Your talking about the shaft that is sticking out the front of the tranny if so I've sone it but just taking the trann out and sitting the rear of it in a 5gallon bucket so it sits upright and take the front cover off and there is your input shaft with 4th gear on it. It just siting in the and the face cover has a bearing race in it and the input has the bearing on it I've done it before to my friends cobra going fron 10 spline to 26 spline took like 10mins to change no problems what so ever
So you don't have to take the whole tranny apart that above is false
__________________ 2001 Camaro SS SLP..M6
SOLD 403ci/AFR225s/TR v.2/EWP/Vengeance FAST102-102/GZ vp/ARH 1⅞/Kooks TD-CME/Textrilla Twin/S60-4.10s -568hp/512tq- 2004 Silverado 2500HD Crew Cab
Unbolt the front plate and the input shaft will come out.
A professional could do this and get the end play right but I wouldnt recommend an amateur do it this way. It'd be better to tear it all down. I, being an amateur, couldnt get the front plate to fit back down with the shift rails and such. I must have allowed something to shift while I had the front plate off. A plus to tearing it all down is that you'll be able to inspect everything else while you're there. Changing the input shaft means you have to change the shims behind the front bearing race to get your end play right and I think its a whole lot easier to set this with just the main shaft and input shaft installed. FWIW I think I shot for .001 on my total end play. Yea, its a lot more time but IMO worth the extra effort if you're not doing this stuff all day long for a living.
__________________ 403, baby cam'd, t-56 faceplated, detroit locker