A4 to A3 swap???
 

What are all the parts needed to swap the 460LE to a TH350/400.???

This is what all I bought, and the work that had to be done:

Madman & Co. Racing --
TH400 Kit included:
Transking TH400-Reverse Manual Valvebody/Transbrake
Transking Stall (you choose what size) with nitrous anti-balloning plate
M6 Tranny Mount (didn't need it because I was running an M6)
Aluminium Nitrous Prepped Driveshaft
Billet Input Shaft (Optional Upgrade)
B&M 28K GVW Tranny cooler/ braided hoses/ Aeroquip fittings
Madman locking dipstick/w tube

In addition I also purchased:
$200-TCI Flexplate (or ask Brian about his custom flexplate $$$)
$290-Cheetah SCS gated shifter w/transbrake button
$20-TH400 tranny mount (local parts store)
$25 ARP Flexplate/flywheel bolts (jegs.com)
$12 on washers (tranny mount shims)
$50 Autometer Transmission Temp Gauge
$10 wiring, electrical connectors etc.
$40 1 case of B&M Trick Shift (non synthetic)
$40 ARP Converter bolts

I also upgraded too:
$400 Spohn Torque Arm w/DS safety loop (stock torque arm must be changed)

The install is pretty straightforward. I highly recommend that you use a lift, as I cannot imagine how bad it would be to do this while laying on your back!!

Unknowns?--
A4 to TH400 may require some sort of tuning??
Speedometer is optional, and will require more parts and more $$$$
Plan on everything taking twice as long to complete. (shifter should of taken a couple of hours.....6 hours later it was in, and working)

I highly recommend you talk to Brian at Madman Racing.

Thanks for the thorough description. just what I needed for the fall project.

why trans swap
 

is the 4 speed to weak for your application????

Planning a 347 forged with 200 wet DP. Target
650 rwhp, and who knows perhaps more.

Also looking towards a 366 forged offset stroker