Anyone have any experience with a TrueTrac differential? I'm looking to upgrade to 35 spline axles with a TrueTrac diff and am mostly concerned with how it will hold up at the drag strip for the handful of times I make it out to the track each year. I really like their street manners after driving a couple of different cars with them installed and that's why I'm leaning that way. 482, 5 speed (TKX) Fairlane.
Thanks, Joe S.

   Rory, I put a TKX in my '66 Fairlane. Close ratio with .68 5th. The car has a 4.11 rear with 275/60-15 tires. I wound up cutting the tunnel just behind the shifter and welding in a small bump up to get more clearance for the shift rail casting at the back of the transmission, the shifter stayed in the factory location with the Lakewood scatter shield and aluminum spacer.
   The TKX trans mount is further back compared to the top loader and as a result the factory cross member would hit my X pipe. I fabbed up a new cross member rather than cut up the factory piece. Kept the factory clutch linkage and replaced the speedo drive gear with I think a 21 tooth gear and opposite rotation from the top loader gear.               

   The overdrive was a dramatic change from the old top loader on the highway! The shifter has a very positive feel to it, notchy until you put some heat into the transmission. After that it seems the faster you spin it the better it shifts. Oh and I had to have a new, longer, drive shaft made. Joe.

Thanks for the offer but I wound up ordering a one inch bar from CJ Pony parts last night. Hope it fits!

I used the Scott Drake C80Z-7515-B fork from Summit and it matches the big bearing fork exactly except of course for the width of the fork.

Here are some photos, I'm not sure if they're attached correctly. If not I'll email them to you.

If you do wind up going with shackles or different spring mounts be sure to check your pinion angle because it will change.

Is this Dennis's wagon at Musclepalooza?  3:02 in the Youtube link.

https://www.youtube.com/watch?v=3s7lbokx_o4

  Sorry to hear about your back but I do feel your pain. Just weighing my options right now, hopefully if things go according to plan I'll be in the market for a new set of heads in the Spring. Survival and BBM's are appealing since I could reuse my rockers as they are.