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Old 06/09/08, 09:15 AM   #1
KDML
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C4 Vacuum Modulator Which Color Stripe

I noticed some fluid leaking out between the case and vacuum modulator on the back of my C4. When I pulled one of the hoses off (the one closest to the trans) fluid came out of the hose, so I assume I need to replace the modulator. The other hose (rear) was dry.

I looked online for a new modulator and there are different choices which are denoted by a colored stripe (red, green, blue). This is a stock 1974 C4 - which color stripe should I ask for? In addition, is there any sort of gasket between the modulator and the trans case or does the O-ring keep fluid from leaking out?

Thanks
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Old 06/09/08, 09:47 AM   #2
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The red stripe is the one with the dual vac hoses. The other colors are single vacuum source. The O-ring is the only seal for the modulator, there are no gaskets. Here's a good source for parts. Looks like you need the spendy one. http://www.bulkpart.com/Merchant2/me...e=C-4modulator

EFI, OBDII, 5.0
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Old 06/09/08, 10:06 AM   #3
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Stop in at your local trans shop or NAPA. This trans is so common that they should have it for you on the shelf.
(always nice to know a local shop expert, seems like I always have a question i.e. kick down, shift points, band adjustments, converters, etc....)
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Old 06/09/08, 10:07 AM   #4
tasker
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I always go with the meenie greenie, they are adjustable as well..

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Old 06/09/08, 10:25 AM   #5
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Green C4/C5.. per the C4 Gods..

http://classicbroncos.com/forums/sho...ght=C4+rebuild

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Old 06/09/08, 11:03 AM   #6
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what came out other than fluid?

should also be a small rod and a valve(valve probably didnt fall out but rod should be placed in the modulator then reinstalled

'69, 306 EFI'ed, ZF, DANA 44, 4 WHEEL DISC'S, ASTROBOOST, 3.5"SUSPENSION LIFT, 2"BODY LIFT, GLASS BODY, 37" ON MRW, 5.13's GRZZ/GRIZZ , MOSER, STONE CRUSHER, POWER STEERING, BAILIE BILT, DURABACK, RJM
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Old 06/09/08, 01:47 PM   #7
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Looks like it is red stripe by default as it is the only one with two ports for the hoses.

Nyles, you are correct, only the rod came out the not the valve (which I hope is still in there).

Thanks everyone
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