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Standard Ignition TM-58 Automatic Transmission Vacuum Modulator
| Brand | Standard Ignition TM-58 |
|---|---|
| Fits | Pontiac, Chevrolet, Buick, Cadillac, and Oldsmobile · 39 vehicles |
Performance-calibrated. Matches transmission shift points to engine load.
Nylon-reinforced diaphragm. Built for durable, tear-proof operation.
High-temperature oil seals. Help ensure a proper fit and leak-proof operation.
Cross-references 7R1005, 57-7034 and 3057720 for the same application. See all 10.
Automatic Transmission Vacuum Modulator for GM Applications
Standard Ignition TM-58 is an automatic transmission vacuum modulator built for GM vehicles that use vacuum signal to help control shift timing. It is performance-calibrated to match transmission shift points to engine load, with a reinforced diaphragm and high-temperature oil seals for dependable operation.
Fits 1984 Pontiac 6000, N/A; Fits 1984-1989 Chevrolet Celebrity, N/A; Fits 1984-1986 Buick Century, N/A; Fits 1984-1986 Oldsmobile Cutlass Ciera, N/A; Fits 1985-1986 Cadillac DeVille, N/A; Fits 1985 Cadillac Fleetwood, N/A; Fits 1985-1986 Oldsmobile 98, N/A; Fits 1986 Buick LeSabre, N/A; Fits 1986 Buick Riviera, N/A; Fits 1986 Cadillac Commercial Chassis, N/A, w/o Stripe; Fits 1986 Cadillac Eldorado, N/A; Fits 1986 Oldsmobile Delta 88, N/A; Fits 1986 Oldsmobile Toronado, N/A; Fits 1990 Pontiac Grand Prix, N/A.
- Vacuum modulator for automatic transmission shift control
- Calibrated to respond to engine load for more consistent shift behavior
- Nylon-reinforced diaphragm for durability and tear resistance
- High-temperature oil seals for a secure, leak-resistant fit
- 100% end-of-line tested before release
Detailed Product Overview
The Standard Ignition TM-58 vacuum modulator is used on automatic transmissions that rely on manifold vacuum to influence shift timing and feel. It is a direct-fit service part for a range of GM cars and chassis applications, including Chevrolet Celebrity, Buick Century, and Pontiac Grand Prix models listed above. The TM-58 is also cross-referenced to Standard Ignition TM77 for the same application.
Common Transmission Issues It May Address
- Delayed or early automatic transmission shifts
- Harsh or inconsistent shift feel under changing engine load
- Vacuum-related transmission fluid leakage at the modulator
- Diaphragm wear that affects modulator response
- Driveability concerns tied to incorrect shift calibration
Installation Notes and Tips
Verify the transmission application and the vehicle notes before installation, especially for Cadillac Commercial Chassis models listed without stripe. Inspect the vacuum line, modulator connection, and surrounding seals for wear or contamination before replacing the unit. Confirm proper vacuum routing after installation so the transmission can respond correctly to engine load.
Quality Assurance
Standard Ignition TM-58 undergoes 100% end-of-line testing to confirm performance before it leaves the factory. The reinforced diaphragm and high-temperature oil seals are used to support long-term sealing and consistent operation in transmission service.
| Year | Make | Model | Body Type | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 1990 | Pontiac | Grand Prix | — | 3.1L | V6 | — | N/A | — |
| 1989 | Chevrolet | Celebrity | — | — | — | — | N/A | — |
| 1988 | Chevrolet | Celebrity | — | — | — | — | N/A | — |
| 1987 | Chevrolet | Celebrity | — | — | — | — | N/A | — |
| 1986 | Buick | Century | — | 3.8L | V6 | — | N/A | — |
| 1986 | Buick | LeSabre | — | — | — | — | N/A | — |
| 1986 | Buick | Riviera | — | 3.8L | V6 | — | N/A | — |
| 1986 | Cadillac | Commercial Chassis | — | 4.1L | V8 | — | N/A | w/o Stripe |
| 1986 | Cadillac | DeVille | — | 4.1L | V8 | — | N/A | w/o Stripe |
| 1986 | Cadillac | Eldorado | — | 4.1L | V8 | — | N/A | — |
| 1986 | Chevrolet | Celebrity | — | — | — | — | N/A | — |
| 1986 | Oldsmobile | 98 | — | 3.8L | V6 | — | N/A | — |
| 1986 | Oldsmobile | Cutlass Ciera | — | 3.8L | V6 | — | N/A | — |
| 1986 | Oldsmobile | Cutlass Ciera | — | 2.8L | V6 | — | N/A | — |
| 1986 | Oldsmobile | Delta 88 | — | 3.8L | V6 | — | N/A | — |
| 1986 | Oldsmobile | Delta 88 | Sedan | 3.0L | V6 | — | N/A | — |
| 1986 | Oldsmobile | Toronado | — | 3.8L | V6 | — | N/A | — |
| 1985 | Buick | Century | — | 3.0L | V6 | — | N/A | — |
| 1985 | Buick | Century | — | 3.8L | V6 | — | N/A | — |
| 1985 | Cadillac | Commercial Chassis | — | 4.3L | V6 | DIESEL | N/A | — |
| 1985 | Cadillac | Commercial Chassis | — | 4.1L | V8 | — | N/A | — |
| 1985 | Cadillac | DeVille | — | 4.1L | V8 | — | N/A | w/o Stripe |
| 1985 | Cadillac | DeVille | — | 4.3L | V6 | — | N/A | w/o Stripe |
| 1985 | Cadillac | Fleetwood | — | 4.1L | V8 | — | N/A | — |
| 1985 | Cadillac | Fleetwood | — | 4.3L | V6 | — | N/A | — |
| 1985 | Chevrolet | Celebrity | — | — | — | — | N/A | — |
| 1985 | Oldsmobile | 98 | — | 3.0L | V6 | — | N/A | — |
| 1985 | Oldsmobile | 98 | — | 3.8L | V6 | — | N/A | — |
| 1985 | Oldsmobile | Cutlass Ciera | — | 3.8L | V6 | — | N/A | — |
| 1985 | Oldsmobile | Cutlass Ciera | — | 2.8L | V6 | — | N/A | — |
| 1985 | Oldsmobile | Cutlass Ciera | — | 3.0L | V6 | — | N/A | — |
| 1984 | Buick | Century | — | 2.8L | V6 | — | N/A | — |
| 1984 | Buick | Century | — | 4.3L | V6 | — | N/A | — |
| 1984 | Chevrolet | Celebrity | — | — | — | — | N/A | — |
| 1984 | Oldsmobile | Cutlass Ciera | — | 2.8L | V6 | — | N/A | — |
| 1984 | Oldsmobile | Cutlass Ciera | — | 3.0L | V6 | — | N/A | — |
| 1984 | Oldsmobile | Cutlass Ciera | — | 3.8L | V6 | — | N/A | — |
| 1984 | Oldsmobile | Cutlass Ciera | — | 4.3L | V6 | DIESEL | N/A | — |
| 1984 | Pontiac | 6000 | — | 4.3L | V6 | DIESEL | N/A | — |
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