1971 302 modulator valve

A friend of mine that has a transmission shop is rebuilding my C4 tranny and we are getting different info on the correct modulator valve. 

Could someone tell me what is the correct modulator valve for 1971 mustang with C4 behind a 302.

Two types were used for a C4 - threaded and push in.

You can order from them direct, or use the part numbers they show to cross at a good parts store such as NAPA

https://globaltransmissionparts.com/ford-lincoln-mercury-transmission-parts/c4-c5/modulators/

Two types were used for a C4 - threaded and push in.

You can order from them direct, or use the part numbers they show to cross at a good parts store such as NAPA

https://globaltransmissionparts.com/ford-lincoln-mercury-transmission-parts/c4-c5/modulators/

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i didn't know there were "push in" vacuum modulators, mine are threaded.   The different ones i know of are color coded and certain colors match up to different transmissions.

Get one that is adjustable.  It will allow you to tune in your shift points and give you better performance.  You can buy almost anywhere.  Here is a link to Summit Racing and the one that they carry for a C4. https://www.summitracing.com/parts/atp-fx102

The color codes are simply to indicate the setting of the modulator adjustment. In an aftermarket application, you'd probably adjust it to suit your taste anyway, so stripe color is somewhat irrelevant.

Everything I have shows the white and green stripe units are interchangeable, but here's the NAPA listing for a green stripe unit.

https://www.napaonline.com/en/p/ATP15060?searchCategory=c8.s5&searchIndex=Universal

Get one that is adjustable.  It will allow you to tune in your shift points and give you better performance.  You can buy almost anywhere.  Here is a link to Summit Racing and the one that they carry for a C4. https://www.summitracing.com/parts/atp-fx102

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All single vacuum modulators are adjustable.

This is why I love the - 7173 mustangs.com. It can be a wealth of information.

Thanks for the great responses.

.

Get one that is adjustable.  It will allow you to tune in your shift points and give you better performance.  You can buy almost anywhere.  Here is a link to Summit Racing and the one that they carry for a C4. https://www.summitracing.com/parts/atp-fx102

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Howdy,

I recently rebuilt my fmx tranny and will need a new modulator as well. I didnt know they made a adjustable one. Is that c4 unit also good for the fmx? 

Thank you

Get one that is adjustable.  It will allow you to tune in your shift points and give you better performance.  You can buy almost anywhere.  Here is a link to Summit Racing and the one that they carry for a C4. https://www.summitracing.com/parts/atp-fx102

Click to expand...

Howdy,

I recently rebuilt my fmx tranny and will need a new modulator as well. I didnt know they made a adjustable one. Is that c4 unit also good for the fmx? 

Thank you

Click to expand...

I would use one listed for that tranny.  You could get the following  https://www.summitracing.com/parts/frm-fm2306/applications or check your local parts store for one.   Also as Hemikiller stated all single aftermarket ones are adjustable.

Get one that is adjustable.  It will allow you to tune in your shift points and give you better performance.  You can buy almost anywhere.  Here is a link to Summit Racing and the one that they carry for a C4. https://www.summitracing.com/parts/atp-fx102

Click to expand...

Howdy,

I recently rebuilt my fmx tranny and will need a new modulator as well. I didnt know they made a adjustable one. Is that c4 unit also good for the fmx? 

Thank you

Click to expand...

FMX unit is different. Rock Auto lists a bunch of options, all of which should be adjustable, or grab the one that Kilgon linked to at Summit.

https://www.rockauto.com/en/catalog/ford,1971,mustang,5.8l+351cid+v8,1132692,transmission-automatic,governor+/+modulator,8500