Tips for a Successful Purchase

1. Do Your Homework: Research T90 specifics for your exact Jeep model.
2. Buy from Reputable Sources: Prioritize sellers with good reviews or recommendations from the vintage Jeep community.
3. Ask for Photos/Videos: Don’t rely solely on descriptions. Ask for detailed pictures from multiple angles.
4. Factor in Shipping: T90s are heavy. Shipping costs can be substantial, especially for long distances.
5. Assume a Rebuild: Unless you’re buying a professionally rebuilt unit with a warranty, always budget and prepare for a full rebuild, even if the seller claims it’s "good."

Jeep T90 Transmission For Sale: Estimated Price Guide

Prices for a T90 transmission can vary significantly based on condition, seller, and location. This table provides a general range:

| Condition Category | Description | Estimated Price Range (USD) | Notes T90 Transmission For Sale: A Comprehensive Guide

The iconic status of early Jeeps is deeply intertwined with their core components, and among these, the T90 manual transmission stands as a stalwart. Renowned for its robust simplicity and unwavering reliability, the Borg-Warner T90 was the heart of countless Willys MBs, CJ-2As, CJ-3As, CJ-3Bs, and early CJ-5s and CJ-6s. For enthusiasts and restorers dedicated to maintaining the authenticity and functionality of these vintage off-road legends, finding a "Jeep T90 Transmission For Sale" isn’t just about sourcing a part; it’s about preserving a piece of automotive history and ensuring the continued life of a beloved classic.

This article serves as your ultimate guide to the Jeep T90 transmission, offering insights into its significance, where to find one, what to look for, and the considerations involved in its purchase and installation.

The Enduring Legacy of the T90 Transmission

Introduced by Borg-Warner, the T90 is a 3-speed, top-loading manual transmission that became synonymous with the early