Anybody mess around with thrust angle on rear ends?

[hunt2elk]

.025 degrees would offset the front end about .050”. This is nothing. Leave it alone. I’d question if that’s even within the tolerance of the measurement. Sure, when you see a car “crab walk” down the road and can visually pick out an inch or two, that’s a real issue. .025? I defy anyone to see it, let alone measure it twice in a row. Heck, change your front wheel bearings and it’ll move that much.

I made a mistake in my first post, but corrected it now. I am at + .25 degree, not 025.

 

[hunt2elk]

.25 degrees is worth the effort to make it better. I personally would start with 3/16, then I would shake down the rear suspension to relax the movement i made in the rubber bushings.
If the thrust line is .10 or less I would lock it down and adjust the front end.
I guess if you need perfection, then you will need to modify that front bracket.
There are 1000's of new pickups driving down the highway with a thrust angle between .10 and .15 I
My car was at .09 when I aligned it in my shop the last time. It drives straight and handles well. I will be replacing the 50 year old rear springs this winter and I am now anxious to see how far off it will be afterwards.
My hat is off to your alignment guy for mentioning your thrust angle though.

I have a pair of these from Cass that I run on the nut side. Was thinking of trying to fit both of them (.275") on the side I need to shim. That should get me a lot closer than I am now. I think my hanger studs may get short however.

 

[Scott Engelhardt]

Are your stiffener plates on the nut side? I guess I am not familiar with these.

 

[Nate S]

I have a pair of these from Cass that I run on the nut side. Was thinking of trying to fit both of them (.275") on the side I need to shim. That should get me a lot closer than I am now. I think my hanger studs may get short however.

View attachment 1192934

It should be only one, not both for .25 degree.

 

[hunt2elk]

Are your stiffener plates on the nut side? I guess I am not familiar with these.

Yes, I put them on all my cars on the nut side. But they can be used on the other side of the frame to adjust thrust angle as well, according to Cass.

 

[oldkimmer]

Is this out on both sides? So 1 side is -.25 and the other side is +.25? Solid rear? Kim

 

[hunt2elk]

Is this out on both sides? So 1 side is -.25 and the other side is +.25? Solid rear? Kim

No. A positive thrust angle means the rearend is angled to the right and a negative thrust angle means it is bias to the left. You only shim or adjust one side.

 

[oldkimmer]

Yes, I realize that. That’s why u only shim 1 side. Kim

 

[hunt2elk]

Yes, I realize that. That’s why u only shim 1 side. Kim

Yes, guess I misunderstood your question.