drive shaft for my charger ?
#3210772
02/05/24 10:50 AM
02/05/24 10:50 AM
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Joined: Sep 2003
Posts: 19,383
north of coder
moparx
OP
"Butt Crack Bob"
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OP
"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,383
north of coder
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wanting to replace the driveshaft on my charger. 440/727/8 3/4 combo. the 8 3/4 will stay, and currently has a 741 case with 3.91 gears and a 7260 joint size yoke. the reason for a new shaft is the one front ear on the shaft has started to egg-out, with a just susceptible play noticeable. my plan is a billet or forged front yolk, 1350 joint sizes on both ends of the shaft, and a conversion 1350/7290 joint at the rear, as i have a 7290 yolk for the 741 case. [or i may spring for a quality 7290 yolk] what i am finding, however, is there are no solid 1350/7290 conversion joints out there. they all seem to be the greasable type. i would prefer a solid joint. i also want a high speed balance. [i think] denny's driveshafts offer a 10k rpm balance. i have also looked at doc diff's stuff as well. any thing i'm missing, or other suggestions ? TIA !  
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Re: drive shaft for my charger ?
[Re: moparx]
#3210790
02/05/24 12:00 PM
02/05/24 12:00 PM
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Joined: Feb 2004
Posts: 34,883
S.E. South Dakota !
bigdad
Still Posting A Lot
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Still Posting A Lot
Joined: Feb 2004
Posts: 34,883
S.E. South Dakota !
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guess we are lucky here in my little town, we have a high quality torque tube builder here , I did buy a HD yoke from doctor diff
The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6
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Re: drive shaft for my charger ?
[Re: bigdad]
#3210793
02/05/24 12:04 PM
02/05/24 12:04 PM
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Joined: Sep 2003
Posts: 19,383
north of coder
moparx
OP
"Butt Crack Bob"
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OP
"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,383
north of coder
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there are a couple of shaft builders around here that are within 40 miles, but they are truck places, so their balance is only around 500-750rpm. that's why i'm asking about high speed balance. theirs might be ok for dirt burners, but not me.
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Re: drive shaft for my charger ?
[Re: moparx]
#3210875
02/05/24 04:56 PM
02/05/24 04:56 PM
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Joined: Jan 2003
Posts: 74,996
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,996
U.S.S.A.
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wanting to replace the driveshaft on my charger. 440/727/8 3/4 combo. the 8 3/4 will stay, and currently has a 741 case with 3.91 gears and a 7260 joint size yoke. the reason for a new shaft is the one front ear on the shaft has started to egg-out, with a just susceptible play noticeable. my plan is a billet or forged front yolk, 1350 joint sizes on both ends of the shaft, and a conversion 1350/7290 joint at the rear, as i have a 7290 yolk for the 741 case. [or i may spring for a quality 7290 yolk] what i am finding, however, is there are no solid 1350/7290 conversion joints out there. they all seem to be the greasable type. i would prefer a solid joint. i also want a high speed balance. [i think] denny's driveshafts offer a 10k rpm balance. i have also looked at doc diff's stuff as well. any thing i'm missing, or other suggestions ? TIA ! If you are going to replace the rear yolk why not just get a 1350 yoke instead of doing the conversion u joint you are already changing out the yolk anyways.
running up my post count some more .
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Re: drive shaft for my charger ?
[Re: JohnRR]
#3210917
02/05/24 07:29 PM
02/05/24 07:29 PM
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Joined: Jan 2007
Posts: 10,132
A Red State
SNK-EYZ
I Live Here
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I Live Here
Joined: Jan 2007
Posts: 10,132
A Red State
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wanting to replace the driveshaft on my charger. 440/727/8 3/4 combo. the 8 3/4 will stay, and currently has a 741 case with 3.91 gears and a 7260 joint size yoke. the reason for a new shaft is the one front ear on the shaft has started to egg-out, with a just susceptible play noticeable. my plan is a billet or forged front yolk, 1350 joint sizes on both ends of the shaft, and a conversion 1350/7290 joint at the rear, as i have a 7290 yolk for the 741 case. [or i may spring for a quality 7290 yolk] what i am finding, however, is there are no solid 1350/7290 conversion joints out there. they all seem to be the greasable type. i would prefer a solid joint. i also want a high speed balance. [i think] denny's driveshafts offer a 10k rpm balance. i have also looked at doc diff's stuff as well. any thing i'm missing, or other suggestions ? TIA ! If you are going to replace the rear yolk why not just get a 1350 yoke instead of doing the conversion u joint you are already changing out the yolk anyways.  If you can get a 1350 size yoke for it why not go that route?
Kayse can't keep up at all now. lol
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Re: drive shaft for my charger ?
[Re: 67_Satellite]
#3211067
02/06/24 10:34 AM
02/06/24 10:34 AM
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Joined: Sep 2003
Posts: 19,383
north of coder
moparx
OP
"Butt Crack Bob"
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OP
"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,383
north of coder
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you guys are right, i might as well cough up for a 1350 yoke as well. the only reason i was thinking 7290, was i had one of those yolks on the shelf. i only want to do this once. this car is heavy, but it will never have lots of hp or dead hook, so by going overboard on a shaft, i shouldn't have to worry about this part for the rest of my time here. any suggestions on upgraded straps for the yoke ? what about ARP bolts for the yolk, or will common grade 8 bolts be ok ?
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Re: drive shaft for my charger ?
[Re: moparx]
#3211083
02/06/24 11:19 AM
02/06/24 11:19 AM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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Are the yokes different for 741 vs 742?
I switched over to 1350's years ago on everything.
Not sure I understand your need for a solid 1350, seems like a greaseable 1350 joint on the street has advantages.
Also seems grade 8 is quite adequate for the application.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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They are different in the interior length and curve part that holds the U joint in the yoke, the pinion yoke is deeper than the center of the U joint cups so they, the cups, are not being held into the pinion yoke by the straps, the pinion yoke is doing that by being longer in the seat than the cup is to its center 
