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#1
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Pinion angle vibration
Are pinion angle vibrations speed/rpm dependent like tire vibrations or is it a go/no go proposition? My car is smooth as silk at 50 but at varying speeds up or down I have a driveline vibration I am chasing.
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#2
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In my experience it was similar to what you stated also. On my 71 GP SJ after rebuilding the entire car, I had that issue and did eliminate it after adjusting the pinion angle. The fully adjustable upper control arms helped make this easier. Tremec has a nifty app for phones that can help dial in the proper angle in reference to your driveshaft/transmission angle. Lots of other info on this out there. Hope this helps some.
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GP.Style 70 GP SJ White/Blk/Blk 71 SJ 455 4 spd Blk 3X 72 J Sundance Orange/Wht/Wht |
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#3
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Definitely RPM or speed dependent. It's likely vibrating at lower shaft RPMs but you're just not detecting it in the car.
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If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#4
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Keep in mind the tremec app is a pass/fail app, and it's possible to do better. But, it still works.
There's youtube vids that can help too, pretty easy to accomplish. .
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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 |
#5
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If a driveshaft vibration is being caused by a pinion angle issue, much of the time it will present itself as a shudder typically at lower speeds between 15-30 mph and will reduce, or even completely eliminate after that. It will typically only be felt under a certain amount of load.
If the vibration increases with speed (not necessarily rpm) it's more indicative of a balance issue. You'd want to look at the shaft as well as the wheels and tires for an out of balance situation. On these cars, even with a stock type steel shaft, there's just not enough mass involved to create big vibrations from the shaft alone. If the vibration is RPM dependent where you can replicate it with the car sitting still, this indicates an out of balance situation with the engine, clutch, pressure plate, flywheel or even possibly something in the transmission.
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-Jason 1969 Pontiac Firebird |
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#6
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Can also be caused by accessory pulleys or accessories.
.
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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 |
#7
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We're pinion angles checked during install?
If not that's the first thing I'd check. It's simple and cost you nothing. Basically since this isnt a street strip application where you're looking for optimum angles at the track you'll be fine with a basic setup, which is the trans output shaft 1-3 degrees down and the rearend pinion yoke 1-3 degrees up. This works for all street vehicles. If that checks ok and you still have a vibration you can at least rest assure your vibration isn't caused by driveline angles and you have something else going on. Hope you don't have a driveshaft for your kit that came from inline shafts..... |
#8
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Except that would be engine speed related, not vehicle speed related.
K
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'63 LeMans Convertible '63 Grand Prix '65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer '74 Chevelle - original owner, 9.85 @ 136 mph besthttp://www.superchevy.com/features/s...hevy-chevelle/ My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524 "Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926 |
#9
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Quote:
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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 |
#10
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If pinon angle checks out, it could be out of balance or bent drive shaft. Found a few that were out of balance.
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#11
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The Tremec app disappeared from my phone and is no longer in the app store
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#12
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iPhone or IOS? I still have mine on IOS, and still see it in the store.
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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 |
#13
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IOS. Can you send a link or screenshot to my phone? I can’t locate it in the App Store.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#14
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I still have it on my iOS device as well.
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-Jason 1969 Pontiac Firebird |
#15
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TREMEC website shows it but error message when it transitions to App Store. And search on App Store doesn't show it. May have licensing issues.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#16
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Sorry - took me a while to find these.
I wrote these as a development engineer for inclusion in the S truck service manual. Hopefully they are self explanatory. The only thing I would add is that imbalance is a first order of shaft revolution disturbance (ie, one "kick" per rev) and u joint working angle disturbances are a second order problem (two "kicks" per rev). They are totally unrelated even though they both affect the same component. K
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'63 LeMans Convertible '63 Grand Prix '65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer '74 Chevelle - original owner, 9.85 @ 136 mph besthttp://www.superchevy.com/features/s...hevy-chevelle/ My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524 "Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926 |
#17
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.....
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'63 LeMans Convertible '63 Grand Prix '65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer '74 Chevelle - original owner, 9.85 @ 136 mph besthttp://www.superchevy.com/features/s...hevy-chevelle/ My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524 "Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926 |
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#18
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VERY NICE!!! ARCHIVED!!! THANK YOU!!!
.
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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 |
#19
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Thanks for posting!
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#20
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Thanks Keith!!
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"I know just enough to keep me here, but not enough to get me out" |
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