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#26 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 775
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Re: Pinion angle
drive shaft run out???
4:10's...that DS better be balanced dead nits and with a high RPM balancer....which few shops have Tire balance good? and rim bent or have run out? |
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#27 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,713
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Re: Pinion angle
Nope, that's why I asked how he had the driveshaft shortened. The clocking could be off or the front section-- if shortened by itself-- may not be in balance with the rear now
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#28 |
Registered User
Join Date: Sep 2020
Location: Kennewick, Wash.
Posts: 248
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Re: Pinion angle
I took the whole thing to a driveline shop. They shortened the front section and installed all new u-joints and carrier bearing. I can only assume they rebalanced it.
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#29 | |
Registered User
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,211
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Re: Pinion angle
Quote:
I ran it supported on jack stands without wheels, tires and brake drums. The vibration is still there. BTW: at 45 driveshaft speed is about 2K max. At 70 nice and smooth.
__________________
Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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#30 | |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,713
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Re: Pinion angle
Quote:
I'd be looking at tires and rims--possible alignment--shocks, bushings not seated etc. Can you get us a picture of the rear with the d-line showing |
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#31 |
Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,460
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Re: Pinion angle
I used an app off play store seems to be pretty accurate and yes take the case off phone. I double and triple checked mine even bought a digital one to check it. I am a 1 piece shaft and installed a 700r4 that sits way low on stock crossmember 7*down on tail end and rear pinion was 2* up got the rear trans at 3*down should be good to go now.
__________________
2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327/4L60 |
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#32 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 775
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Re: Pinion angle
OP
Are you sure this is a DL induced vibration?? Have you ruled out torque converter shutter? (most common at 45mph...) |
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#33 | |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Pinion angle
Quote:
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__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#34 |
Registered User
Join Date: Sep 2020
Location: Kennewick, Wash.
Posts: 248
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Re: Pinion angle
No, not positive if it's the driveshaft. The torque converter is a brand new Hughes unit.
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#35 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 775
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Re: Pinion angle
Hughes is a very good TC. what I run in other cars.
Trans fluid is a typical "shutter" problem...so assume you are running the right type. This assumes trans/TC shutter is even the issue. Just thought I would add hat to the ? list if the vibration was possibly not a DL angle issue or DS balance issue |
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#36 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,132
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Re: Pinion angle
Before changing a bunch of stuff, try re-using the previous rubber trans mount. There's been more than one complaint about vibrations after switching to Poly driveline mounts.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#37 |
Registered User
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,211
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Re: Pinion angle
to the OP, did you ever get this resolved?
__________________
Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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#38 |
Registered User
Join Date: Sep 2020
Location: Kennewick, Wash.
Posts: 248
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Re: Pinion angle
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#39 | |
Registered User
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,211
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Re: Pinion angle
Quote:
__________________
Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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#40 |
Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,460
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Re: Pinion angle
If it helps any I used 1 of them ol school mechanical dials compared to my smart phone which I compared to a store bought digital which I compared to the tremec phone app and they all read different
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__________________
2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327/4L60 |
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#41 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,051
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Re: Pinion angle
I spent a great deal of time perfecting my driveline angles. Ended up being the polyurethane transmission and engine mounts. Back to rubber now and the vibration us gone
Poly has its place..in a race car.
__________________
1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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#42 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,132
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Re: Pinion angle
I mentioned this above. Many overlook this as a possibility yet it's common. Easy enough to verify as well w/o requiring other changes & should be a 1st step IMO.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#43 |
Registered User
Join Date: Sep 2020
Location: Kennewick, Wash.
Posts: 248
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Re: Pinion angle
My engine mounts are rubber. The trans mount is poly. Maybe that's it....
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#44 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,132
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Re: Pinion angle
Anything is possible & it's easy enough to verify.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#45 | |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Pinion angle
Quote:
__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#46 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Pinion angle
I have the 72 manual. Page 4-24, the 70 manual should have the same spline phasing procedure maybe not on the same page?
__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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