10 speed blues

So while pulling the engine/transmission out of an old international dump truck, the chain on the back of the engine broke and the cast iron transmission cracked in both front and back sections. Ouch.

The gears and parts inside are likely still good (TBD) and I'm looking for a good used case to reassemble with new gaskets, seals, etc., etc. as good used ones are pretty pricey and most have a core charge (my old core isn't likely to get full credit).

I'm having trouble finding a like for like core at a reasonable price and wondering whether the cases are all the same on the 10 speed models. The one that broke was an RT6610 with a 1.75" spline an a 28.3" overall case length. 10 speeds with 2" splines are obviously much easier to find and look very similar but the transmission length showing up on the eaton charts for most of those is 28.9".

I did find an a used RTF910 at a reasonable price. It's 200 pounds heaver and would probably require some extra support. The seller claims it has a 1.75" spline. Maybe that's the best route as I'm wanting to preserve the 10 speed gearing I have now rather than going down to a 6 speed.

Looking forward to feedback and ideas from anyone with experience on these.

 

Thanks W923; does your 7 speed have SAE2 bell housing and 1.75" spline?

 

Thanks BoxCarKidd; did the 9510 have an SAE2 bell housing and 1.75" spline?

 

Thanks little cat 500, I'm 99% sure that is the bigger 10 speed with the 2" spline that weighs around 700 lbs (about 2X more than the RT6610).