driveline support beam
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
driveline support beam
hi all..
can anybody post a pic of a driveline support beam?
i don´t know, if mine is bend or not..?
can anybody give ma a sketch with detailed numbers, in inches or mm?
please, please, please...
Thank you :cheers:
can anybody post a pic of a driveline support beam?
i don´t know, if mine is bend or not..?
can anybody give ma a sketch with detailed numbers, in inches or mm?
please, please, please...
Thank you :cheers:
Melting Slicks
Joined: Aug 2001
Posts: 2,516
Likes: 0
From: Lockport NY
Re: driveline support beam (corvette90)
I don't think I quite know what you're looking for here...
Are you talking about the OEM aluminum beam that connects the trans to the diff??? Or the aftermarket reinforcement beam that is said to eliminate driveline flex/hop under acceleration???
The OEM beam shouldn't be bent or twisted, but I don't think I've ever read anything about them being damaged in any way...What measurement were you looking for???
But there are several threads here on the bolts being loose (even though nuts are tight!) and the beam making noise or even being seen to move...
... :confused: ...
Are you talking about the OEM aluminum beam that connects the trans to the diff??? Or the aftermarket reinforcement beam that is said to eliminate driveline flex/hop under acceleration???
The OEM beam shouldn't be bent or twisted, but I don't think I've ever read anything about them being damaged in any way...What measurement were you looking for???
But there are several threads here on the bolts being loose (even though nuts are tight!) and the beam making noise or even being seen to move...
... :confused: ...
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
Re: driveline support beam (Rich B.)
Hi
I´m talking about the OEM aluminium beam between tranny and diff
i know, that it should not be bended or twisted, but i think it is....i recogniced this when i was under the car today..
i,m looking about the whole sketch of the beam, so that i would be able to machine one myself-i have the possibilities
so i need the measures of the original beam..
please help me :cry
I´m talking about the OEM aluminium beam between tranny and diff
i know, that it should not be bended or twisted, but i think it is....i recogniced this when i was under the car today..
i,m looking about the whole sketch of the beam, so that i would be able to machine one myself-i have the possibilities
so i need the measures of the original beam..
please help me :cry
Le Mans Master
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: driveline support beam (corvette90)
or
Most will have some of the webbing a little bent. More modified cars may have the webbing really bent from the torque. Mine has not had a lot of miles behind the engine, but has some bending in the middle. Give me a season of slicks and I doubt it will still look like this.
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: driveline support beam (Vette92)
Give me a season of slicks and I doubt it will still look like this.
Le Mans Master
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: driveline support beam (Glock'94)
The bends that I am refering to are ...
I am pretty sure these are straight like the rest of the mesh from the factory. As for the rest of the arm, it has some curves and is not just a straight bar.
[Modified by Vette92, 3:23 PM 2/13/2002]
I am pretty sure these are straight like the rest of the mesh from the factory. As for the rest of the arm, it has some curves and is not just a straight bar.
[Modified by Vette92, 3:23 PM 2/13/2002]
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Drifting
Joined: Aug 2001
Posts: 1,606
Likes: 14
From: Vacaville, CA
Re: driveline support beam (corvette90)
Just checked mine sitting on the garage floor. It has those two subtle bends on the one side right in the middle. Looks like they were forged that way from the factory. My vette had only 40,000 babied miles before the torque arm was removed.
Drifting
Joined: Jun 1999
Posts: 1,874
Likes: 1
From: Garden Grove CA
Re: driveline support beam (corvette90)
What you will need to do is measure the angle of the trans vs the angle of the differential, there are special tools made for this job. Generally speaking you will want the difference in angle from the trans to the diff to be from 0 to just a couple of degrees negative max, what you don't want is differential angle degrees positive compared to the trans.
I've always been surprised that nobody markets a heavy duty steel C beam replacement. Mine has the same bends others here are talking about, I'll only worry about it if the car develops some untraceable vibration that might be the result of bad driveline angles.
Thomas
I've always been surprised that nobody markets a heavy duty steel C beam replacement. Mine has the same bends others here are talking about, I'll only worry about it if the car develops some untraceable vibration that might be the result of bad driveline angles.
Thomas
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: driveline support beam (The Green Rocket)
You have to have the trans output shaft parallel to the rear end input shaft. They do not have to be in a straight line, but if the angles are not parallel the two u-joints differences in angular velocity will not cancel out...which will result in drive line vibrations at certain speeds.
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
Re: driveline support beam (BBA)
ok, the thing with the angles..no problem to understand..
how does driveshaft vibrations "feel" ?
come thy from near the center console, or can the whole engine shake??
i hope yóu reply again..
you mentioned it..nobody offers a driveline support beam made of steel..
thats why i want to make one myself..
can anybody give me a sketch with numbers??
thanks..
how does driveshaft vibrations "feel" ?
come thy from near the center console, or can the whole engine shake??
i hope yóu reply again..
you mentioned it..nobody offers a driveline support beam made of steel..
thats why i want to make one myself..
can anybody give me a sketch with numbers??
thanks..
Drifting
Joined: Jun 1999
Posts: 1,874
Likes: 1
From: Garden Grove CA
Re: driveline support beam (corvette90)
No sketch or numbers coming from me, I wouldn't want to be responsible for a bad part if my C beam is not perfect. Best thing to do if you are serious about making (and possibly marketing) a heavy duty steel replacement is to go buy a brand new C beam and use it to make a jig.
BBA is correct that you are generally best off to have them parallel. The only reason to have one or two degrees negative is for a higher powered car, because under hard acceleration the differential will litterally rotate backwards ever so slightly. So with one or two negative this puts it parallel under acceleration.
Thomas
[Modified by The Green Rocket, 8:18 PM 2/14/2002]
BBA is correct that you are generally best off to have them parallel. The only reason to have one or two degrees negative is for a higher powered car, because under hard acceleration the differential will litterally rotate backwards ever so slightly. So with one or two negative this puts it parallel under acceleration.
Thomas
[Modified by The Green Rocket, 8:18 PM 2/14/2002]
Melting Slicks
Joined: Apr 2001
Posts: 2,105
Likes: 220
From: Ca.
Re: driveline support beam (chucks88)
All the ones I have seen have those little bends in them.
Not the one I am staring at
Not the one I am staring at
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: driveline support beam (BBA)
On my 79, it was smooth riding up to about 110 MPH...then it shook a little, all was smooth again at 120 MPH, all the way up to over 160.
I put in new differential bushings and set the angles on the pinion with shims...vibration went away.
My 87 has not problem with vibrations...and I lined those up by sight as well.
I put in new differential bushings and set the angles on the pinion with shims...vibration went away.
My 87 has not problem with vibrations...and I lined those up by sight as well.
