Originally Posted by
Ronsonic
Here's the important part:
"The large cog on the cassette is a 32 ...."
I suspect back when XT was a 7s group they didn't plan on 32t cogs or the amount of chain wrap you have. XT did come in different cage lengths and that will be a big factor in how much chain wrap is permitted.
I think you nailed it.
The rear derailleur was taken off of an old Univega Alpina Sport, as were most of the parts, and it worked great but it had a 7 speed freewheel w/ a 28 large sprocket. I am now using a cassette (sorry I didn't specify this but didn't think it was significant) w/ the large being 32. Combined w/ a 24 difference up front was creating havoc. I bought the Cross Check hoping to use all used parts that I had and I came close. I found an inexpensive Deore long cage at Jenson that I think will make things right but also might have to get a larger small chainring.
Anyway, thanks everyone for your help.