vibrations through all rpms range...
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,715
Likes: 25
From: Sorrento Italy
vibrations through all rpms range...
i'm just coming back from a cruise on the motorway...on a hard acceleration fm 3rd to 4th at about 5.000 rpms i've noticed an unusual and pretty hard vibration, you can notice it mainly at the trans shifter, it reduces going at lower rpms but does not disappear completely...also, on a standstill rush i've noticed (going back home) some 'movement' right in the centre of the undercarriage...like if there was something loose (driveshaft or trans).
the car has a 570hp (530tq) engine and an uprated rear end (diff/4.11 gears/3.5'' half shafts/HD TA) built by van steel with many tom's items...driveshaft is stock (2.5'') and trans is a loyal and fearless t-10 4 speeds...
i'm afraid there is something out of place down there, where should i start looking?
thanks/Giu
the car has a 570hp (530tq) engine and an uprated rear end (diff/4.11 gears/3.5'' half shafts/HD TA) built by van steel with many tom's items...driveshaft is stock (2.5'') and trans is a loyal and fearless t-10 4 speeds...
i'm afraid there is something out of place down there, where should i start looking?
thanks/Giu
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Originally Posted by panic
i'm just coming back from a cruise on the motorway...on a hard acceleration fm 3rd to 4th at about 5.000 rpms i've noticed an unusual and pretty hard vibration, you can notice it mainly at the trans shifter, it reduces going at lower rpms but does not disappear completely...also, on a standstill rush i've noticed (going back home) some 'movement' right in the centre of the undercarriage...like if there was something loose (driveshaft or trans).
the car has a 570hp (530tq) engine and an uprated rear end (diff/4.11 gears/3.5'' half shafts/HD TA) built by van steel with many tom's items...driveshaft is stock (2.5'') and trans is a loyal and fearless t-10 4 speeds...
i'm afraid there is something out of place down there, where should i start looking?
thanks/Giu
the car has a 570hp (530tq) engine and an uprated rear end (diff/4.11 gears/3.5'' half shafts/HD TA) built by van steel with many tom's items...driveshaft is stock (2.5'') and trans is a loyal and fearless t-10 4 speeds...
i'm afraid there is something out of place down there, where should i start looking?
thanks/Giu
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,715
Likes: 25
From: Sorrento Italy
Originally Posted by pws69
Did you get that driveshaft rebalanced for the new setup? If not, find a good driveline shop and do that first.
but it's about a month i'm driving with no problem nor vibration whatsoever...this new iussue just started 2 hours ago.
Burning Brakes
Joined: Oct 2004
Posts: 920
Likes: 1
From: Shelby Township Michigan
To resolve this issue with my brother's '76, he had to replace the rear hub bearings that were bad on one side and going bad on the other. This was done after the U-joints were replaced.
Good luck,
Dino
Good luck,
Dino
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Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,715
Likes: 25
From: Sorrento Italy
Originally Posted by wfo76
a worn crankshaft pilot bushing can also cause this.
it's something coming fm the trans or driveshaft, definitely
Safety Car
Joined: Apr 2004
Posts: 3,997
Likes: 1
From: WAY DEEP INSIDE AMERICO,YES YOU LIVE HERE TO!! TX
Originally Posted by pws69
Did you get that driveshaft rebalanced for the new setup? If not, find a good driveline shop and do that first.
double check it. I seen people pay out the rear to shopsto find a vibe, 99% of the time the driveshaft went bad.
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Originally Posted by panic
no, i didnt...
but it's about a month i'm driving with no problem nor vibration whatsoever...this new iussue just started 2 hours ago.
but it's about a month i'm driving with no problem nor vibration whatsoever...this new iussue just started 2 hours ago.
Burning Brakes
Joined: Nov 2004
Posts: 899
Likes: 1
From: Kansas
You said you can feel it at a stop ,in netrual or running down the road,check trans mount,
I had a bad pilot bushing or someone installed the wrong one and you could feel it at high rpms only,but yes check driveshaft u-joints,trans mount,motor mounts and rear end first before diving in the clutch pilot bushing.
I had a bad pilot bushing or someone installed the wrong one and you could feel it at high rpms only,but yes check driveshaft u-joints,trans mount,motor mounts and rear end first before diving in the clutch pilot bushing.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Originally Posted by panic
i'm just coming back from a cruise on the motorway...on a hard acceleration fm 3rd to 4th at about 5.000 rpms i've noticed an unusual and pretty hard vibration, you can notice it mainly at the trans shifter, it reduces going at lower rpms but does not disappear completely...also, on a standstill rush i've noticed (going back home) some 'movement' right in the centre of the undercarriage...like if there was something loose (driveshaft or trans).
the car has a 570hp (530tq) engine and an uprated rear end (diff/4.11 gears/3.5'' half shafts/HD TA) built by van steel with many tom's items...driveshaft is stock (2.5'') and trans is a loyal and fearless t-10 4 speeds...
i'm afraid there is something out of place down there, where should i start looking?
thanks/Giu
the car has a 570hp (530tq) engine and an uprated rear end (diff/4.11 gears/3.5'' half shafts/HD TA) built by van steel with many tom's items...driveshaft is stock (2.5'') and trans is a loyal and fearless t-10 4 speeds...
i'm afraid there is something out of place down there, where should i start looking?
thanks/Giu
If it was me I would start by checking motor mounts, tranny mounts, diff mount, and u-joints.
But if it isn't those I would bet its the T-10 trans input shaft bearing. The BW T-10 is rated for about 375 ft lbs of torque. The ratings are for that amount of torque continuous for 24 hrs. A fourth gear upshift is going to a 1 to 1 ratio. All of the torque is loaded directly onto the input shaft bearing. None to the cluster. A 5000 rpm powershift to fourth gear puts an instant, terrific shock load on that bearing. The tire slip that cushions the shock does not happen as easily in the higher gears so the instant driveline shock is greater. The weak link always breaks. I know you like 4 speeds not the 5 speed so check into an Autogear Super M-22 Rockcrusher. Direct bolt in. It will take whatever you throw at it. I can connect you with a good supplier if you need one.
Last edited by 63mako; Nov 1, 2006 at 08:19 PM.