-
11-05-2007 06:12 AM #1
Quick response please! Harmonic balancer
My 1988 gmc 1 ton has a nasty vibration while driving down the road. It gets worse with speed. At first i thought it was the u-joints, but I replaced them and its still there. The vibration goes away when I pull the truck out of gear and let it coast. Also the vibration isn't constant but seems to be rythmatic with the engine rpms. Is it possible the balancer could be going? How do I check it? Engine only has 50000 miles on it.
-
Advertising
- Google Adsense
- REGISTERED USERS DO NOT SEE THIS AD
-
11-05-2007 06:39 AM #2
Do you have a 2 piece drive shaft?
If so, are the u joints lined up correctly? Is the center support bearing good?
Check the converter bolts
And yes the harmonic balancer can along with all these other items cause the vibration
Jerry
-
11-05-2007 02:35 PM #3
Hell, I have exactly the same problem. I have changed everything from the fan clutch to the differential and it still isn't gone. Engine is rebuilt and balanced, new balancer, flexplate is straight, converter is new and trans rebuilt, driveshaft is brand new. Vibrating as always. Next thing I'm going to buy is a new trans mount from Energy Suspension, a harder one made of poly urethane. If it turns out to have been that (or the engine mounts, which I shall also be changing), then I'm going to be really angry
Please keep me posted if you find out the source of vibrations, and I'll fill you in on any news I have.
Good luck,
MaxHarharhar...
-
11-05-2007 06:22 PM #4
I know that this might sound a little odd. But I had a 86 ford van that did the very same thing under the same conditions. If I put the tranny in neutral and coasted, there was no vibration. Under load it would about shake you out of the seat. Replaced the U-joints, carrier bearing, Balancer, belts and pullies. Still not any better. Then after driving it for a couple of weeks I needed to put new rear shoes on it and the axle bearings were wore out! I put new seals and axle bearings (and new RR axle) in the rearend and was amazed that it was the original problem. When it was under load the axle was twisting in the housing and trying to ride up the housing causing the vibration.
-
11-05-2007 06:34 PM #5
Well that sounds like an Explanation I haven't looked into yet, I know my rear axle isn't at its best anymore, I'll check that right next weekend... Thanks for the info!Harharhar...
-
11-23-2007 12:23 PM #6
Thanks guys! I've already replaced the ujoints and checked the carrier bearing while I was under there. Everything seamed good. Never thought about the axle. Truck only has 52000 mls on it but the under side is pretty rough. Who knows what the previous two owners really did with it. I'll try and check the rest out when I have time.
Welcome to Club Hot Rod! The premier site for
everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more.
- » Members from all over the US and the world!
- » Help from all over the world for your questions
- » Build logs for you and all members
- » Blogs
- » Image Gallery
- » Many thousands of members and hundreds of thousands of posts!
YES! I want to register an account for free right now! p.s.: For registered members this ad will NOT show
Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance