A/T - New Hydramatic Model Information
89chevy01GMC NUMBER: 89-T-11
GROUP: 7A - Automatic Transmission
DATE: January, 1989
CORPORATE
NUMBER: 877148R
SUBJECT: 1989 NEW PRODUCT INFORMATION
MODELS: 1989 C, K, P, G, R, V TRUCKS EQUIPPED WITH THM 400/475 HYDRAMATIC 3L80/3L80 HD AUTOMATIC TRANSMISSIONS
FIGURE 1 - THM 400 SHIFT SPEED CHART:
FIGURE 2:
This information is an update to your 1989 Service Manual Transmission Diagnosis Section. A new model, DNA, was released after publication date.