The gearboxes are the same. Actually except for the larger concaves, perforated cage w/more vanes, feeder reverser, modernized control box and grain loss monitor, the 1482 and 1682 are the same machine. The 1985 1482's even had the Case IH decals and paint.
1682's had optional internal chopper. The differences mirrored updates that occurred in the 1480/1680's. I think the last 1682's were built in 1989/1990 but some were stamped as new as 1992 (all were still short shoe/sieve machines).
The 1682's were much nicer to run with the hyd pickup drive and 1015 series header, feeder reverser, heavier three paddle rocktrap beater. An optional on-board hyd system to run pickup and after-market straw/chaff spreaders was available .
One of ours has a longer unload auger(great if you leave duals on tractor) w/triple drive belt/pulley system and an Urvold self contained hyd straw/chaff spreader (excellent unit !!!).
JD made a 9501 PT combine in 1989-92
. Have only seen a few and they brought good money even though they were suposed to have a few problems.
Lots of diehard JD guys up here ran a 14/1682 as main combine or kept one for second/spare/backup machine for/to their 7720-9600's.
With modern 200 HP full powershift tractor (creeper gear if possible) CIH would still be selling lots of these new today!!!!!
Even with the 3 2388's we run (and a 1480 as backup) We still think of buying a couple CIH 7240-7250 MFWD's (w/creeper) to have for running 1682's even though other than pulling a Flexi-coil S65 120' sprayer or buying a big snowblower we don't have much use for one.
If CIH announced they were bringing back all the equipment they produced in the 1989-1995 era (and the 98-03 88XX series swathers w/a HB or Agco 5200 header!!!) at reasonable prices; i think they would see a HUGE sales increase!!!!