Curious why they had to put a larger (but very slightly larger) input shaft behind the trailblazer motors?

 

I think when they went to the removable bellhousing ('98-'99?) they went to 300mm for the LS and LT1 and standardized on that. The I-6 in the Trailblazer I believe is the same, just a different bellhousing for the 6. It's not just 2mm... the 298mm setup the input shaft has a pilot at the tip that necks down for 3/4" or more, while the 300mm the splines go all the way to the end of the shaft's tip. If the bellhousing has a hole at the very top it is 300mm. If it only has the bolts up the sides and not the very top point, it's 4.3 v6 bellhousing or pre-LS/LT1 (I think.)

 

Imma stick this right here.... These option codes are located on the TOP of the transmission on a STICKER which may or may not be there. So all these chuckleheads on Facebook marketplace claiming to have a 4L65 but it has a sticker that has anything but what's listed below....have a 4l60E.

https://www.s10forum.com/threads/4l6...e.850907/4L65E (RPO M32) codes
2001, 1KZD

2002, 2KZD

2003, 3KZD

2004, 4SSD, 4KZD, 4CTD

2005, 5HMD, 5KSD, 5KCD, 5SZD, 5CSD, 5CTD, 5CZD

2006, 6HMD, 6KSD, 6KCD, 6CZD, 6SZD

2007, 7CSD,7HBD,7KZD,7SZD

2008, 8HBD

2009, 9HBD, 9HED

4L70E (RPO M70)

2006 6KMD, 6CWD, 6CMD, 6TKD, 6SKD

2007 7CFD,7CMD,7CWD,7KFD,7KMD,7SKD,7TKD

2008 8KGD,8SKD,8LGD,8TKD,8CFD

2009 9TYD, 9YSD

 

With out irritating anyone too much, can anyone tell me how to identify a trans I bought off market place........the sticker is gone, and the code on the bottom looks like this. all I find online says it's a 1996 al60 but the input shaft looks to be the larger (300mm) with no smooth snout.

 

post an image of the input shaft if you're going to mention it

Measure it next...and count the splines

More than likely it's the 245mm input which was used in v6 applications in 96