Order Summary. Submit Review. Year , , , , , , , , Notes Chevelle , Coupe, Two Door. Notes Chevelle , Sedan, Four Door. Notes Chevelle , Sedan, Two Door. Notes Chevelle , Wagon, Four Door.
Notes Chevelle , Wagon, Two Door. Year , , , , , View More. Availability: In Stock - Limited Quantity. Add to Cart. Add to Project List. Upper Pushrod 2. Rod Clips 3. Block Side Stud 4. Bellcrank Felts 5. Return Spring 6. Clutch Fork 7. Upper Pushrod Boot 9. Frame Side Bracket All of this adds up to a much improved driving experience. Stepping up to a 5- or 6-speed manual provides more gearing options for a road course and even lets you build your car with ratios more tailored for the exact type of driving and racing you like to do.
The only real downsides to installing an overdrive transmission are cost, size, and, in some cases, complexity. Each of these factors varies greatly between automatic and manual overdrive transmissions. Naturally, you never know exactly what the condition of a salvage-yard component is, so a rebuild may be part of the price equation.
The THR4 was initially shunned by the performance world because it seemed to be weaker than a TH, and it was one of the first metric GM transmissions. Other upsides are that it is usually the least expensive of the automatic overdrive transmissions, and it is relatively easy to retrofit into a Chevelle. It has a. Generally, people use a slightly larger numerical rear gear ratio with this setup.
They can be built to withstand high levels of power. All of the automatic transmissions accept a traditional GM transmission mount. You can scrounge salvage yards looking for useable transmissions. You can also purchase them brand new, usually with desirable upgrades to work great in your older muscle car. This is a new 4L60E from TCI, and the company offers it in several versions to meet various performance needs. It accepts a traditional rubber or polyurethane transmission mount.
The last thing you need to do is install a throttle valve TV cable. The installation details of these transmissions are the same. The 4L80E was thought to be the modern, overdrive version of the TH when it first hit the streets.
From a strength and performance perspective, the 4L80E is definitely a player. Its downsides are size and weight. It is a computer-controlled transmission, so you also need to run a transmission controller. These systems plug into the transmission and offer an easy-to-use handheld interface, asking you basic questions and doing the rest of the work for you. The 4L80E is a completely computer-controlled transmission, which means you need a stand-alone controller.
TCI has taken the 4L80E to the next level, converting it to a six-speed automatic. The TCI 6X available in a complete kit that includes a shifter, controller, cooler, and even transmission fluid. A steering-wheel-mounted paddle shifter is an optional upgrade. Anyone who has worked with a 4L80E will tell you it is a massive transmission. Fully dressed with torque converter and fluid, it weighs approximately pounds, while a TH weighs about pounds.
There is also a variant of this transmission called the 4L85E with some stronger internal components. The exterior and the installation is the same. One of the coolest automatic overdrive transmissions currently available is the TCI 6X 6-speed.
This transmission is based on the 4L80E but gives you six forward gears. TCI rates this transmission up to hp, making it a very stout choice. Tremec, the company that supplies General Motors, Ford, and Chrysler with transmissions for their modern muscle cars, also offers versions for Chevelles. The oldest design in the Tremec lineup is the T-5 5-speed. It is the smallest of the Tremec transmissions, and it can be swapped into a Chevelle without major floor surgery but you need to cut a hole in the floor for the shifter, even if you have an original 4-speed car.
It is available with only one set of gear ratios, featuring a 2. Another significant advantage is that it can bolt up to a Muncie-style bellhousing, allowing you to retain your existing bellhousing and mechanical clutch setup. It is also the most economical of the Tremec aftermarket transmissions. The next box in the Tremec lineup is the TKO 5-speed, which is a completely different transmission than the T The TKO is a significant step up in strength and options, as far as the gear ratios go. Companies such as American Powertrain offer installation kits for these transmissions that include a curved sheet-metal section that can be welded in to raise and widen the transmission tunnel.
The TKO uses a late-model bolt pattern at the bellhousing, so a new bellhousing or scattershield is required. The big daddy of the Tremecs is the T56 Magnum 6-speed. There are several combinations of gear ratios available, including a 2.
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