Just to make sure. You're talking about the piece in the middle at the top?
Does the input gear spline look like either of these?
![](http://board.marlincrawler.com/images/bm/splines_vss.jpg)
Or possibly this one? TG
![](http://www.trail-gear.com/images/2006-6240-600.jpg)
Also, do you know for sure it is for a 4.7 gear and not just a stock input? Just asking.
How many splines? 21 or 23