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Author Topic: Drive shaft length  (Read 385 times)
5258
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Drive shaft length
« on: October 15, 2007, 11:40:50 AM »

Fixing to change out the punny 7 1/4 rear and drop in a 8 3/4, running a four speed, Does anyone know what the drive shaft length will be needed for the swap. I know my current length will not work but I have cut and welded one before so the work would not be an issue, trying to get idea for what the length diference is.

Thanks
5258
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5258 Performance  Shelbyville, Tennessee "Where the MOPAR factory built and race ready hotrods live again"
Jim_Lusk
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Re: Drive shaft length
« Reply #1 on: October 15, 2007, 12:11:05 PM »

Since every car is different I like to measure for mine. Put the yoke all the way in the transmission and with the suspension loaded measure center to center on the yokes. Subtract 3/4" and you'll be good.
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Re: Drive shaft length
« Reply #2 on: October 15, 2007, 02:00:39 PM »

When you do the measuring, make sure ALL the weight is on all 4 tires, if you don't the shaft will not fit.
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bOb shingler
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Re: Drive shaft length
« Reply #3 on: October 15, 2007, 02:31:58 PM »

When you do the measuring, make sure ALL the weight is on all 4 tires, if you don't the shaft will not fit.
  it'll be the measurement from the center of the rear end yoke to the seal rim on the trans less 3 1/2".
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doug 371
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Re: Drive shaft length
« Reply #4 on: October 16, 2007, 09:34:58 PM »

factory service manuals show the stock lengths...if u need length for a dart i can help but no manual for a duster
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Re: Drive shaft length
« Reply #5 on: October 17, 2007, 02:34:39 PM »

Yes need for a 4 speed / 8 3/4 69 dart combo.

Thanks
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Re: Drive shaft length
« Reply #6 on: October 17, 2007, 06:58:35 PM »

For a 4 speed and 8-3/4 the length is 48.6"

An 340 and Big Block, 727 and 8-3/4 length is 44.88

This is from a 1968 plymouth service manual 
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Re: Drive shaft length
« Reply #7 on: October 17, 2007, 08:59:58 PM »

Like Jim said: Don't forget the 3/4". I put it all together and haul it to the driveline shop and let em measure it thenselves and then they fabricate it.
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Re: Drive shaft length
« Reply #8 on: October 17, 2007, 11:21:18 PM »

For a 4 speed and 8-3/4 the length is 48.6"

An 340 and Big Block, 727 and 8-3/4 length is 44.88

This is from a 1968 plymouth service manual 
he needs the info for a dart not a plymouth...my dodge manual says 51.53"
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