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my man. box was leaking, took it to a shop, needs rebuilding, 61/2 turns off car, seems excessive, unsure if it is original? are they date coded? my books dont have any info? all the same? i have heard 3 1/2 turns etc etc, are they different for the f41 suspension or just the pitman arm length? thanks
 

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I had a buddy with a 69 Z/28 that had close to 7 turns lock to lock.
There are two manual box ratios, a slow and a fast. There are two lengths of pitman arms, long and short, and three lengths of outer steering arms.
I have some PS ratio and arm info on my web page. I haven't tackled manual ratios because researching PS ratios scrambled my brains!
David
 

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My 69z's suspension was original and needed to be rebuilt. 6.5 lock to lock out of the car is correct fo rthe standard z steering. It is about 3.5 in the car due to the linkage. The only difference is the pitman arm like David Pozzi said. His website is awesome if you have a chance to view it. They tend to leak out the bottom on the worm gear adjuster. You can buy a fast ratio or stock from discount steering. I've rebuilt mine twice so far and it stops leaking for a couple years. Headers make the problem worse since the box gets a lot hotter than usual. Good Luck.
 

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The cooling is hindered by headers that do not fit , for what ever reason.

If you are trying to find the date code,, there is a little machined tab near the top cover that will have a 5 digit number stamped.. Do a search on this site and it will decode that number. My manual box was something like B 2908 which coded out like the 290th day of year 1968. The casting number was generic. As you mentioned, 6 turns out of car but 3 turns hooked up. It was out of my factory Z.
 

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manual boxes are just packed with wheel bearing grease, very minimal sealing, but headers running close to box(as they all do) heat some grease up to oil consitincy and the seals were never designed to seal to oil. i have actually seen boxes that prople have added gear oil to and it will leak like hell, a good hi-temp grease will work the best but after long driving and headers, leaks hard to stop on thr units, Rob...
 
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