I,m running an A spring under the rear of my 34. Using 10 leaves and it gives a nice ride. Over the last year it has started to drop so I made and installed a spacer as a temporary fix. I can have the spring reprofiled ,could also add another leaf but don't want to spoil the ride quality. Any advice?
If it was an original spring that started to droop, I’d think it might continue. Like it has something wrong. If it’s a new spring, maybe that’s as far as it will go. I’d think you could put a little re-arch in it and it would probably hold. But I’m no expert.
Got any pictures? I'm having a hard time visualizing a Model A rear spring in a 1934 Ford. Unless you're talking about a Model A front spring on the rear and that would be too short.
It sounds like the spring has slowly lost some of its arch from normal use. Having it professionally re-arched is usually the best long-term fix without hurting ride quality. Adding one thin leaf can also help if matched properly. You might also want to check bushings and shackles, since worn parts can make sagging look worse.
I’m also curious if it is an original spring or aftermarket. either way I would let it ride with the spacer until I was confident that it was done continuing to to settle. Then pull the spring pack apart and add some arch back to the main and maybe the next two leafs. I’d do it exactly the same as you reverse a main leaf in your garage but use the process to add some arch. Easily done. in an afternoon.
Thanks for all the replies here. I should have said it's an aftermarket spring. I think it settled as much as it's going now. Had some econoline springs redone by a company here last year and they worked out great.