Am I getting screwed? 8" Donahoe - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 09-26-2006, 01:31 PM Thread Starter
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Am I getting screwed? 8" Donahoe

Hey everyone,

Ive got a 2003 F350 CrewCab Longbed 6.0. I ordered the 8" Donahoe kit with carrier bearing drop kit and adjustable pan rod bar. After a couple weeks of waiting it finally arrived at Eastside Custom Trucks in washington to get installed. I have been very skeptical of them but didnt know of anyone else to install it. I called today to come pick up my rig (was already there for a full day), and they told me the rear driveshaft wasnt long enough. I called Donahoe and another offroad shop and they all said it should be long enough. Anyways, I had them take it to a driveline shop to be lengthened because I just need my truck done. Does anyone know if this is crap or if it actually needed to be lengthened. Hopefully 3 days after I drop it off an 8 hour job will be done.

Sorry for the rant, Ryan
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post #2 of 3 Old 09-26-2006, 04:15 PM
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Originally Posted by trackmagic View Post
Hey everyone,

Ive got a 2003 F350 CrewCab Longbed 6.0. I ordered the 8" Donahoe kit with carrier bearing drop kit and adjustable pan rod bar. After a couple weeks of waiting it finally arrived at Eastside Custom Trucks in washington to get installed. I have been very skeptical of them but didnt know of anyone else to install it. I called today to come pick up my rig (was already there for a full day), and they told me the rear driveshaft wasnt long enough. I called Donahoe and another offroad shop and they all said it should be long enough. Anyways, I had them take it to a driveline shop to be lengthened because I just need my truck done. Does anyone know if this is crap or if it actually needed to be lengthened. Hopefully 3 days after I drop it off an 8 hour job will be done.

Sorry for the rant, Ryan
Don't know about that one man, someone here surely will know something about that.

2003 6.0 F350 dually on high cholesterol fuel (WVO)
2000 7.3 Excursion also on a high cholesterol fuel



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post #3 of 3 Old 09-26-2006, 04:21 PM
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With the drop kit it should be close, but I still think it would need to be lengthened. Using a therom I learned in grade school, lets look at it this way. Asquared + Bsquared = Csquared. A = length of truck from trans to directly above where the driveshaft connects, B = length from the driveshaft connection up to the point just mentioned. C = your driveshaft.

If you increase A or B you will obviously have a different length needed for C. However there is leeway available in the driveshaft for a few inches increase or decrease for things like suspension travel, load bearing, etc... That coupled with the carrier drop kit should put it close, but I needed a longer driveshaft on my Mazda with only a 6" lift. It would work, until I got on it or spun the tires and then the rear would move under the torque and the driveshaft would pull out some and the splines would break. I think lengthening the driveshaft is a good idea. An even better idea is to get a once piece driveshaft but that's just me.

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