Turbo Terry, for the "few" extra dollars, the BD TorqLoc is well worth the money. The latest version (2. 1) has the operational features Nelson Buck described (manual TCC lock up, OE operation, and AutoLoc mode) PLUS, the OD inversion feature. This feature (if you choose to hook it up) automatically starts the transmission with the OD off as opposed to the OE, OD on. I had the TorqLoc version without the OD inversion feature, electing to upgrade to the 2. 1 version so I could obtain this desired (by me) feature.
To answer your question: "Does the AutoLoc install on the transmission outside?", All AutoLoc or TorqLoc connections are made "outside" the transmission however, there is one wire on the outside of the transmission that has to be "looped" through the AutoLoc or TorqLoc ECM by cutting one wire and splicing each cut end of same to two wires from the AutoLoc or TorqLoc. The remainder of the wiring is connected under the hood. . I elected to make the connections near the PCM. The TorqLoc has a 3 position switch, the AutoLoc does not need a switch (the AutoLoc is ONLY used in conjunction with an exhaust brake), so, if the exhaust brake is active, so is the AutoLoc.
Since you have a '99 24v, you will have to purchase the turbo to exhaust brake adaptor which runs about $90. from BD. With the OE turbine housing, it does not matter which exhaust system is utilized, all of them will bolt right up to the exhaust brake with two bolts (like the '94s through the '98. 5s). The exhaust brake is very easy to install, the TorqLoc or AutoLoc require a higher degree of (assumed) knowledge of automotive electronics. As Don Edmonds stated, the installation instructions leave something to be desired. It's easier to more or less bypass the written installation instructions instead, following the wiring schematic. BD's customer service is excellant. . they can and will help you through any difficulties you may encounter.
Next on my list (before May Madness): BD "Medium Stall" TC, BD valve body, and BD PressureLoc.
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'98. 5 2500 QC 4x4, (BLACK) SLT Sport, ISB, LWB, 3. 54 LSD, A/T, Glasstite Vision II canopy, Line-X bed liner, 285/75R16 BFG A/Ts on 16x8 M/T Challengers, Warn 4X Boards, Mopar fender flares, front and rear NW Custom stainless steel/rubber mud flaps, Mag-Hytec diff. cover and trans. pan, Edelbrock IAS shocks, Mopar tow hooks, Jordan Research Ultima 2020 trailer brake controller, VDO Vision gauges, PIAA Dual Sport 900 auxiliary lights and Super White bulbs, BD exhaust brake and TorqLoc, Prime-Loc fuel filter relocation kit, Bosch 275 hp. injectors, VA CPC, DD Boost Module, Banks Stinger wastegate actuator, "Scotty Air System", BLACK '00 valve cover, Hitco/Geno's exhaust blanket, Femco/Geno's EZ Drain oil pan plug, Banks Stinger 4" dia. stainless steel exhaust system, plus many other trick modifications
'00 Polaris 6x6