This is my first draft of a write-up of the process to convert a TH350 3-speed auto LATE 2nd gen Camaro to a 2004R 4-speed Overdrive tranny. Parts you need: (Listed by the supplier I used.) 2004R 4-speed OD tranny (Purchased locally in a recently rebuilt condition...$520) Flexplate (Stock is fine. Mine was bent and needed to be replaced.) Shiftworks: Shifter cable (The stock one should work but mine needed replacing.) Shifter conversion kit ($80) Shiftworks Camaro Shifter Conversion The detent in the shifter is quite a bit different. BowTie Overdrives: Lock-up Converter ($175) Lock-up Wiring Kit ($70) TV Cable & conversion kit ($110) Speedo Gears ($60, I needed both gears.) Crossmember (The 75-81 crossmember is different from the 70-74 style. $175) Torque Converter cover ($20) Dipstick (Universal $30) Gasket & Filter All new hardware for everything ($30) Ebay: B&M Super Cooler tranny cooler ($40) Total parts cost= Approx. $1365 The Tranny preparation.... Clean out pan. Install new speedo gears. Install new lock-up wiring. (Good instructions with kit.) Replace Throttle Valve return spring with one from TV cable kit. (Again... good instructions.) Replace filter. Install lightly greased gasket. Install Shiftworks conversion shift arm on tranny. Place the shifter cable bracket on the pan & torque pan bolts to case @ 9ft/lbs. The tranny is ready for installation! Shifter Preparation: Remove shifter from car. Install Shiftworks kit following the instructions. Reinstall shifter. (Then cuss about the lousy label they use to redo the gear indicator lettering on the plate. It is invisible at night!) Design new shifter indicator part and hand letter new letters with white paint ofn the back side of the plexiglass I used. Reinstall all shifter components. The newly converted shifter will still work quite well on the TH350 so this can be done ahead of the tranny install. Camaro Preparation: Install Tranny cooler. (Follow kit instructions anf use zip ties or create your own mounting configuration.) Disconnect downshift cable from carb and remove carburetor from intake. Install the TV cable conversion hardware. Reinstall Carb. (The TH350 downshift cable will need to be disconnected from the carb to allow the new hardware to fit. You can still drive your TH350 but you will need to downshift manually.) Wire the car's portion of the lock-up harness. (I added a lighted switch so I could see when the lock-up feature engages.) The car is ready! Installation: I got lazy here and paid AAMCO to watch them perform the actual tranny swap. Disconnect battery ground and remove distributor cap so it doesn't get cracked while you jack around on the engine and tranny. After getting car high enough on tall jack stands or a hoist... Drain pan, remove torque converter cover, and dipstick tube, disconnect driveshaft, cooling lines, detent cable, backdrive linkage, modulator vacuum line and speedo cable. Support tranny with a jack. Remove crossmember bolts. Remove tranny to engine block bolts and TC to Flexplate bolts. Remove crossmember. Lower tranny. Put fluid in new lock-up torque converter. Mount TC to tranny. (MAKE SURE it is fully seated in the pump tangs.) Raise tranny in place and align with pins on block. Install crossmember and bolt the tranny to the block and crossmember. Install dipstick/fill tube. Connect speedo cable. Connect shifter cable. (Some adjustment to Shiftworks bracket was required.) Connect cooling lines. (Some bending is required. The fittings are the same between the two trannys.) Reconnect driveshaft and backdrive linkage. Plug in the lock-up wiring. Connect TV cable to carb and tranny. Cap the open vacuum connection at intake. Fill tranny with fluid. Reconnect battery and install distributor cap. Lower car and enjoy Overdrive! Problems encountered: Shiftworks .... Poor design on shift indicator labeling. (built my own as a solution.) Tranny mounted bracket needed to be modified to get better geometry on the shifter arm. BowtieOverdrives... Crossmember interference with stock exhaust flange at the inlet to the catalytic converter. Cat was removed for the install but Y pipe needed to be shortened for clearance. An aftermarket cat was then welded into the exhaust system after the tranny install was completed. Summary: Yes... this post is a book but this is a multi-phased job, IMO. I hope it helps anyone with their decision and installaton of an OD tranny! I left out plenty of little details and specs just to get this done today. Ask any questions about this swap and I'll try to answer them.