To expand on
@GoMachV's pretty thorough details, including what
@Frankentruck has mentioned.... mind you, this is all off the top of my head.
Basic 4WD touring chassis list and history:
TA Series touring cars: Original onroad / light rally 4WD chassis, began with shaft, but then updated to
belt drive. Started the scale touring explosion with the TA-01 and TA-02 series vehicles (shaft-drive), before switching over to belt drive with the TA-03 (loved by old-skool drifters). Currently up to TA-08.
TB Series touring cars: Onroad / rally 4WD chassis, with
shaft drive. Started with the TB-01 vehicles. Currently up to TB-05. TB-01 was rally-oriented, with dust shields and chunky plastics, but TB-02 onwards more onroad.
TRF4xx Series cars: Race-inspired
belt drive 4WD touring chassis, with high specification and price.
TB Evo xx Series cars: Race-inspired
shaft drive 4WD touring chassis, again with high specification and price.
TL-01: Entry-level
shaft drive 4WD platform. Good for mounting realistic bodies. Can be made into a rugged rally car with a bit of work. One-off chassis, no series (i.e. no TL-02). Also available as a wide-arm buggy chassis (TL-01B).
TT Series touring cars: Entry level touring / light rally 4WD chassis, with
shaft drive. Started with the TT-01 vehicles. Currently up to TT-02. Any number of Subaru WRX rally car releases. Also available as a wide-arm buggy (TT-02B) and truck (TT-02T).
XV Series rally cars: Rugged rally 4WD sedan chassis, with
beltdrive. Started with the XV-01 vehicles, and progressed to the XV-02. High specification chassis.
Front Wheel Drive Touring: Also produced were a range of FF-designated front wheel drive touring cars, beginning with the FF-01. Currently up to the FF-04 (I think), although I'm not up with the later versions of this line.
FF-01 was a specially-produced FWD adaption of the TA-02 series vehicles, using the same chassis tub and many parts, but with a unique front gearbox and slave rear end.
FF-02 was a the chassis from the M03 FWD M-chassis vehicle, lengthened with a chassis extension piece to make 257mm track, and with arms from the TL-01 to give 190mm track.
From FF-03 onwards, became a unique FWD chassis vehicle (i.e. not a conversion of an existing chassis)*.
* I think...
M-chassis variants: smaller chassis vehicles, meant to provide scale layouts and sizes. For the 2WD models, odd numbers (i.e. M-05) mean front wheel drive, and even numbers (M-02) mean rear wheel drive.
Releases generally paired as a FWD / RWD pair, sharing parts across the two vehicles, although this has become less and less over time. Early ones could have very basic entry-level specification i.e. no oil shocks.
Hop-ups for these are an industry unto themselves.... especially for the later models.
M-01 / M-02 shared the most parts, as the chassis was (generally-speaking) merely reversed to change the drive end (not quite that simple, but close).
M-03 / M-04 shared some parts, but M-03 shone as a fun race chassis, whereas M-04 was a bit meh.
M-05 / M-06 was a new generation, sharing even less parts. M-05 proved to be (arguably) an even better race chassis than the M-03. M-06 was good for displaying a nice RWD body
M-07 / M-08 became more race-oriented chassis, although could be still fairly basic in kit form.
The Weird Ones: As well as higher-spec kits along the range (e.g. TA-05MS, M-03R, TB-04 PRO, etc.), there were a few 'specials' along the way.
TA-05 MFour: A 4WD M-chassis sized vehicle, based on the belt-drive TA-05 layout but with a smaller track and wheelbase. One only model, quite rare.
MF-01X: An interesting, current, shaft drive 4WD platform. Very much a scaled-down version of the TL-01 chassis, with the same layout (prop shaft along the right hand side of the chassis) and gear set, but with M-05 arms. Weirdly (from a scale perspective), released as a rally VW Beetle and a Mk2 Ford Escort - both RWD vehicles! Also released as a Suzuki Jimny and a Merc G320
Cabrio.
TC-01: Another current shaft-driven 4WD chassis, like a parts bin special of ideas from the recent range of touring cars, with a nod back to the F201 4WD F1 model from 2002. Can be built as a touring or formula car, with body mount and bumper changes.
Not considered:
All the Formula 1 models (i.e. F103 or F104, etc.)
The Group C chassis (i.e. Ferrari F40)
The F201 4WD F1 chassis
The RM-01 1:12 re-release chassis
Hope this helps!
Alex