model a spring perch width.

rite now the tudor is sitting on a 6x6 pc of wood. it has a 9" rearend, the extra parts include new stock rear spring, shackles and weld on perches. i have not been able to find a dimension for the perch width, any help will be appreciated. thanks again, john

 

I think 6 inches to the bolt centers would be good. There is no set rule on what it should be.

I've never read anything on it but my thinking is the spring should be held tight in the center. Keeping the spring from rocking side to side. This lets each side work independantly.
Clark

 

thanks Clark, for your response. i am looking for the perch width across the rear end. i have been scouring the net for days trying to find this dimension, i found a forum that had an article on a similar topic.the dim. given was 49.5 c to c . i will continue tolook to confirm these numbers. i wish i had a stock a that i could measure. thanks again, john

 

When you say stock type spring, for what year?
Say the year and someone can measure a stock rear for you.
If it's a 40 I can help.

Mart.

EDIT: read it in the title: Model A.

 

its a 1930 model a tudor.the spring i have has 8 leafs, i may remove a couple leafs to obtain ride height i desire. i understand you must stretch the spring to install it to the shackles.thanks Mart.

 

stock is 49 1/4...i pulled my springs out and now have 5 leafs...after the spring settled i had to move the perches to 49 5/8...shackles are now at 45 degrees.

 

thanks Gary, when you removed the leafs, how much lower did your car sit. thanks again

 

I welded mine at 49.5 if you go much wider than that it gets you really close to the backing plate for the brakes. what type of weld on perches are you using?

 

I'm installing new rear spring perches on my '31 Tudor now. I'm runnin' a stock boxed frame w/'36 banjo, reverse eye posies spring and Pete & Jake shackles. Posies recommended to me 48-1/2" to center of perch sleeve on a spring over setup using the model A style perch and could go up to 49-1/2. Installed and at rest with weight of car the shackles should sit at approx. a 45* angle. Good luck, Jeff

 

well, the rear settled and became to low, to stiff, and the shackles hung wrong. thats why i re-did the rear..... i set up the spring first , then shortend the rear "Z". I didnt compair the spring befor and after...because i was starting over at that point.

 

thanks guys, looks like 49.5 is a safe number for 6 leafs and a little lower stance. won't be getting to that for a week or so, any more info is always appreciated, thanks again, John.
p.s. not sure whos perches they are, they came in trade with the "A".