Re: 56 Ultramatic

Posted by Ross On 2023/10/12 6:54:04

On 56 trans I shim the A spring 1/8" to raise the direct shift point somewhat. I just drop a #10 nut in the bottom of the #3 valve before inserting the spring. I trim the B spring about 3/16 to lower the low-high shift point somewhat. I find that shift pattern much more agreeable.

On 55s and gear starts I merely shim the A spring 1/8" as their low-high shift comes soon enough.

If you increase the tension on the A spring too much the direct shift will come way too late or not at all.