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Originally Posted by thorsen
1. Gas mileage - how much, if any, did your mileage improve with the 2.47 differential.
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Not a 2.47 but I replaced the 3.07 in my sedan with a 2.88...saw slight improvement in mileage...on average, about 1 mpg better (this car gets driven almost exclusively in town) and no decrease in performance. Road trips are much nicer since the engine is no longer spinning 3400rpm at 75 mph. IMHO, It was definitely worth the effort since todays' highway speeds spin these engines way too fast.
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Originally Posted by thorsen
2. Installation - I know you need to remove the halfshafts from the diff, but do you need to remove the halfshafts from the wheel hubs?
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Yes, remove the shafts from the wheel hubs. They will be in the way when you start monkeying around with the differential if you leave them in the hubs...
When you get ready to pull the axles, remember to raise the entire differential/subframe assembly up into its normal position. If you do not do this, there will not be adequate clearance to move the axles inwards and get them out of the hubs.
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Originally Posted by thorsen
3. Installation, part II - Can one simply unbolt the flex disc from the diff, or does the 'gland nut' on the driveshaft need to be loosened (that's the procedure according to the FSM).
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Yes, you will need to loosen the gland nut too (don't tell anyone but I use a pipe wrench on mine). Then just unbolt the flexdisk from the diff. Don't forget to push everything back into position and retighten that nut when you are done. FWIW, for some reason, one of my cars doesn't have enough clearance, even with the loose gland nut, to remove the drive shaft from the diff. On that one, I have to remove the bolts from the driveshaft center support and let the entire shaft hang loose in the tunnel.