[TR] TR3 rear suspension leaf spring question

[gdewine at aol.com]

I put my 1961 TR3 back on the road several years ago. The car had been dissembled in the late 1970's by the previous owner for a repaint. The car was painted and never reassembled until I purchased it in the late 1990's.
The rear suspension is stiff. The leaf springs are rigid and have no flex. The car is rust free and in amazing condition. 
I am looking for advice on how I can bring? life back to the rear suspension without total disassembly. I am thinking penetrating oil on the leaf springs may help. Advice will be appreciated. I bought rebuilt shocks which I will install shortly. 

Gary
1961 TR3