Torque arm mount

[Astre-mutt]

I'm still sorting through the Astre. I've only owned one other car that was modified by the previous owner. I bout this car on line so I didn't have a lot of time to find out all the modifications the previous owner made. Anyways when I was installing my new seats I notice the the Torque arm was mounted to the transmission cross member. Not the transmission. It looks like a well built piece. It's made out of rectangular tubing and is welded to angel iron at both ends that uses all 3 boltholes on the chassy. Off hand this looks to be a good system. It lets me mount an TH350 trans without the H-body tail section. My question is does any buddy see a problem with this? To me it seems better then mounting it to the tail section, which puts more pressure on the trans mount. But GM did that for a reason.

[flracer]

sounds interesting, can you post some pics?may be something we can get ideas from.i dont see any problems with it.

gm had a reason im sure. but those cars didnt have a lot of torque either yours sounds a lot stronger.

Richard

[cjbiagi]

The only thing I can see is that the torque arm controls the pinion angle. If you remove the torque arm front mount you can very easily rotate the rearend with the front of the arm. So, mounting it to the trans as GM designed automatically sets the pinion angle at whatever it was designed for. Relocating the front of the arm to a different spot will change the angle, could be an advantage or it could hurt depending on your situation. Other than that I think mounting it to the crossmember or other solid point is fine.

[heinz057]

i made a mount like that for my 2004r. works fine . its on the car for 2 years with no problems.

[Astre-mutt]

Sounds like it mite be a good system. As far as pinion angle under torque goes. Under torque the transmission and rear end would be trying to go different directions. Seams like it help prevent any binding at the torque arm bushing. If there is any. I'm embaris of all the tranny fluid. I knew I had a small leak. Looks like it's getting weirs.

[10secvega]

This is how i did mine

[Astre-mutt]

Kevin, did you make your torque arm? What transmission are you running. I've never seen a mount right at the end of the trans before.

[res0o7eb]

I thought the front mount on the Torque-Arm needed to be able to move fore and aft slightly - in addition to pivoting - to prevent binding.
The factory rubber bushing allows it, but a spherical rod end, solidly-mounted doesn't.

[GizmoN]

Front should be able to move. Picture attached shows Spohn front pivot. They recommend the upper point (the spherical rod end) be about 1" behind the lower point (through-bolt, grease fitting in the picture).

[spyder_xlch]

GizmoN, looks like your mount is sort of like a leaf spring shackle kind of deal. I'd think Kevin could re-do his like that if needed.

[stage169]

They recommend the upper point (the spherical rod end) be about 1" behind the lower point (through-bolt, grease fitting in the picture).

I was just wondering why Spohn recommends that. I did a little shade tree engineering on mine. We moved the rear up and down just to make sure the torque arm didn't move back enough to go above the mount point for the front of the torque arm. My mount is backwards to most aftermarket type. When you are taking off its going to pull on most but will push on mine. Hope that makes sense. Brian

[SunbirdMan]

Astre-mutt (Scott),

The stock torque arm bolt is slightly below the trans shaft centerline. Here's a pic, so that should give you an idea of any pinion angle change.

[Monzsta]

Gotta love that metal on metal rattle! My next iteration of this mount will be of the Spohn swing style. This is an early pic before I slotted the mount. The suspension bound up horribly.

[10secvega]

Kevin, did you make your torque arm? What transmission are you running. I've never seen a mount right at the end of the trans before.

Yes i made my torque arm and trans crossmember,i'm running a 200 4r.
The mount that is on the crossmember is slotted to allow movement.Not up and down but front to back.The pinion angle is set at the adjust a link.
This setup works and works well.Hows a 1.49 sixty foot on a 235/60/15 drag radial sound?

[Fasterthansome]

[quote="10secvega
This setup works and works well.Hows a 1.49 sixty foot on a 235/60/15 drag radial sound?



[/quote]

I was pulling 1.40-1.42's consistently on factory torque arm with a 26x8 dot tire.

I made a moly torque arm and it seems to work ok.