Seth, I got my 3.73's from Ebay... just be careful who you buy them from. All you really need is the gears themselves, (the ring and pinion). The pumpkin you bought already has the Trac-loc in it. (some of the posts sounded confused on that point)
Buy a set of 3.73's and the two diff rebuild kits.. (one is for reassembling the pumpkin and the other for the trac-loc itself, including new clutches). then take all the parts and kits to a reputable rebuilder and have him put them together.
LOL almost felt sorry for the guy that did mine. I showed up with a VERY worn out 3.27 trac-loc pumpkin, the two rebuild kits, the 3.73 ring and pinion, and an aluminum Mark VIII case and said "i want the parts out of the old case, rebuilt and assembled in the aluminum case, with the 3.73 gears, using an F-150 "S" spring"... LOL fortunately he a good ol' small town guy who knows what he is doing. When he was finished I picked up a brand new rebuilt 3.73 TL in an aluminum case, and a box full of old, worn out, and VERY stinky dif parts.
But I digress....
To remove the rear end, just loosen the rear spindles from the control arms giving them room to move.. then remove the driveshaft bolts. Pry the shafts from the diff with a big screwdriver, (they should just "pop" out) then put a jack under the diff and remove the bolts holding it in place... lower carefully and roll the jack out.
Oh yea, you'll ned to remove the exhaust to.
If you want any help, just let me know and I'll see if I can manage a trip over to springfield.
1997 Thunderbird Sport
destined to remain stock
1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
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