2 piece driveshaft help
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From: Sandy Eggo
2 piece driveshaft help
I'm trying to track down some weird vibrations that are coming from the driveshafts. truck is a 77F350, 460/C6. its got a 2 piece driveshaft. u-joints and carrier bearing are all fresh, and i'd tried clocking the two pieces every way imaginable to cure the vibes. its just on the freeway above 50
what trips me out is that there are 2 slip yokes. there is a slip yoke at the transmission output, but then there is a slip yoke at the carrier bearing too. so the first driveshaft is essentially floating. there is nothing holding it front/back in the truck. the rear shaft is a solid one piece type with no slips (the female slip is on the u joint yoke). the slip yokes all seems tight.
i've just never seen a 2 piece where the intermediate shaft is "floating"? is this normal?
what trips me out is that there are 2 slip yokes. there is a slip yoke at the transmission output, but then there is a slip yoke at the carrier bearing too. so the first driveshaft is essentially floating. there is nothing holding it front/back in the truck. the rear shaft is a solid one piece type with no slips (the female slip is on the u joint yoke). the slip yokes all seems tight.
i've just never seen a 2 piece where the intermediate shaft is "floating"? is this normal?
Fleet Owner
Joined: Dec 2009
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From: NorCal
Your configuration sounds right. The front driveshaft is secured by the carrier bearing and should not move forward or back.
Are you doubly sure that the yokes and driveshaft are phased correctly?
Are you doubly sure that the yokes and driveshaft are phased correctly?
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Senior User
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From: Sandy Eggo
hmm, the shaft definitely moves in the carrier bearing. i need to replace the output bushing on the trans, looks like i'll have to get creative on this. i just couldn't remember cause every other 2 piece driveshaft i had only had 1 slip yoke, but they were 4x4 trucks with fixed outputs.
and yup, even found the spicer master driveshaft catalog to be sure. proper setup is technically out of phase, so that the yoke at the trans output and pinion see it as a 1 piece driveshaft in phase.
and yup, even found the spicer master driveshaft catalog to be sure. proper setup is technically out of phase, so that the yoke at the trans output and pinion see it as a 1 piece driveshaft in phase.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
hmm, the shaft definitely moves in the carrier bearing. i need to replace the output bushing on the trans, looks like i'll have to get creative on this. i just couldn't remember cause every other 2 piece driveshaft i had only had 1 slip yoke, but they were 4x4 trucks with fixed outputs.
and yup, even found the spicer master driveshaft catalog to be sure. proper setup is technically out of phase, so that the yoke at the trans output and pinion see it as a 1 piece driveshaft in phase.
and yup, even found the spicer master driveshaft catalog to be sure. proper setup is technically out of phase, so that the yoke at the trans output and pinion see it as a 1 piece driveshaft in phase.
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