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Old 02-26-2011, 05:35 PM   #1 (permalink)
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Pinion Angle

I got a question about Pinion angle. I have a 92 F250 with 6" suspension and 3" body lift with 38.5s its got the 460 big block in it with a 5 spd trans. I broke my u-joints for the front driveshaft and was told i need to lower my tcase bc my yokes are binding together. The question is how far do I need to drop the tcase and whats the best way to do so? Also would it be a good idea to put shims on my front axle to adjust the angle for that part of the driveshaft?
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Old 02-26-2011, 06:53 PM   #2 (permalink)
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If the yoke heads are binding when turning grind a little off the U joint yokes to give a little more clearance.. not a lot of metal needs to be removed just a little in the right spot. so droop out the suspension, turn the shaft by hand and see where its contacting each other and just round the edges a bit. Or spend some dough on a high clearance shaft
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Old 02-26-2011, 07:12 PM   #3 (permalink)
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Quote:
Originally Posted by Clendo87 View Post
I got a question about Pinion angle. I have a 92 F250 with 6" suspension and 3" body lift with 38.5s its got the 460 big block in it with a 5 spd trans. I broke my u-joints for the front driveshaft and was told i need to lower my tcase bc my yokes are binding together. The question is how far do I need to drop the tcase and whats the best way to do so? Also would it be a good idea to put shims on my front axle to adjust the angle for that part of the driveshaft?
Possible solutions:

1. Clearance yokes as mentioned above, remove minimal material.
2. Get a F-350 double cardain driveshaft and matching transfercase yoke.
3. Clock t-case down and fab a new transmission crossmember ($$$).
4. Shimming up the pinion will affect castor, possibly leading to alignment issues, i.e. Death wobble, steering return to center, ect. and maybe binding up the center pivot bushings.

Are you still running the D50 TTB?

Edit, I am running a Shackle Reversal kit on my D60 with 6" springs (~8.5" of lift) with the F-350 shaft and it needed very minimal clearancing of the yoke and still just clears the factory crossmember.

Last edited by f350n4.6ranger; 02-26-2011 at 07:17 PM.
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Old 02-26-2011, 07:25 PM   #4 (permalink)
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For 6 inches you should be able to clearance as mentioned above. I have 15 inches of lift on my 01 Excursion and my front shaft runs at 30 degrees with no binding. You just have to become good friends with a die grinder
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Old 02-26-2011, 11:21 PM   #5 (permalink)
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Thanks guys and I have a death wobble already bc of my super swampers lol but im sure i can make the x member
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Old 02-27-2011, 12:04 AM   #6 (permalink)
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Its really easiest to just clearance the yokes, 10 minute job max and it'll work great. I run 10" of lift on my F350 and I just ground the yokes minimally and extended it a few inches. I really see no need here to drop the T case for a 6 Inch lift..
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Old 02-27-2011, 12:09 PM   #7 (permalink)
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So grind the yokes on the driveshaft only?
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Old 03-03-2011, 05:41 PM   #8 (permalink)
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I forgot to mention in my 1st post that my driveshaft is rubbing up against my tranny x member on a flat surface so im sure with some flex it will just bust u joints left and right that was the reason that I asked if I should lower my x member.. Or could I get away with notching it to give it the clearance that I need?
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