Pinion angle question - 14bolt swap

[firefighter184]

OK, so I bought the spring perches from DIY (ordered anyway, should have 'em soon). Now, I have a vibration in the driveline ever since I did the 4 inch springs out back. I plan to change the pinion angle when I put this 14bolt under the Blazer and try to remedy the vibe. Without having to put the perches and the axle under the truck and trying to figure out a good angle, is there a formula or other way to guesstimate placement of these perches? I have help with a welder, but I'd like to be able to throw the axle in the back of my Ranger and just take it over to the guy instead of having to to the whole dang swap it his place. Ideas? Suggestions? I was thinking of just moving the perches forward about 1/4 inch on the tube and going from there. If it's too much or not enough, I can shim it. Whaddaya think?

 

[goldwing2000]

Set it up under the axle, mark the position with a sharpie and then take it to get welded.

The pinion angle should be the same at the t-case output angle. I'm sure there's a way to figure out where to put the spring perches with a plumb bob, a slide rule and the position of the sun but that would be getting all mathy. Easier to just mock it all up, mark it and glue it.

Fwiw, I'll be doing exactly the same thing in a few days but I have my own welder, so I don't have to take it anywhere.

 

[70jimmy]

I am sure there is a way to figure it out. I would just bring the welder to you and have it all under the trunk and point it at the t-case and then weld it. That is the way I did it.

 

[firefighter184]

I am sure there is a way to figure it out. I would just bring the welder to you and have it all under the trunk and point it at the t-case and then weld it. That is the way I did it.

I'm thinking that's the plan. Thanks guys. Hey Duane you fix that dent yet? If it makes you feel any better, mine are unfixable...