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Old 08-12-2007, 11:30 AM
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Swapping 3rd Members, different pinion attachment

I put a Ford 9" in my 67 Chevy C10 which I thought had 3.55 gears, unfortunately its not. The ratio is much higher, like 4.10 or something. I want to swap the third member with another one I have, but the spare one is from a Granada/Monarch and has a different pinion attachment [CV? vs U-joint]. See pictures for clarification. The spare unit has 2.75s, not ideal but I want to try it vs. the other gears. Motor is fresh but not built 350.

I am wondering if I can move the U-joint pinion attachment to the spare third member without disrupting the pinion setup in that third member? And if so how would one go about holding that pinion attachment in place in order to get the nut out of there? I do have air and an impact driver. Thanks for any tips!

Pictures 1 and 2 are the spare rearend, 3rd picture is the setup currently in the truck.
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Last edited by BIGSKY; 08-12-2007 at 11:37 AM.
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Old 08-12-2007, 11:43 AM
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You should be able to swap that over. The easiest way to get that off is with a good 1/2 impact wrench. If not I have used a breaker bar and have held the yoke with a pipe wrench
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Old 08-12-2007, 11:56 AM
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Ford made and installed many different types and styles of yokes.
They can be changed ... but you will ruin the pinion load set up if not real careful. ( Then you have a useless, noisy rear end ) ...

I prefer to change the yokes ... with the center section out of the rear end ... so I can look at the pattern when I am finished.

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Old 08-12-2007, 12:54 PM
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Quote:
Originally Posted by Deuce
They can be changed ... but you will ruin the pinion load set up if not real careful. ( Then you have a useless, noisy rear end ) ...

I prefer to change the yokes ... with the center section out of the rear end ... so I can look at the pattern when I am finished.

That is my concern, if I get all ham fisted while getting the yoke off that I will mess up the pinion setup.

I thought about removing the third member first but I am not sure I can hold it properly if its not in the housing.
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Old 08-12-2007, 03:52 PM
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If you don't have a impact then you probably dont have torches?? The dealer tool I saw once had a rectangle shaped hole in a long flat tool. Place it over the yoke and let it hit the frame, then use a BIG breaker bar. You could make one with torches and some wide scrap metal.

I have not done a 9 inch. I can't see how a yoke change can affect the wear pattern on the teeth, because that is set by the shim under the inner bearing. But it could change the preload on the inner & out bearings. Look on google for a 9 inch ford page, there must be plenty out there. If not, I can try to look in an old Motors manual about the preload issues.

BTW, that 2.7 gear should work fine with a stock 350 on the wide open roads there....unless it's all big mountains
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Old 08-13-2007, 02:23 PM
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Quote:
Originally Posted by F&J
BTW, that 2.7 gear should work fine with a stock 350 on the wide open roads there....unless it's all big mountains
Yea, I am excited about trying the new gears, highway cruising should be nice. There are lots of big mountains but I don't take my shiny truck up there!

Well I got the yoke off by using a 4' breaker bar. It came off nice and slow, no sudden breaking loose, so I will pull the third member off my truck and put this 2.75 one in. I'll look up what the torque should be on my yoke.
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Old 08-14-2007, 12:48 AM
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Got it all apart, but I realize now that I have to swap out that plate that holds the pinion to the third member also. Its a shrouded type [a guess on terminology] and I don't think my yoke for the u-joint will work with that one. I removed this shrouded yoke plate and have the pinion removed from the third member, so I assuming that I am at square one basically as far as lash setup and will have to have my third member assembled by someone who knows how to do that, is that correct?
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