2001 V70XC viscous coupling to permanent 4wd

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R

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Helar J
Posts: 1
Joined: Mon Nov 21, 2016 12:59 pm
Year and Model: 2001 V70XC
Location: Tartu, Estonia

2001 V70XC viscous coupling to permanent 4wd

Post by Helar J »

Hey everybody!
I have a 2001 V70XC with the old pre-haldex system. For some time already I have thought if it is possible to remove the VC from the rear differential and lenghten the cardan shaft so that there is no VC in between. The rebuild itself seems fairly easy and the outcome would be a nice, permanent 4wd. With this idea some questions popped to my head.
1) Has anyone ever done something like this?
2) Are there any dangers involved?
3) Should I know anything more involving the rebuild?
Thanks in advance!
P.S.
Sorry for any grammar mistakes etc. English is not my mother language and I haven't had a good practice in a few years :P

Richard99
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Joined: Tue May 22, 2018 2:45 pm
Year and Model: 2000 V70XC
Location: San Francisco
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Post by Richard99 »

This is an interesting proposition. Trouble would be getting a prop shaft of the perfect length. If that could be done would be a perfect project as these cars have beefy rears and the VC can sometimes cause trouble.

Eric
Eric

1998 Volvo V70 - rear-ended and totaled
2000 Volvo V70XC
2007 Volvo V50 T5 AWD M66

Blacklab467
Posts: 261
Joined: Tue Aug 09, 2016 4:25 pm
Year and Model: 2003 xc 70
Location: Calgary, AB
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Post by Blacklab467 »

I think it would be a challenge on two accounts; first you would need to couple the propshaft to the rear differential obviously, that may involve another joint or support bearing to prevent vibration, also some fabrication on the coupler.....I cannot recall how the VC ordinarily connects to the diff. The other problem would be that the DEM style electronic logic would be confused if you removed the coupler, I'm sorry but I don't really know what electronic components the 2001 system has so maybe someone else can provide input on this. I know that in my '03 XC the DEM gets input from many sources seemingly unrelated or pertinent to demanding AWD.
How about a simpler option of repairing or rebuilding your AWD? They work extraordinarily well in stock form and parts are readily available.
2003 XC 70, 2007 Duramax LBZ.

Blacklab467
Posts: 261
Joined: Tue Aug 09, 2016 4:25 pm
Year and Model: 2003 xc 70
Location: Calgary, AB
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Post by Blacklab467 »

It also might be easier to weld the viscous coupler together and run the stock unmodified propshaft with all other components installed and present but then.................why not just make the existing AOD AWD functional by fixing it? Unless you want to make a huge project and like doing fabrication and machine work.
2003 XC 70, 2007 Duramax LBZ.

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