HYDRA-MATIC PRODUCT DESIGNATION SYSTEM
A new designation system has been developed by Hydra-Matic to functionally describe their products. New transmission designations will indicate (in sequence) the number of speeds, type, series, and major features (if applicable) of each transaxle or transmission. New designations of transmissions will be used throughout this section.
| 3 - No. Speeds | T - Type | 40 - Series | E - Features |
|---|---|---|---|
| 3 | T - Transverse | Based on | E - Elect. Control |
| 4 | L - Longitudinal | Relative | A - AWD |
| 5 | M - Manual | Torque rating | HD - Heavy Duty |
HYDRA-MATIC PRODUCT DESIGNATION SYSTEM CODES
| Previous Designation | New Designation |
|---|---|
| THM A-1 | HYDRA-MATIC 3T40-A |
| THM F-7 | THM F-7 |
| THM R-1 | HYDRA-MATIC 4L30-E |
| THM 125/125C | HYDRA-MATIC 3T40 |
| THM 180/180C | HYDRA-MATIC 3L30 |
| THM 200-4R | (1) THM 200-4R |
| THM 400 | HYDRA-MATIC 3L80 |
| THM 440-T4 | HYDRA-MATIC 4T60 |
| THM 475 | HYDRA-MATIC 3L80-HD |
| THM 700-R4 | HYDRA-MATIC 4L60 |
| (1) No change in designation. | |
| (1) | No change in designation. |
HYDRA-MATIC PRODUCT DESIGNATIONS (AUTOMATIC)
| Manufacturer/Model | Body | Transmission(s) | |
|---|---|---|---|
| Buick | |||
| Electra Wagon | "B" | 200-4R & 4L60 | |
| LeSabre Wagon | "B" | 200-4R & 4L60 | |
| Cadillac | |||
| Brougham | "D" | 200-4R | |
| Chevrolet | |||
| Camaro | "F" | 4L60 | |
| Caprice | "B" | 200-4R & 4L60 | |
| Corvette | "Y" | 4L60 | |
| Oldsmobile | |||
| Custom Cruiser | "B" | 200-4R & 4L60 | |
| Cutlass Cruiser | "A" | 200-4R & 4L60 | |
| Pontiac | |||
| Firebird | "F" | 200-4R & 4L60 | |
| Safari Wagon | "B" | 200-4R & 4L60 | |
GENERAL MOTORS RWD AUTOMATIC TRANSMISSION APPLICATION
Removal (All Models)
- Disconnect negative battery cable and remove air cleaner. Disconnect upper end of T.V. cable at throttle or carburetor linkage, and remove filler tube. Raise and support vehicle on a hoist. Index mark and remove drive shaft.
- On Corvette models, remove complete exhaust system and driveline beam. On Corvette convertible, remove upper and lower body braces. Camaro and Firebird, remove torque arm from rear suspension. On Cadillac, remove header pipe at exhaust manifold, catalytic converter, fuel line-to-transmission bracket and transmission-to-engine ground strap bolt.
- Remove lower floor reinforcement (if equipped). Disconnect speedometer cable. Remove shifter linkage and disconnect all electrical connectors. Remove flexplate cover. Index mark flexplate to torque converter and remove attaching bolts.
- Remove catalytic converter support bracket and remove crossmember. Support transmission with transmission jack. Lower transmission slightly, disconnect oil cooler lines and remove T.V. cable hold down bolt.
- Support engine with a screw jack and block of wood. Remove transmission-to-engine bolts. Pull transmission back enough to install Torque Converter Holder (J-21366). Lower transmission from vehicle.
- To install transmission, reverse removal procedures. Observe index marks made during removal and align marks to original positions.
- Test torque converter for freedom of rotation. Tighten torque converter-to-flexplate bolts finger tight, then tighten to specifications. Adjust shift linkage and T.V. cable as necessary. Fill transmission to proper level with fluid. See TRANSMISSION SERVICING - A/T article in this section.
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) | |
|---|---|---|
| Cooler Lines | 16 (22) | |
| Crossmember-to-Frame Bolts | 41 (56) | |
| Flexplate-to-Crankshaft | ||
| 2.8L | 35 (47) | |
| 3.8L | 61 (83) | |
| 4.3L & 5.0L | 74 (100) | |
| All Others | 60 (81) | |
| Torque Converter-to-Flexplate | 46 (62) | |
| Transmission-to-Engine | 35 (47) | |
| Transmission-to-Mount | 35 (47) | |
TORQUE SPECIFICATIONS (THM 200-4R & 4L60)