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| D2 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc. |
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#1
29th March 2021, 11:36 AM
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PF / FL Subframe Differences?
Have got the opportunity to get my hands on a pair of good subframes, only potential issue being that they are from a Pre-Facelift whereas my 3.7QS is a 2000 Facelift.
I'd be transplanting all of my own components over onto the new frames - any idea anyone if the PF subframes will fit okay. Any small or any significant differences anyone is aware of please? Thanks!
__________________
2000 FL A8 3.7 QS - Turned 21 years old on 15th March 2021. Ming Blue - 175k miles. I love having a 90's car worthy of 90L of 98 RON! If only they still did 4* fully leaded! 2009 A8 4.2 FSi LWB - Marine Blue - 164k miles. Extras? Too many to list. But I do like the Rear Seat Entertainment . . . . . . 477k miles to the moon and back. 238k to go and between them they'll have made it! 
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#2
29th March 2021, 01:51 PM
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The front is the same apart from the mounting holes for the subframe brace between the gearbox mounts which the FL has.
The PF rear subframe is the same part as the FL A8 which will be fine for you.
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#3
29th March 2021, 01:59 PM
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Thank you!
Is it possible to simply drill the holes for the 'subframe brace between the gearbox mounts' you mention?
__________________
2000 FL A8 3.7 QS - Turned 21 years old on 15th March 2021. Ming Blue - 175k miles. I love having a 90's car worthy of 90L of 98 RON! If only they still did 4* fully leaded! 2009 A8 4.2 FSi LWB - Marine Blue - 164k miles. Extras? Too many to list. But I do like the Rear Seat Entertainment . . . . . . 477k miles to the moon and back. 238k to go and between them they'll have made it!
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#4
29th March 2021, 02:40 PM
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Yeah you could do. There are welded nuts on the FL version which you could either replicate or just use a nut & bolt, although access would be tricky since they are behind the gearbox mounts.
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#5
29th March 2021, 06:34 PM
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Have done a bit of looking into this. But can't quite picture it all. Is this the brace/support of which you speak?
And in the exploded diagram: If I am right, I can't picture what holes might be missing on the subframe. Which means I'm looking at it wrong, of course. To me it appears that the rearmost 3 holes must go into the bodyshell/floorpan, the middle large one must be there for the main mounting bolt through the rear bush and the frontmost 2 (bolts #42) are part of the brace itself. Can you correct my vision, please?  Just trying to judge the difference in jobs between tarting up a rusty FL subframe vs drilling and welding a PF.
__________________
2000 FL A8 3.7 QS - Turned 21 years old on 15th March 2021. Ming Blue - 175k miles. I love having a 90's car worthy of 90L of 98 RON! If only they still did 4* fully leaded! 2009 A8 4.2 FSi LWB - Marine Blue - 164k miles. Extras? Too many to list. But I do like the Rear Seat Entertainment . . . . . . 477k miles to the moon and back. 238k to go and between them they'll have made it!
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#6
29th March 2021, 07:47 PM
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Part 43. The captive nuts are hidden between the gearbox mount (4) and the subframe, in the flange where #5 goes
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