Generally shimming the spring will not help with low oil pressure at idle...at least from what I've seen. It could help with oil pressure at higher rpms however...but how much? You're sort of guessing. Please don't stretch the spring. Not a good scheme. If you could find a new spring that might be better.


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end