Vibration in drive line ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RShaips · 03-31-2005, 03:40 PM

I have a 67 SWB that is sitting on a 71 frame. This truck was a total restoration. I am having some vibration that I can feel as I drive it, the faster I go the worse it gets. It has a new driveshaft, that has been balanced and a 700R4 Tranny. It feels like its in my driveline somewhere, I ran it off the ground and everything looks ok. how can I tell if I have a bent axle? Wheels are spinning decent and wheel bearings feel tight. I just put this tranny in, could it be causing this? I don't think its the problem, just can't narrow it down to location, feel it in the seat, mirror vibrates, not in the front end at all. Its a tight fast vibration. Help !

70c10 · 03-31-2005, 03:54 PM

Re-Check the u-joints or drive shaft itself.

67ChevyRedneck · 03-31-2005, 04:01 PM

Was the tranny mount a bolt in or did you have to drill holes to mount it. Also, did you use stock motor mount holes? Could be possible your out of line somewhere, but I'd check the u-joints, then driveshaft, and go from there.

Low69CST · 03-31-2005, 04:04 PM

did you put in a one piece driveshaft or 2 piece? Could be a midshaft bearing.

RShaips · 03-31-2005, 04:22 PM

I put the tranny in, its a new one piece driveshaft, U joints are new and tight. I did have to drill holes to move the crossmember back and put a new rubber mount on.

shifty · 03-31-2005, 04:23 PM

Driveshaft alignment? Is it possible the angle is out of whack? Do these trucks have problems when lowered or raised where the driveline needs pinion shims?

RShaips · 03-31-2005, 04:42 PM

I don't know ,but my truck has a 2/4 drop with springs.

CHEVIBUBBA · 03-31-2005, 05:00 PM

if you lower or raise your truck, you need to check/correct the pinion angle.
good reading:
http://www.drivetrain.com/driveline_angle_problem.html
http://www.iedls.com/ptsetup.html
http://buickperformance.com/Pinion.htm
http://www.2quicknovas.com/happypinions.html
http://www.carcraft.com/howto/91758/

67ChevyRedneck · 03-31-2005, 04:51 PM

That could be it. The driveline angle should not exceed 3 degrees. The angle could have caused the u-joints to go bad. jmo

*screamin_c102* · 03-31-2005, 04:51 PM

First, is the vibration at speed? Or at engine speed? Take the truck up to 65 and put it in neutral, then see if you can feel the vibration, if you can then its more than likely in your driveline and or axle and hubs.
If you cant feel the vibration drop the truck back into drive, not OD but D and see if you can feel it now. If you can then it is probably something to do with the new tranny, as I believe you did not change the motor out I would rule it out right away. Did you change out your torque convertor? and if so are you sure it is completelt seated against the flexplate?

I had a B&M torque convertor that would not center into my crank just because of the paint buildup on the convertor, caused a wicked vibration at engine speed.

Just my $.02

RShaips · 03-31-2005, 05:11 PM

Wow, Lots of info there ! I guess that could be it, it feels like a high frequency vibration. I am pretty sure it does still vibrate when its in neutral, have to check again. It feels exzactly like my ujoints are loose. Don't ask me how I know how this feels ! LOL

curbyk · 03-31-2005, 05:25 PM

Don't know if this would cause a vibration but did you have the drive shaft made before or after you lowered the truck and is there any or enough movement (in and out) of the yoak at the transmission?

RShaips · 03-31-2005, 05:46 PM

I had the driveshaft made after I lowered the truck and there is plenty of room for movement where it slips over the splines on the tranny. I did not bring my truck in I just measured the distance and had one made.

RShaips · 03-31-2005, 11:43 PM

If my axle was bent would I be able to see the wheel move out of round as it was running ?

CHEVIBUBBA · 04-01-2005, 12:57 AM

depends on how bad/where it's bent.shgould see unusual wear pattern on tire/tires.
best to pull it & check on a v-block set.

chevybill · 04-01-2005, 10:51 AM

I have a 70 c 10 with 2.5 drop spindles with stock height springs in front and I have 3 inch lowering springs for the rear ( yet to be installed with my rebuilt rearent with my eaton posi unit).

I am using the factory spring mounts and factory trailing arm mounts.

Should I be concerned about a change in the pinion angle? I plan on using my factory 3 speed manual and factory driveshaft (after checking and rebalancing).

Am I ok since I have lowered the truck almost the same amount front and back? Truck is a lwb if that makes a difference.

Thanks guys.

chevybill · 04-02-2005, 02:42 AM

ttt

purple gas · 04-02-2005, 12:27 PM

First thing I'd do is check all your tires for ballance and alignment. It's easy & cheap to do. It'd be a B*tch to do a bunch of drive line work and then find out you just have a a wheel weight out of whack.

Big Block · 04-02-2005, 12:37 PM

I had 71 GMC short bed fleetside. Had the same problem. I did a engine & trans swap and still had vibration. Had the drive shaft balanced. Still had vibration. It ended up being a rear axle bearing. B.B.

1-PU70 · 04-02-2005, 02:40 PM

Try rephasing the drive shaft. Unbolt it from the rear end and turn it 180 dg and then bolt it back up. Helps a lot of times.

RShaips · 04-03-2005, 06:42 PM

Thanks for the replies, I have been out of town fishing the last few days so I have not had a chance to try anything. I get to it this week.

03-31-2005, 03:40 PM	#1
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	Vibration in drive line ? I have a 67 SWB that is sitting on a 71 frame. This truck was a total restoration. I am having some vibration that I can feel as I drive it, the faster I go the worse it gets. It has a new driveshaft, that has been balanced and a 700R4 Tranny. It feels like its in my driveline somewhere, I ran it off the ground and everything looks ok. how can I tell if I have a bent axle? Wheels are spinning decent and wheel bearings feel tight. I just put this tranny in, could it be causing this? I don't think its the problem, just can't narrow it down to location, feel it in the seat, mirror vibrates, not in the front end at all. Its a tight fast vibration. Help !

03-31-2005, 03:54 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re-Check the u-joints or drive shaft itself. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 03-31-2005 at 03:58 PM.

03-31-2005, 04:01 PM	#3
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Was the tranny mount a bolt in or did you have to drill holes to mount it. Also, did you use stock motor mount holes? Could be possible your out of line somewhere, but I'd check the u-joints, then driveshaft, and go from there. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

03-31-2005, 04:04 PM	#4
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	did you put in a one piece driveshaft or 2 piece? Could be a midshaft bearing. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

03-31-2005, 04:23 PM	#6
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	Driveshaft alignment? Is it possible the angle is out of whack? Do these trucks have problems when lowered or raised where the driveline needs pinion shims? __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

03-31-2005, 04:22 PM	#5
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	I put the tranny in, its a new one piece driveshaft, U joints are new and tight. I did have to drill holes to move the crossmember back and put a new rubber mount on.

03-31-2005, 04:42 PM	#7
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	I don't know ,but my truck has a 2/4 drop with springs.

03-31-2005, 05:00 PM	#8
CHEVIBUBBA got boost? Join Date: Mar 2005 Posts: 123	if you lower or raise your truck, you need to check/correct the pinion angle. good reading: http://www.drivetrain.com/driveline_angle_problem.html http://www.iedls.com/ptsetup.html http://buickperformance.com/Pinion.htm http://www.2quicknovas.com/happypinions.html http://www.carcraft.com/howto/91758/ __________________ '70 chevy lwb w/'67 hood. 357 s.b.c. built, 4l60 w/vigilante lockup high stall converter, edelbrock pro-flo,brodix heads,comp cams rollerized w/ belt drive, one piece d-shaft, yada, yada, yada..... '82 honda v45 sabre"the black"

03-31-2005, 04:51 PM	#9
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	That could be it. The driveline angle should not exceed 3 degrees. The angle could have caused the u-joints to go bad. jmo __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

03-31-2005, 04:51 PM	#10
screamin_c102 Account Suspended Join Date: Feb 2005 Location: Yoncalla Oregon Posts: 775	First, is the vibration at speed? Or at engine speed? Take the truck up to 65 and put it in neutral, then see if you can feel the vibration, if you can then its more than likely in your driveline and or axle and hubs. If you cant feel the vibration drop the truck back into drive, not OD but D and see if you can feel it now. If you can then it is probably something to do with the new tranny, as I believe you did not change the motor out I would rule it out right away. Did you change out your torque convertor? and if so are you sure it is completelt seated against the flexplate? I had a B&M torque convertor that would not center into my crank just because of the paint buildup on the convertor, caused a wicked vibration at engine speed. Just my $.02

03-31-2005, 05:11 PM	#11
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	Wow, Lots of info there ! I guess that could be it, it feels like a high frequency vibration. I am pretty sure it does still vibrate when its in neutral, have to check again. It feels exzactly like my ujoints are loose. Don't ask me how I know how this feels ! LOL

03-31-2005, 05:25 PM	#12
curbyk 69 C-10 project Join Date: Sep 2004 Location: Eastern, NC Posts: 184	Don't know if this would cause a vibration but did you have the drive shaft made before or after you lowered the truck and is there any or enough movement (in and out) of the yoak at the transmission? __________________ 69 C-10 Work is complete

03-31-2005, 05:46 PM	#13
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	I had the driveshaft made after I lowered the truck and there is plenty of room for movement where it slips over the splines on the tranny. I did not bring my truck in I just measured the distance and had one made.

03-31-2005, 11:43 PM	#14
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	If my axle was bent would I be able to see the wheel move out of round as it was running ?

04-01-2005, 12:57 AM	#15
CHEVIBUBBA got boost? Join Date: Mar 2005 Posts: 123	depends on how bad/where it's bent.shgould see unusual wear pattern on tire/tires. best to pull it & check on a v-block set. __________________ '70 chevy lwb w/'67 hood. 357 s.b.c. built, 4l60 w/vigilante lockup high stall converter, edelbrock pro-flo,brodix heads,comp cams rollerized w/ belt drive, one piece d-shaft, yada, yada, yada..... '82 honda v45 sabre"the black"



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04-01-2005, 10:51 AM	#16
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	I have a question.. I have a 70 c 10 with 2.5 drop spindles with stock height springs in front and I have 3 inch lowering springs for the rear ( yet to be installed with my rebuilt rearent with my eaton posi unit). I am using the factory spring mounts and factory trailing arm mounts. Should I be concerned about a change in the pinion angle? I plan on using my factory 3 speed manual and factory driveshaft (after checking and rebalancing). Am I ok since I have lowered the truck almost the same amount front and back? Truck is a lwb if that makes a difference. Thanks guys. __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

04-02-2005, 02:42 AM	#17
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	ttt __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

04-02-2005, 12:27 PM	#18
purple gas Registered User Join Date: Oct 2004 Location: saskatoon, planet earth Posts: 694	First thing I'd do is check all your tires for ballance and alignment. It's easy & cheap to do. It'd be a B*tch to do a bunch of drive line work and then find out you just have a a wheel weight out of whack. __________________ I got a bench seat baby, you don't have to sit over there.

04-02-2005, 12:37 PM	#19
Big Block Big Block Join Date: Mar 2005 Location: Durham, N.C. Posts: 1,649	I had 71 GMC short bed fleetside. Had the same problem. I did a engine & trans swap and still had vibration. Had the drive shaft balanced. Still had vibration. It ended up being a rear axle bearing. B.B.

04-02-2005, 02:40 PM	#20
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Try rephasing the drive shaft. Unbolt it from the rear end and turn it 180 dg and then bolt it back up. Helps a lot of times. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

04-03-2005, 06:42 PM	#21
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	Thanks for the replies, I have been out of town fishing the last few days so I have not had a chance to try anything. I get to it this week.

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