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Another pic of axle splines

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For stock axles the splines arent too bad... my go fast
axles look worse than that... they took a set and have
stayed that way ever since

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What do you mean by "split the sleeve"?
I don't understand.

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Its a 489 case, right... it uses a crush sleeve on
the pinion... apply enough load and the pinion will
push forwards and crush it more and thats the start
of what you have... heavy cars WILL break a 8 3/4...
I still use a 8 3/4 but my car is light... with a 1.19 60'

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For stock axles the splines arent too bad... my go fast
axles look worse than that... they took a set and have
stayed that way ever since
Not afraid of them breaking off when twisted like that?

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Anything is possible... but they have been in there
that way for 8 years now

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Mike,
a friend helped me drill out the 7290 yolk and attached heavier straps and grade 8 bolts/nuts the day before I went to the track.
I removed the yolk for drilling.
I knew I had the 489 with a crush sleeve.
The pig was just freshened with new bearings & pinion seal last fall.
I re-installed the yolk and torqued it to 190 lbs.
I was told by the person who re-built my pig that he torqued it to 225 ft. lbs.
The yolk definately felt different(tighter)after I torqued to 190
I was gonna step it to 225lbs after I reached 190 but stopped because it felt tighter.
The next day after driving it to the track,it broke on the starting line after 1 easy pass to break in the new slicks.
Do you think I probably crushed the sleeve further,and changed the pre-load?
John

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If I were to race(or even street drive) the 489 I
would go with the solid sleeve... did you change the
pre-load... most likely... if I need to pull the yoke
I torque it back to spec(or damn close).... JMO on
the preload... but either way... a heavy car and 4 speed
with slicks and have good bite.... something has to give

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He's telling you , be proud, your 383 is a monster that just ate your rearend .

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Stout engine.