Spohn TA and BMR Brace....

heres the problem the Spohn TA is not working 100% at its best. The TA is too far forward and i can not get the Oval piece were the TA and the brace connect. The oval is pushed forward were it needs to be up and down.

So since the Spohn TA brace is bolted onto the frame it can not be moved, now the BMR Trac Pack you weld the brace into the subframes connectors.


My question is i can buy the BMR brace, do you think it would work if i keep the Spohn TA and use the BMR brace, so i can move the position of the mounting point up and correct the problem

HAS ANYONE TRIED THIS OR DO THEY KNOW IF IT WILL WORK

does anyone have a suggestion

please, i need to know if i will be wasting my money

I'm really not to sure what you are even talking about. Why is your Spohn TA too far forward? Do you have it connected to something other than the standard mounting point? Is the "oval" the metal plate on either side that connects the TA spherical rod end to the upper mount "end" (either poly or spherical)? What "frame" is your Spohn TA bolted to?

I suspect the reason you aren't getting any answers is because the problem is not real clear.

I have a picture of the piece. But yes the oval piece I talk of is the two poly bushings. One bushing is the crossmember and the other is to the torque arm itself. The two oval pieces go on either side of the poly bushings. The crossmember stays in place and the oval pieces allow the TA to slightly move forwards and backwards to adjust for the pinion angle of choice. Now my pinion angle is set for -2 and that has the TA so far forward that the oval piece is leaning forward, which when I tap the gas or let off the TA pulls downward and bangs against the crossmember. To eliminate that I need the oval pieces to be up and down, so the front of the TA has no play in it.

All the screws in the TA are adjusted to its fullest to get the TA pushed back to bring the oval to a more up and down position, but its still bad, so I got adjustable lower control arms to push my rear-end back an inch, which got the banging noise out but still have the oval pushing forward, not as bad, but......

So I want to get the BMR crossmember which welds to the left/right subframe connectors, and I can move the position of the poly bushing mount on the crossmember forwards or backwards, so I can get the oval pieces to be up and down wards. If someone can host a pic for me I can post the pic of the oval pieces after I pushed the rear-end back an inch.

After talking to Spohn they suggested the adjustable control arms, which helped but all they could offer was that the mounting point to my Moser 9" was welded in a slightly different position, pushing the mounting point for the TA slightly forward and fudging up the whole thing. The TA brace has bent up the brackets on the car were the Spohn brace connects to.

Now both BMR and Spohn say there poly bushings are the same size, and I would get the new oval pieces from BMR with the new crossmember, so I questioned would the two fit together to get the optimal position of the oval piece so the TA works at its best?

I would call Steve Spohn and explain it to him...I have a Spohn tunnel brace mounted TA and I am having a hard time picturing what the problem is. Steve sets these things up on a jig at his shop for about 2 deg neg pinion angle out of the box...Sorry if I'm no help, but Steve should have an idea what you are talking about...ooops...Just noticed that you talked to them already...How about some pictures...?...
--Alan

OK... you have a 9-inch rear, and it appears the mounting bracket tubes are to long. Have you checked with Moser? It would seem to make more sense to simply correct the cause of the problem at the back end of the TA, rather than try and create a new mount in the front using another manufacturer's part.

If I read this correctly, your TA was so far forward that even moving the axle back 1" with the adjustable LCA's didn't cure the problem. In effect, it would appear the Moser bracket mount tubes are more than 1" too long, or the Spohn TA is more than 1" too long. You need to figure out which one.

I'm assuming when you say "All the screws in the TA are adjusted to its fullest to get the TA pushed back" that you have screwed the end that holds the poly bushing all the way into the TA tube, and you have both the rear swivel eyes screwed all the way into the tube.

If that's the case, I'd figure out what dimension is incorrect, and fix the problem, not possibly create a new one. How did moving the axle assembly back a full 1" afect the engagement of the tranny output shaft/DS yoke splines? Sounds like you must have the splined tube at least 1.5" out of the tranny output shaft by now, and if that's the case, you are going to twist the splines and really mess things up.

I understand exactly what you are talking about as far as the "links" that connect the TA bushing to the fixed mount bushing needing to be perfectly vertical. Steve sent me his prototype arm and had me adjust the length on my car, so it would be exaclty the right length to get the correct vertical orientation of the links. But that was to get the correct length for the stock 10-bolt and/or my Strange 12-bolt.

You can see what he's talking about in this pic... ignore the rust. That is a "rough" front mount we mounted up to check clearance against the extended housing of the Gear Vendors O/D unit.

http://cjcfo.fbody.com/members/injuneerzz@aol.com/PhotosJ/DCP02968a.jpg

well since the car is at the shop and in the air. I need to go and investigate that transmittions tail/ driveshaft. If the trouble lyies with the mounting. i fear that braking the original welds and reweld the bracket on sounds like more of a hassle then reposition the crossmember (BMR) and readjust the controlarms, taking out the inch i added.


Does that sound safer? I had very bad luck with everything i do so braking the welds and rewelding sounds like i will have a problem later.

Thank you for pointing out the new trouble area with the driveshaft/transtail

Doesn't the 9-inch mount consist of 3 tubes welded to the housing, and a bracket that bolts to the tubes? Yuo wouldn't have to take the tubes off.... you would have to shorten them.

After seeing the picture you sent me, its really scrwed up. It looks like with the links pushed so far forward that the TA is already hitting the lower pivot tube on the front mount. For anyone trying to follow this, look at my picture, and think what would happen if you pushed the front end of the TA forward. As it moves forward, the side links that connect the lower pivot and the TA bushing rotate forward and down. Eventually the TA drops enough to hit the lower pivot tube.

Well after stopping by the shop the yoke is hanging out an extra inch. BMR is shipping the crossmember for $70 so i will try that. Along with replacing the LCA to the BMR tubular nonajustable ones i already have. So all i have to do is sell the adjustable LCA which have about 35 miles on them. A small loss, but....