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Author
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Topic: Driveshaft lenth 8" vs. 9" rear end
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H8CHEVY
Gearhead Posts: 255
From: Southern Cali
Registered: Jun 2000
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posted 04-20-2001 02:37 AM
   
I was wondering if anyone can tell me if the driveshaft that I have with my 8" will need to be altered when I install the 9" rear end in my car???? thanks.......
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ccode67
Gearhead Posts: 1275
From: douglasville,ga,usa
Registered: Mar 2001
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posted 04-20-2001 06:54 AM
It depends on the yoke, they do have small short yokes which mean you can reuse the u joints and not have to modify the length of your driveshaft.------------------
67 stang 5 speed
91 f-150 xlt
98 explorer xlt sohc v-6
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steve'66
Gearhead Posts: 5272
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-20-2001 10:02 AM
I agree w/ ccode. It worked on our '66 w/o changing the driveshaft, but we did need a special u-joint because the short small yoke on our 9" was made for a larger dia. u-joint bearing cap.SteveW
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TomP
Gearhead Posts: 4551
From: Delta BC Canada
Registered: Dec 99
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posted 04-20-2001 07:06 PM
Stevesmall U-joints  thats something that should be changed before it breaks ,or will need to be after! The big U-Joint short yoke and large joint slip yoke should be easy enough to find, look at the T5 yokes to fit that toploader. Then a big U-Joint driveshaft can be gotten from a wrecker just measuring the center-to -center length . (guessing 49-50")
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steve'66
Gearhead Posts: 5272
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-20-2001 07:48 PM
Tom,Thanks for the tip! I'll keep an eye on it. But so far so good.... Maybe when it hooks?!?!? I've got a trailer so if it does break it'll get a ride home. LOL SteveW
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jjy
Journeyman Posts: 22
From: bedford, pa 15522
Registered: Apr 2001
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posted 04-21-2001 09:57 PM
i switched in a 9" a few weeks ago. i had to shorten the driveshaft about an inch and a half with the 9" in. my yoke bolted right up, just measure how much needs to be taken off the driveshaft to allow 1/2 to 1 inch of the slip yoke to hang out of the trans, just enought to bolt everything up. the machine shop charged me $40, i think.
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