Tuscan : Rear End Vibration..........The search goes on.

[Jim Green]

Having had my Tuscan now for about 8 months, it's always had a rear end vibration (At 100mph + )which has been proving very had to find where the fault lies.

For the past couple of months, I've been trying to track down the cause............. Replace both drive shaft assemblies (Purchased two brand new drive shaft & CV Assemblies), replaced both rear tyres (Which needed replacing anyway), Had both rear wheels sent away and checked for any buckles/flat spots (Measured on a lathe with a dti gauge, and found to be perfect).

Last week I decided to eliminate any item that could be causing the vibration. As I was checking the suspension alignment, I noticed that one of the propshaft - Diff bolts was loose, Initially I was going to just tighten it up, but decided to remove it to clean it up first. On inspection I noticed that the shank on the bolt didn't seem long enough to go through both flanges. Then I thought I'd play it safe and take out all four and replace them. When I looked at the items advertised on Clever Trevors Web Site, It appears that the shank on the replacement bolts do look alot longer than the bolts on mine.

Obviously this could lead to vibration problems at the end of the prop shaft due to the differential - propshaft flange not being aligned 100%.

Here's hoping that this could be the problem i've been trying to resolve.

Here's the picture of the bolts I removed, and the ones Clever Trever is selling.





Any Comments Welcome, or suggestions of anything else to check.

Edited by Jim Green on Tuesday 3rd February 19:43

[mv automotive]

Jim Green said:

Having had my Tuscan now for about 8 months, it's always had a rear end vibration (At 100mph + )which has been proving very had to find where the fault lies.

For the past couple of months, I've been trying to track down the cause............. Replace both drive shaft assemblies (Purchased two brand new drive shaft & CV Assemblies), replaced both rear tyres (Which needed replacing anyway), Had both rear wheels sent away and checked for any buckles/flat spots (Measured on a lathe with a dti gauge, and found to be perfect).

Last week I decided to eliminate any item that could be causing the vibration. As I was checking the suspension alignment, I noticed that one of the propshaft - Diff bolts was loose, Initially I was going to just tighten it up, but decided to remove it to clean it up first. On inspection I noticed that the shank on the bolt didn't seem long enough to go through both flanges. Then I thought I'd play it safe and take out all four and replace them. When I looked at the items advertised on Clever Trevors Web Site, It appears that the shank on the replacement bolts do look alot longer than the bolts on mine.

Obviously this could lead to vibration problems at the end of the prop shaft due to the differential - propshaft flange not being aligned 100%.

Here's hoping that this could be the problem i've been trying to resolve.

Here's the picture of the bolts I removed, and the ones Clever Trever is selling.





Any Comments Welcome, or suggestions of anything else to check.

Edited by Jim Green on Tuesday 3rd February 19:43

have your prop balance checked whilst removed,

nice bolts by the way

[Jim Green]

Good Idea Mike,

Will look for somewhere close (Portsmouth Area).

[rev-erend]

So did you finally manage to get them all off..

[red griff roger]

I had a similar problem years ago on a Triumph GT6. It was the prop shaft that needed a balance. As he says, easy to check.

[Jim Green]

rev-erend said:

So did you finally manage to get them all off..

Arghhhh............No, See my other post

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Proving a total pain in the butt............ Who the hell put a cross member right below the propshaft fixing bolts..........Arghhh.

Edited by Jim Green on Wednesday 4th February 14:51