vibrationRobert Sharrock (Dapto, NSW)

Vehicle Owned: 1997 100 Series 1HZ

I have lived in several places around NSW & QLD, I have driven 4WDs at work and in underground mines, but never got serious until about 5 years ago. I bought this ‘Cruiser, with the 1HZ diesel and an aftermarket turbo. SO far I have fitted a snorkel, cargo barrier, roof cage, 2in lift, Poly-air bags, 33in tyres, ARB Sahara bar with an Ironman winch, diesel gas, single rear tyre carrier. I’ve also built a set of rear drawers to suit my requirements.

Since I got new tyres and the 2in lift, my car has developed a driveline vibration. I had the tyres rebalanced and I have checked the uni joints. They are not new but seem okay. I don’t want to have to change them at the moment if they are not the cause. I don’t know if the front uni angle is too steep and causing the front driveshaft to run out of balance.

I am slowly overhauling things bit by bit, as I want to have the truck up to scratch for my trip to South Oz. Do you have any advice for me?

read Allan's reply and comment on the blog here


vibrationRobert Sharrock (Dapto, NSW)

Vehicle Owned: 1997 100 Series 1HZ

I have lived in several places around NSW & QLD, I have driven 4WDs at work and in underground mines, but never got serious until about 5 years ago. I bought this ‘Cruiser, with the 1HZ diesel and an aftermarket turbo. SO far I have fitted a snorkel, cargo barrier, roof cage, 2in lift, Poly-air bags, 33in tyres, ARB Sahara bar with an Ironman winch, diesel gas, single rear tyre carrier. I’ve also built a set of rear drawers to suit my requirements.

Since I got new tyres and the 2in lift, my car has developed a driveline vibration. I had the tyres rebalanced and I have checked the uni joints. They are not new but seem okay. I don’t want to have to change them at the moment if they are not the cause. I don’t know if the front uni angle is too steep and causing the front driveshaft to run out of balance.

I am slowly overhauling things bit by bit, as I want to have the truck up to scratch for my trip to South Oz. Do you have any advice for me?

Allan

G’day Robert, what I’d do is jack up the car off the ground and see if you still have the vibration when stationary. Make sure you have your mate in the cabin just in case something happens you can control the situation a bit better.

Remove the front tailshaft and see if there’s evidence of knuckling, which is what happens when the unis are asked to exceed their angle of drive. There’ll often be a witness mark just on the inside of the tailshaft uni. It can often be fixed with a little work with a die grinder. It sounds like you’ve got your finger on the problem though, and the unis are simply on too steep an angle. You may have to install a double-cardan joint to reduce the shaft’s angle of operation.

I’d be inclined to get the shaft checked and balanced at a dedicated tailshaft shop too. A rule of thumb is that if there’s a vibration in the tailshaft, it will get worse as the vehicle’s speed increases. Check those things we talked about and I reckon you’ll find your problem. Thanks mate, good luck with it.