 In the movies, the business end of the control harness attaches to the computer harness port in the 4L60. In real life, that means putting your hand in a cramped, dusky, maybe even grimy slot. |
The ATCB is a multi-tasking device able to apply the torque converter clutch which facilitates calibration of ignition timing and A/F ratios over a broader range of engine speeds and throttle openings. It means that you can also determine torque output below the stall speed of the converter and quickly evaluate a variety of shift and converter lock-up points. Simply, the ATCB affords the ability to choose the gear as well as the moment the torque converter is applied for any GM electronic four-speed automatic, front-wheel drive included.
 |
 |
|
Besides the full-on, foam-lined kit, there are optional accessories for the 1X100100 ATCB. |
|
As a kit, the ATCB includes the control box (with torque converter control) and gear selector, a 6-foot power cord that plugs into the cigarette lighter, two 12-foot control harnesses: one for the 4T40E transaxle and 4L80/85E and the other for the 4T65E transaxle and 4L60/65/70E transmissions. A foam-padded carrying case holds it all. Adjunct to the electronically controlled transmissions, the ATCB can also be adapted to lock up the converter clutch of the TH125C, 200C, 2004R, 3T40, 350C, and 700R4/4L60 trannys.
| Click below for full-size graphs of the same transmission. The stock curve is at left, the ATCB curve at right. | |
 |
 |
