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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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  #1  
Old November 19th, 2022, 01:28 AM
Gmguy Gmguy is offline
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Default GMC 7000 V12 clutch failed

Hi - I have a 1964 GMC 7000 V12 fire engine and the clutch master or slave cylinder failed - haven’t sorted out which yet. The service manual doesn’t provide any help with identifying a part number.

Does anyone know part numbers for replacements and where to find them? Thanks!
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Old November 22nd, 2022, 07:43 AM
BobBray BobBray is offline
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Default Re: GMC 7000 V12 clutch failed

You may not be able to find new clutch slaves and masters anymore, but if the bores are not bad a brake shop may be able to rebuild them. If the bores are bad, these people may be able to help:

https://whitepost.com/#hometop
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Old November 22nd, 2022, 02:20 PM
Gmguy Gmguy is offline
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Default Re: GMC 7000 V12 clutch failed

Thanks Bob - never thought about a brake shop. I’ll check that out.
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Old November 24th, 2022, 05:17 PM
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LEWISMATKIN LEWISMATKIN is offline
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Default Re: GMC 7000 V12 clutch failed

is this an L7000 steel tilt cab? if it is, it takes the same master cyl. as the DFI series (cracker box cab.) clutch slave cylinders are the same through out the truck line. if the master cylinder is the problem, more than likely, you will have to send it to White Post Restorations, as bob bray suggested. they do superior work. once the repair is completed, i recommend DOT 5 brake fluid (silicone) for the simple fact that DOT5 doesn't absorb water from the air where DOT3 & DOT4 do.
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Old November 25th, 2022, 01:36 PM
Gmguy Gmguy is offline
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Default Re: GMC 7000 V12 clutch failed

Yes, it is a tilt cab. Thanks very much for the info!
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Old November 25th, 2022, 09:32 PM
James James is offline
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Default Re: GMC 7000 V12 clutch failed

Quote:
Originally Posted by LEWISMATKIN View Post
is this an L7000 steel tilt cab? if it is, it takes the same master cyl. as the DFI series (cracker box cab.) clutch slave cylinders are the same through out the truck line. if the master cylinder is the problem, more than likely, you will have to send it to White Post Restorations, as bob bray suggested. they do superior work. once the repair is completed, i recommend DOT 5 brake fluid (silicone) for the simple fact that DOT5 doesn't absorb water from the air where DOT3 & DOT4 do.
Normally when you switch to DOT 5 you will need to reseal both the master and slave cylinders with compatible DOT5 seals. The same is true if you went the other way. And don't forget to thoroughly clean out the lines, any traces of the old fluid can cause problems. It is probably best to replace the hose with a new one while your doing it.
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