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#241
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Also, mine is 3.5" steel. If you do an aluminum, I would have it sized smaller in the last 12" or so if you can, because mine wants to hit right at the back of the back seat tray, right where the rear seat bottom catch is in a hard bump like right on the bumpstops. The stock driveshafts were stepped in the back this way. Again, 70 may be different. I did not do aluminum because usually you have to go a size bigger in aluminum to keep the strength and I knew I did not want any more clearance issues.
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#242
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Keep me posted. I am curious to see how you do with your vibration issue. Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
#243
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You know, that's a very good point, many shops balance using the 60 mph sweet spot, and in many case that isn't even close. I know there are some cheaper balance machines that don't have as good a tolerance either, and I had to scout around to find one that will balance to my liking.
I think you may be over-engineering this issue, (something I'm guilty of regularly!), and is probably simpler than all this. Call Denny's or Inline, or Dutchman, any should be able to give you a lot of info. I would also stick with 1350s by the way. I still say that diag tool that uses the harmonic freq to point you in the right direction is the ticket. That gets away from looking at it from a just angles point of view. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#244
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I may have to stick with the 1350 u-joints, since there are yokes available to use CV joints. Although, the CV joints are a very elegant solution. They are used extensively on cars that are made to run at very high speeds for sustained periods of time. On the other hand, 1350 u-joints are used on trucks...just saying...LOL Here is a link to the 2005+ Mustang driveshaft that Frank is coming out with: http://driveshaftshop.com/blog/?p=440 Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
#245
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Ok, I have to admit, I haven't gone through all the posts regarding the vibration issue, though over this weekend, I will. I just got back from New Orleans, and trying to catch up here at work...
I did see on post 160 you mention there .038 run out at the shaft, and that's enough to cause a vibration I believe. You say the rear is pretty fresh? You've double checked the pinion and carrier bearings? Figured you have, but asked anyway! I went through a little chase-my-tail initially with my vibration issue, since the pinion yoke took out a u-joint, replaced that, took out a tailshaft bushing, replaced that, and also took out a pinion bearing. By this time I had to replace the u-joint again. Maybe you're just suffering a little of the same karma, have to do it all at once or something? Just taking a stab, and sure at some point the light will come on and you'll go "Oh yeah!" and knock it out. I'm curious, let me know when you do figure it out, will make a mental post-it note. If something comes to mind over the weekend after going through all the posts, I'll post any ideas. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#246
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I will definitely report back soon on it. I agree that u joints are such an archaic way of doing it, but it is strong. I don't know if cv joints can take the kind of abuse that a stick shift launch puts on a joint. Is there more stress on a driveshaft joint or a half shaft going to the wheel? Seems like there would be more torque on a half shaft, but maybe less impact do to gear reduction? |
#247
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Andrew,
Just read through most of this thread. It's neat to see the progression all right here lined out and easy to follow. Knowing the overall story of your GTO since you first got it and we first became friends, I hafta say just how proud I am of you and how far you've come over the years! Kudos to you my friend. Talk to you soon. Rory
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Never trust a fart. They sometimes suprise you. http://community.webshots.com/user/motornoggin http://motornoggin.smugmug.com/ |
#248
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The 108mm CV that The Driveshaft Shop uses can handle over 7000lb/ft of torque. That's about the same as a 1350 u-joint. Torque capacity should not be an issue. They use the CVs for various late model cars like the 5th gen Camaros. Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
#249
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Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
#250
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That would be great! You're always welcome my friend!
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Never trust a fart. They sometimes suprise you. http://community.webshots.com/user/motornoggin http://motornoggin.smugmug.com/ |
#251
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So, would you have a CV joint in the back too or just the front? Seems like you are still going to have to deal with at least some slop introduced into the driveline by the splines and the slip joint at the trans. If that is the source of our problems, then we may be screwed.
I guess I just always thought it was a wheel and tire balance issue. I mean, these guys at these shops just balance your tires at like 30 mph and thats when they are new, a couple of burnouts later, they have to have changed. IMHO |
#252
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I don't know alot about driveshaft balancing, but by my calcs, the driveshaft is cranking over 3300 rpms at 75 mph. That is assuming a 28" tall rear tire. So I could see where that would create a vibration if everything wasn't koser. And the heavier the driveshaft the more problem a little slop would cause. It would be cool to throw another driveshaft in it, escpecially a lighter aluminum one just to see about the vibration issue would change.
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#253
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Quote:
Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
#254
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How does the cv attach to the slip yoke? And is there a special pinion yoke that bolts to the pinion and bolts to the CV?
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#255
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Today I actually told Frank to move forward on this project. He will make me the yoke and I will mock it up for proper driveshaft length. Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
#256
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So you are thinking that it is too much working angle of the u-joints then that is causing the vibration, and not the driveshaft being out of balance?
So it seems like a really good plan. What material for the driveshaft? What diameter? |
#257
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Here are some neat details about the CF shafts: http://driveshaftshop.com/blog/?p=546 My shaft will look very similar to the 2010 Camaro driveshaft. Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
#258
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I don't think you are taking a shotgun approach. You have eliminated most of the elements of the car in a very scientific manner to a few remaining components. It is too bad though that you will be replacing several components at once. You won't really know which one fixed it that way, but hopefully it will be fixed and that is all that matters anyway.
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#259
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I am interested in your results. I have been fighting a vibration in my pickup for years. I would be very interested in doing the cv joint setup if it works.
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Tod Hoffmann 1966 GTO Montero Red Hardtop - Holley EFI'd 462, KRE DPorts/Muncie 4spd 1990 Chevy 454SS pickup - Accel DFI/T56 6spd - Hot Rod Power Tour Long Hauler 1996 Chevy K2500 ECSB 'Poopy' 2002 Honda VTX1800C 2016 Cadillac CTS Premium My project thread: http://forums.maxperformanceinc.com/...d.php?t=516826 |
#260
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Quote:
Andrew
__________________
IG: projectgattago Please get in touch for Holley EFI tuning services. "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." |
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