This kit will allow you to use your OEM 3-speed dual gate shifter with either a stock style 3-speed automatic or a new 4-speed overdrive transmission. We provide a lever for the transmission that provides the shifter the proper throw for whatever transmission your using. 4-speed kits move the gears closer together to allow the extra gear to fit into the gated space available. As a result, overdrive will be in the swing position where neutral was before (view diagram below). To help fine-tune your resulting gear positions, we include our adjustable shift cable to perfectly dial in your shifter.
*Note: The overdrive conversion puts overdrive in the neutral position. Low, second, and drive are located normally.
Our products allow our customers a viable solution to retain the factory appearance of their car without sacrificing performance. "In the olden days" many GM vehicles came with either a Powerglide or a 3-speed automatic such as a TH350 or TH400. As time went on, GM released a variety of transmissions that had overdrive capability. Overdrive simply means that the output shaft of the transmission rotates faster then the speed of the input shaft from the engine. The result was better fuel economy, as well as more gentle highway RPMs. Some of the popular transmissions in this category include the TH700-R4, TH200-4R, 4L60, and 4L80E.
The main issue arose, however, when hot-rodders and car enthusiasts began attempting to swap these transmissions into their classics the factory shifter no longer functioned properly. This is where Shiftworks comes in. From conversion kits for factory floor-shifters, to complete new shifter packages, we enable hot-rodders to upgrade their cars transmission, without moving away from a completely factory interior look. With new shifter detents, transmission components, and console indicators designed for 3-speeds, 4-speed overdrives, and even for some applications, 6 & 8-speed automatics, Shiftworks products allow you to make your transmission swap as if your car came that way.
| Download Name | File Size |
| C10_C20_Drop_Spindle_ID_diameters.pdf | 4.85MB |
| Make | Model | Years |
| Oldsmobile | Cutlass | 1970 - 1972 |
