Hyd Clutch swap, what master cylinder? - JeepForum.com
 
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post #1 of 13 Old 07-29-2007, 01:26 PM Thread Starter
BMac4x4
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Hyd Clutch swap, what master cylinder?

I got a 78 CJ with a full fiberglass body and a full chevy drive train in it. The 700r4 that it had when i bought it is toast and i'm swapping to a SM465 with a hyd clutch. I know this has been done before so i'm looking to find out what my options are as far as a clutch master cylinder set up goes. Can someone point me in the right direction?


78' CJ7 - nothing origional but the frame. Full fiberglass body, Vortec 350 with a Holly dubble pumper and malory ignition, SM465 trans, NP208 t-case, Chevy 1 ton rear w/ disc brakes and 3/4 ton front, 4.56 gears, 4" lift springs SOA and 2" body, 42" TSLs.
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post #2 of 13 Old 07-29-2007, 02:08 PM
jayhawkclint
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I used a stock XJ Cherokee MC with Wilwood slave. Works good. With a little modification, you can bolt the whole vac booster and pedal assembly in as a unit and have power brakes, too.


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post #3 of 13 Old 07-29-2007, 04:06 PM Thread Starter
BMac4x4
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What did you use for a pedal? Stock CJ pedal or one from another vehicle? And how did you connect the rod from the master to the pedal? And yeah power breaks are nice, i have a chevy brake booster in it.

78' CJ7 - nothing origional but the frame. Full fiberglass body, Vortec 350 with a Holly dubble pumper and malory ignition, SM465 trans, NP208 t-case, Chevy 1 ton rear w/ disc brakes and 3/4 ton front, 4.56 gears, 4" lift springs SOA and 2" body, 42" TSLs.
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post #4 of 13 Old 07-29-2007, 06:16 PM
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I used the whole XJ setup and modified the pedals to fit. There is another thread somewhere around here that I showed some pics, or you can sift through my build thread link in my sig line.

Clutch pedal, modified on top, stock on bottom:

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post #5 of 13 Old 07-29-2007, 11:00 PM Thread Starter
BMac4x4
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So in your experience with that setup, do you think the stock CJ pedal can also be modified to work with an XJ master cyl?

78' CJ7 - nothing origional but the frame. Full fiberglass body, Vortec 350 with a Holly dubble pumper and malory ignition, SM465 trans, NP208 t-case, Chevy 1 ton rear w/ disc brakes and 3/4 ton front, 4.56 gears, 4" lift springs SOA and 2" body, 42" TSLs.
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post #6 of 13 Old 07-30-2007, 02:02 AM
jayhawkclint
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Some people run into trouble there because of rod length/stroke/leverage ratio/etc. With enough fiddling, anything is possible. I just decided the simplest way to make it work was to take a set of components that I knew worked well in one vehicle, and swapped them over to another.

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post #7 of 13 Old 07-30-2007, 05:03 PM
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Does the muncie bellhousing have a mount tab for the slave cyl? If so, I think the ealrly eighties cj's with the four cyl basiclly use a chevy set up. If I'm right it would all bolt in (except for the pedal maybe), but it would all work together just fine.

'81 CJ5, efi 302, AX-15 5 spd, On Board Air, wrangler spring conversion, Astro van Hydro Brakes.
Soon: Custom cut Dana 44 front, wide trac solid axle amc 20 rear, SOA,
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post #8 of 13 Old 07-30-2007, 05:48 PM
jayhawkclint
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Chevy bell housings use a push-type slave that mounts on a tab. Very plentiful in the junkyards; just about any Chevy truck will work.

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post #9 of 13 Old 07-30-2007, 07:03 PM Thread Starter
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I think i'm gonna get a Master from a full size chevy and fab it up to work. I've come up with a couple ideas so far. I figure the Chevy master will work well with the chevy slave so that would be the best route. I don't want to get a master all fabed up and realize that it isn't big enough to fill the slave cyl all the way and the clutch doesn't fully disengage. When its all done i'll post some pics of how it looks and how it worked out.

78' CJ7 - nothing origional but the frame. Full fiberglass body, Vortec 350 with a Holly dubble pumper and malory ignition, SM465 trans, NP208 t-case, Chevy 1 ton rear w/ disc brakes and 3/4 ton front, 4.56 gears, 4" lift springs SOA and 2" body, 42" TSLs.
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post #10 of 13 Old 07-30-2007, 11:20 PM
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YJ clutch and brake pedals will bolt right in to a CJ and have the HYD clutch tab already on them. Just might have to fiddle with the brake pedal a little.

80 CJ5 in the process of a frame up resto
96% complete.
The little stuff will kill me.
On the back burner for college.
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post #11 of 13 Old 07-31-2007, 02:39 AM
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Quote:
Originally Posted by BMac4x4
I think i'm gonna get a Master from a full size chevy and fab it up to work. I've come up with a couple ideas so far. I figure the Chevy master will work well with the chevy slave so that would be the best route. I don't want to get a master all fabed up and realize that it isn't big enough to fill the slave cyl all the way and the clutch doesn't fully disengage. When its all done i'll post some pics of how it looks and how it worked out.
It's all about the bore size. Make sure the MC isn't bigger than the slave. Preferrably the would be the same.

'81 CJ5, efi 302, AX-15 5 spd, On Board Air, wrangler spring conversion, Astro van Hydro Brakes.
Soon: Custom cut Dana 44 front, wide trac solid axle amc 20 rear, SOA,
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post #12 of 13 Old 07-31-2007, 11:13 AM
rnjcrsh
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Here are some ghetto fab pics at its finest. Maybe you can get some adaptation ideas.

http://webpages.charter.net/xlr8n/pics/jeep/slave2.jpg

http://webpages.charter.net/xlr8n/pics/jeep/slave3.jpg

I have a clutch pedal very similar to the one in the image closest the camera that jayhawkclint posted. You can have it, simply pay shipping.
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post #13 of 13 Old 08-02-2007, 04:51 PM Thread Starter
BMac4x4
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Quote:
Originally Posted by rnjcrsh
Here are some ghetto fab pics at its finest. Maybe you can get some adaptation ideas.

http://webpages.charter.net/xlr8n/pics/jeep/slave2.jpg

http://webpages.charter.net/xlr8n/pics/jeep/slave3.jpg

I have a clutch pedal very similar to the one in the image closest the camera that jayhawkclint posted. You can have it, simply pay shipping.
I prefer to call that redneck engineering! I'm gonna have a little of that on the master cyl rod where it connects the pedal. Thanks for the offer on the pedal but i'm gonna use the CJ one. I'll post some pics when its done tomorrow.

78' CJ7 - nothing origional but the frame. Full fiberglass body, Vortec 350 with a Holly dubble pumper and malory ignition, SM465 trans, NP208 t-case, Chevy 1 ton rear w/ disc brakes and 3/4 ton front, 4.56 gears, 4" lift springs SOA and 2" body, 42" TSLs.
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