Re: What is this? Thin spring inside where slip yoke enters transmission
Found a photo for you of at least one for sure spline size for the TH350 with a V8..
The caliper is just a cheapie and so the measurement shown is plus or minus probably about 1/16th lol
But still don't know if there were other sizes - might try typing in your truck on an auto parts website & see if it asks you to choose..
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