oscillation vibration? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

swamp rat · 10-27-2007, 11:53 PM

I used to own a 76 Chev 4X4, it was full time when I bought it, I installed the conversion kit and put locking hubs on it.

This truck had this oscillation vibration at certian speeds, I think it was it was only in a 5 MPH range around 60mph, anything above and it would stop, anything below and it wouldn't do it ether. it did it before and after my mod.

The vibraton was kinda like 4 seconds on and 4 seconds off, just a steady rhythm intil I changed my speed.

I know what a tire feels like, its a steady vibration at certian speeds, so I allways figured it was in the drive train somwhere but never figured it out.

Anybody experiance this and know what causes it??

Blue_71 · 10-28-2007, 01:35 AM

im gonna watch this one closely!! ive got the same thing in my 89 from 30-35, mines a little faster but it is the oddest vibration ive ever felt.... and im a GM dealer/ASE certified mechanic!! im starting to think driveshaft in mine

68K20 x Drill · 10-28-2007, 03:06 AM

Worn rear axle?

Chris27 · 10-28-2007, 10:43 AM

My father in-law's 94 Blazer did the same thing. Apparently it was something in the transmission, once the tranny got replaced it stopped doing that. I have no idea what in the tranny caused it. If you get out of the throttle and back on again, does it stop? That's what his did.

68K20 x Drill · 10-28-2007, 05:26 PM

Come to think of it, I've fixed that by tightening an output yoke nut....

10-27-2007, 11:53 PM	#1
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	oscillation vibration? I used to own a 76 Chev 4X4, it was full time when I bought it, I installed the conversion kit and put locking hubs on it. This truck had this oscillation vibration at certian speeds, I think it was it was only in a 5 MPH range around 60mph, anything above and it would stop, anything below and it wouldn't do it ether. it did it before and after my mod. The vibraton was kinda like 4 seconds on and 4 seconds off, just a steady rhythm intil I changed my speed. I know what a tire feels like, its a steady vibration at certian speeds, so I allways figured it was in the drive train somwhere but never figured it out. Anybody experiance this and know what causes it?? __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

10-28-2007, 03:06 AM	#3
68K20 x Drill Registered User Join Date: Apr 2007 Location: Freedom CA Posts: 488	Re: oscillation vibration? Worn rear axle? __________________ 68 Chevrolet k20 Longbed 350 SM465/205, Dana 44, 14bolt, Power steering, Power Disk Brakes, 35" BFGs. 84 Chevrolet Suburban K20 6.2 Banks turbo TH400/NP208 Now with G80 68 GMC C20 Parts? Truck And a few cars

10-28-2007, 10:43 AM	#4
Chris27 Blazerless Join Date: Nov 2006 Location: Kelowna, BC, Canada Posts: 274	Re: oscillation vibration? My father in-law's 94 Blazer did the same thing. Apparently it was something in the transmission, once the tranny got replaced it stopped doing that. I have no idea what in the tranny caused it. If you get out of the throttle and back on again, does it stop? That's what his did. __________________ 72' K5 Blazer 4x4 350TBI/700R4/NP205 3/4 ton diffs. Daily driver. SOLD 69' Beaumont 388/700R4 11.70@116 77' Bronco, Wife's mall cruiser/poser 4x4. Capable but too pretty to go offroad.

10-28-2007, 05:26 PM	#5
68K20 x Drill Registered User Join Date: Apr 2007 Location: Freedom CA Posts: 488	Re: oscillation vibration? Come to think of it, I've fixed that by tightening an output yoke nut.... __________________ 68 Chevrolet k20 Longbed 350 SM465/205, Dana 44, 14bolt, Power steering, Power Disk Brakes, 35" BFGs. 84 Chevrolet Suburban K20 6.2 Banks turbo TH400/NP208 Now with G80 68 GMC C20 Parts? Truck And a few cars



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.