Thanks for the responses. I got all of my third members out to compare. I'm having a brain freeze. I know there were 2 different U-joints, and if I remember correctly, the differences were very big/large. As I measure the yokes on the units I have, I am coming up with a slightly larger (1/8" over length) yoke on the 742 casings than on the 489 casings. The diameter of the u-joint receptacle appears to be the same on both. Although I haven't been under the G yet, I think it has a 985 casing which I think is the same as what I have mentioned previously. Does this sound close enough that I could swap without changing yokes? Are the differences in u-joints large enough that it would be hugely apparent? I am looking at the 2.76 vs. 3:23 more for highway driveability vs. mileage. I may be in Western states where speeding isn't a capital crime as it is in Ohio. If I go with the 2:76's, I will change back to 3:23 upon return home. Finally, does cast iron get heavier over the years? These things are nasty, I don't remember them being this heavy 20 years ago. Richard >>> "Richard Osborne" <richard@xxxxxxxxxxxx> 06/14/08 10:16 PM >>> Good evening, Thanks to Murray Park, I know have a 3:23 sure grip to install in my G hardtop. But, I also just remembered that I have a 2:76 sure grip as well. I am looking at a long road trip this summer and am thinking about the 2:76 instead of the 3:23. Anyone with an F or G ever tried running these gears? I assume it will make the car an even bigger turd in town, but the highway might be nice. Any experience out there? I'll skip over the 4:88's for this swap. Thanks, Richard Osborne ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/