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Old 12-28-2010, 07:58 PM   #1
ah_5500
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bore

went to buy some rear cylinders for the old drums yesterday and they asked me what bore. 1inch or 1 1/8 inch. kid at counter was as stumbled as me. i know this is bound to be a stupid questions to some but regardless of my bad wisdom i still need to know how to find out which i have. thanks
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Old 12-28-2010, 08:01 PM   #2
vectorit
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Re: bore

What ya got?

1/2 ton or 3/4 ton?
Any idea on axle? Dana or Eaton?
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Old 12-28-2010, 08:11 PM   #3
ah_5500
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Re: bore

67 shortbed 283/powerglide with powerbrakes and 2wd 1/2 ton

Last edited by ah_5500; 12-28-2010 at 08:11 PM.
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Old 12-28-2010, 08:55 PM   #4
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Re: bore

I'm taking a wild guess here, and hopefully some one else will chime in.

In my case, it didn't really matter the bore size. What did matter, was the position of the inlet for the brake line.

Best bet would be to take out the old one, and head over to a Napa store since they tended to have them in stock in my case. Then compare yours to what their puter is telling them to sell you.

I went through a couple of purchases before I got the right ones, and that's because I didn't bring in my original ones. Those things get changed out so often over the years, that what you have in there may be completely different from what it came with.

Oh, and I checked my "big book" to see if there was any references to the bore size of a wheel cylinder and there were none made. Though, my book is for a 68. Not that that should really matter, since they are so much alike.

Good luck!

Oh, and take this opportunity to replace your rubber brake lines if they are old! Takes nothing to replace them, except for a few extra bucks and a whole lot more piece of mind. Also, flush out ALL of the old fluid. Otherwise you will be doing this again sooner than later, since the old fluid is probably full of contaminates, grit, and water.
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Old 12-28-2010, 09:02 PM   #5
hayhauler71
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Re: bore

If you take the wheel cylinder apart sometimes the rubber cup will be marked or you can measure the bore when it is apart.
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Old 12-28-2010, 09:23 PM   #6
ah_5500
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Re: bore

thanks for the advice guys. and the fluid was all new since i just put rear shoes on it and did all the 5 lug swap stuff. ill check out both ideas. i was hoping to know which i needed so i could just get it on my way home before i tore it apart. thanks again
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Old 12-28-2010, 10:57 PM   #7
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Re: bore

buy them both, and return the one you don't need
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