vibration from 15-20 miles per hour

manuk · 10-07-2008, 06:07 PM

hey guys i've got this vibration coming from somewhere in my drivetrain, i just cant put a finger on it. it's only between the range of 15-20mph, and it happens both when i speed up and slow down right through that range. it's really bad when my truck's cold but never the less it still occurs when it's warm. as i speed up through first, i shift to second and as i release the clutch my whole truck damn near vibrates. also, the vibration seems to travel from the passenger side rear to right below the cab as the truck slows down and it fades away. ive got 2 new u joints in the rear, with a balanced d-shaft. any answers?

fillsrunner4 · 10-07-2008, 06:12 PM

check alignment, tires balanced, Wheel bearings maybe, steering loose?. Theres alot it could be but those are a couple to check! My buddy is having a similar issue with his 83 SFA in his 94 pickup. His is more of a death wobble though not just vibration

Post up the specs of your rig too!

fillsrunner4 · 10-07-2008, 06:13 PM

The vibration could also maybe be the main bearing in the tranny going! That would easily cause a vibration in the drivetrain

pepsibluefloat · 10-07-2008, 06:56 PM

could be shocks too if you're getting some wheel hop

manuk · 10-08-2008, 02:40 PM

tires are balanced, not sure about the alignment. ya the steerings loose too but i just figured, hey its an old truck i didnt expect it to respond like a corvette. i wouldnt call mine a death wobble though (yet), but definetly a strong vibration. any way in particular to check the main bearing in the tranny?

904_runner · 10-08-2008, 02:57 PM

how are the fluids in the diff/tranny?

chuck308 · 10-09-2008, 06:57 AM

push the clutch when the vibration starts and see what happens, if it vibrates at 15 -20 when it is just rolling(no load on motor) or clutch you may be able to isolate.

manuk · 10-09-2008, 10:56 AM

chuck,
i have done that. the vibration is there even with no load on the motor. only thing is, as i release the clutch it vibrates also. but to answer your question, yes the vibration is there at 15-20mph regardless of whether or not im in gear.

chuck308 · 10-10-2008, 07:39 PM

that rules out parts of the drive train. Your vibration is a constant velocity component, drive shaft, front axel, wheel bearing, rear end etc. Keep searching, we'll keep ponderin'

manuk · 10-10-2008, 08:29 PM

how do i know it is or isnt the tranny main bearing?

4Crawler · 10-10-2008, 08:46 PM

One thing to try if so inclined is to pull the rear drive shaft and test drive in front wheel drive (lock the front hubs and use 4H). If the vibrations go away, it is likely the rear shaft, if not, then you have eliminated the rear shaft. One thing to check on the rear shaft is the phasing of the u-joints:
- http://www.4crawler.com/4x4/CheapTri....shtml#Phasing

10-07-2008, 06:07 PM	#1 (permalink)
manuk Registered User Join Date: Jun 2007 Location: san diego, ca Posts: 22	vibration from 15-20 miles per hour hey guys i've got this vibration coming from somewhere in my drivetrain, i just cant put a finger on it. it's only between the range of 15-20mph, and it happens both when i speed up and slow down right through that range. it's really bad when my truck's cold but never the less it still occurs when it's warm. as i speed up through first, i shift to second and as i release the clutch my whole truck damn near vibrates. also, the vibration seems to travel from the passenger side rear to right below the cab as the truck slows down and it fades away. ive got 2 new u joints in the rear, with a balanced d-shaft. any answers?

10-07-2008, 06:12 PM	#2 (permalink)
fillsrunner4 Registered User Join Date: Jun 2004 Location: Sammamish, wa Posts: 2,363	check alignment, tires balanced, Wheel bearings maybe, steering loose?. Theres alot it could be but those are a couple to check! My buddy is having a similar issue with his 83 SFA in his 94 pickup. His is more of a death wobble though not just vibration Post up the specs of your rig too! __________________ 94' toyota 4runner (Many a change!) purchased bone stock, NOW... SAS, 37x14" Iroks, Rear Leafs, 5.29's , Air locked front, Welded rear, 4.3L, Chevy V6 , 5spd swapped, dual T/C's MC10R10, flatbelly with custom skids, sliders, and so much more. Might as well start reading this if ya want know more Fillsrunner4 3.4crawler Build Thread Fillsrunner4.3 crawler (Part Two) build thread

10-07-2008, 06:13 PM	#3 (permalink)
fillsrunner4 Registered User Join Date: Jun 2004 Location: Sammamish, wa Posts: 2,363	The vibration could also maybe be the main bearing in the tranny going! That would easily cause a vibration in the drivetrain __________________ 94' toyota 4runner (Many a change!) purchased bone stock, NOW... SAS, 37x14" Iroks, Rear Leafs, 5.29's , Air locked front, Welded rear, 4.3L, Chevy V6 , 5spd swapped, dual T/C's MC10R10, flatbelly with custom skids, sliders, and so much more. Might as well start reading this if ya want know more Fillsrunner4 3.4crawler Build Thread Fillsrunner4.3 crawler (Part Two) build thread

10-07-2008, 06:56 PM	#4 (permalink)
pepsibluefloat Registered User Join Date: Dec 2006 Location: Albuquerque, New Mexico Posts: 333	could be shocks too if you're getting some wheel hop __________________ 1988 4runner::SAS\|3vze\|A340H\|5.29's\|Aussie Front\|LockRight Rear\|Longfield axles/Hub Gear\|4"Rear/3"Front springs\|Marlin High Steer\|Custom CV rear driveshaft from High Angle Driveline\|Rear D/S shortened and made into front D/S \|35" Goodyear MT/R My 4runner n stuff

10-10-2008, 08:46 PM	#11 (permalink)
4Crawler Contributing Member Join Date: Jun 2002 Location: SF Bay Area, CA Posts: 6,265	One thing to try if so inclined is to pull the rear drive shaft and test drive in front wheel drive (lock the front hubs and use 4H). If the vibrations go away, it is likely the rear shaft, if not, then you have eliminated the rear shaft. One thing to check on the rear shaft is the phasing of the u-joints: - http://www.4crawler.com/4x4/CheapTri....shtml#Phasing __________________ 1985 Toyota 4Runner SR-5, 22REC engine, dual t-cases, 4.88 gears, dual ARBs, 33x10.50 BFGs. r.c.brown@ieee.org TruckEditor@tlca.org Project: 4Crawler 4Crawler OffRoad Gettin'Off 4WD Club

10-08-2008, 02:40 PM	#5 (permalink)
manuk Registered User Join Date: Jun 2007 Location: san diego, ca Posts: 22	tires are balanced, not sure about the alignment. ya the steerings loose too but i just figured, hey its an old truck i didnt expect it to respond like a corvette. i wouldnt call mine a death wobble though (yet), but definetly a strong vibration. any way in particular to check the main bearing in the tranny?

10-09-2008, 06:57 AM	#7 (permalink)
chuck308 Registered User Join Date: Oct 2008 Location: athens ga Posts: 7	push the clutch when the vibration starts and see what happens, if it vibrates at 15 -20 when it is just rolling(no load on motor) or clutch you may be able to isolate.

10-09-2008, 10:56 AM	#8 (permalink)
manuk Registered User Join Date: Jun 2007 Location: san diego, ca Posts: 22	chuck, i have done that. the vibration is there even with no load on the motor. only thing is, as i release the clutch it vibrates also. but to answer your question, yes the vibration is there at 15-20mph regardless of whether or not im in gear.

10-10-2008, 07:39 PM	#9 (permalink)
chuck308 Registered User Join Date: Oct 2008 Location: athens ga Posts: 7	that rules out parts of the drive train. Your vibration is a constant velocity component, drive shaft, front axel, wheel bearing, rear end etc. Keep searching, we'll keep ponderin'

10-10-2008, 08:29 PM	#10 (permalink)
manuk Registered User Join Date: Jun 2007 Location: san diego, ca Posts: 22	how do i know it is or isnt the tranny main bearing?

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