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#1
22nd August 2012, 12:04 PM
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A8 trans swap - 5hp19
Hi guys,
I recently bought a really nice '00 40V A8 4.2L and I am looking to put it in a mid-engine space frame with a 2.8 a6 FWD Auto transmission. I've been told it's a bad idea but want to do it anyway because my options are limited and this specific build needs an auto. I can't find any info online related to this swap but I want to know basically how different the wiring and computers are. The ecu's look exactly the same to me, can the a8 ecu be used? Do I need the wiring harness from the a6? I was hoping someone here might know because there isn't one person on the several American audi forums that does. I have yet to start tearing the A8 apart. So basically 5hp24 to 5hp19, any idea? Last edited by tallon; 22nd August 2012 at 12:14 PM. 
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#2
22nd August 2012, 12:15 PM
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Transmission swap
I think they use the 5hp19 on the 3.7 a8 but I might be wrong...maybe someone could confirm that for you...
In short I don't see why not but not sure if the ecus will be compatible...
__________________
01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012
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#3
22nd August 2012, 12:36 PM
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Use original 4WD gearbox just weld up centre diff and blank out rear otput.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#5
22nd August 2012, 01:48 PM
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Quote:
__________________
Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#6
22nd August 2012, 03:24 PM
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AWD though? or maybe it doesn't matter... mine would be the 5hp19FLA fwd version
so hopefully the newer 2000 4.2L A8 is similar electronically I just wanted to be sure before tearing the car apart :\ Architex did your trans need to be replaced or something? I was looking for aftermarket parts to make it stronger since the 4.2 probably has even more torque. Not exactly familiar with what parts are weak, though. Last edited by tallon; 22nd August 2012 at 03:32 PM.
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#7
22nd August 2012, 09:20 PM
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Hi Tallon,
I have a similar idea for a project and all you need to do is get the TCU to match your transmission. Yes you 40V 4.2 has more torque but if it's from an A8 its not that much more, so a 2.8 FWD tranny should be able to cope, especially if your target vehicle is a lot lighter.
__________________
Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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#8
22nd August 2012, 09:32 PM
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Quote:
__________________
Confidence is the feeling you have before you know better . . . . Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#9
22nd August 2012, 10:23 PM
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thanks guys for the info
someone else told me I should be good in a light car as well which makes me feel a little better about it, I'm going to try to not add too much weight as I'm still working on the chassis. I think I'm going to get the upgraded D Drum since it's the piece that is always breaking for others. I wish there were more upgraded aftermarket parts. It seems I'll never be able to increase power of my car with this trans. this is the aftermarket part they're saying is stronger http://www.youtube.com/watch?v=L3fD-lYHpdA&feature=plcp reverse d drum brakes where it's holding snap ring and clutch pack. Does this affect other gears or just reverse? I don't see where else is an issue as far as it being weak. Last edited by tallon; 22nd August 2012 at 10:57 PM.
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