At Rostra Transmission we work hard to provide our customers with a single source for all of their automatic transmission repair needs. If you haven't found an item that you're in need of, we want to know! Please fill out the form below with as much detail as possible describing the item you require, including Original Equipment part numbers (if available), and we'll do everything we can to add it to our extensive product line.

Vacuum Modulators by Rostra Transmission

Rostra has been manufacturing original equipment vacuum modulators since the early 1950s. What began as Skoville Manufacturing, then Century Brass, and now Rostra (purchased Allomatic production in 1982) is now one of the few companies in the world still producing a broad range of this sometimes forgotten technology.

We proudly offer over 30 part numbers for all of the popular Ford, GM and Jatco-produced vacuum controlled transmissions. We have consolidated as many original equipment part numbers as possible to keep your inventory levels low and to further simplify the ordering process. We have also made many applications adjustable to help you fine tune and put the finishing touches on your rebuild.

Click here to download our transmission modulator application guide.

Vacuum Modulators Product Listing

51-0017-00-00

GM 350/400 Adjustable Dual Red

51-0017-00-00 - GM 350/400 Adjustable Dual Red

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51-0020-00-00

GM 350/400 Adjustable Black and Red

51-0020-00-00 - GM 350/400 Adjustable Black and Red

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51-0025-05-00

Ford C4/C5 Adjustable Red

51-0025-05-00 - Ford C4/C5 Adjustable Red

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51-0032-04-00

Ford C4/C5 Adjustable Yellow

51-0032-04-00 - Ford C4/C5 Adjustable Yellow

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51-0033-04-00

Ford C6 Adjustable Black

51-0033-04-00 - Ford C6 Adjustable Black

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51-0049-01-00

Ford C6 Adjustable Purple

51-0049-01-00 - Ford C6 Adjustable Purple

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51-0054-00-00

Flash-O-Matic Adjustable Brown

51-0054-00-00 - Flash-O-Matic Adjustable Brown

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51-0055-01-00

Ford FMX Adjustable Light Green

51-0055-01-00 - Ford FMX Adjustable Light Green

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51-0056-02-00

Ford C4/C5 Adjustable Green

51-0056-02-00 - Ford C4/C5 Adjustable Green

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51-0062-02-00

GM 350/400 Adjustable Red

51-0062-02-00 - GM 350/400 Adjustable Red

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51-0069-00-00

GM 440 Adjustable Dual Red

51-0069-00-00 - GM 440 Adjustable Dual Red

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51-0070-00-00

GM 440 Adjustable Black and Red

51-0070-00-00 - GM 440 Adjustable Black and Red

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51-0071-01-00

Ford C6 Adjustable Green

51-0071-01-00 - Ford C6 Adjustable Green

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51-0075-00-00

Allison Adjustable White

51-0075-00-00 - Allison Adjustable White

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51-0301-04-00

Ford C3 Adjustable Green

51-0301-04-00 - Ford C3 Adjustable Green

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51-0301-22-00

Ford A4LD Adjustable

51-0301-22-00 - Ford A4LD Adjustable

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51-0301-22-00M

Ford A4LD Adjustable Ext.

51-0301-22-00M - Ford A4LD Adjustable Ext.

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51-0302-00-00

GM 180 Fixed Blue

51-0302-00-00 - GM 180 Fixed Blue

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51-0302-02-00

GM 180 Fixed Green

51-0302-02-00 - GM 180 Fixed Green

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51-0302-03-00

GM 180 Adjustable Dual Blue

51-0302-03-00 - GM 180 Adjustable Dual Blue

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51-0302-04-00

GM 180 Adjustable Dual Green

51-0302-04-00 - GM 180 Adjustable Dual Green

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51-0302-05-00

GM 180 Adjustable Purple

51-0302-05-00 - GM 180 Adjustable Purple

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51-0305-01-00

Ford C4/C5 Adjustable White

51-0305-01-00 - Ford C4/C5 Adjustable White

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51-0307-01-00

Jatco/Mazda Adjustable

51-0307-01-00 - Jatco/Mazda Adjustable

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51-0308-02-00

Powerglide Adjustable Red

51-0308-02-00 - Powerglide Adjustable Red

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51-0309-00-00

Jatco/Mazda Adjustable

51-0309-00-00 - Jatco/Mazda Adjustable

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51-0314-00-00

Jatco/Mazda Adjustable

51-0314-00-00 - Jatco/Mazda Adjustable

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51-1210-36-00

Ford C4 Adjustable Blue

51-1210-36-00 - Ford C4 Adjustable Blue

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51-1210-38-00

Ford C4 Adjustable White

51-1210-38-00 - Ford FMX Adjustable White

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We appreciate and welcome all new opportunities! Rostra Transmission is capable of designing and manufacturing many different types of solenoids. If you have a specialized need or a recommendation for a new product, please contact us using the form below to discuss your specific needs with one of our engineers.

Contact Rostra Transmission Technical Support

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Click to download our complete automatic transmission repair product guide