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Took my 03 XC90 T6 AWD in for 90,000 mile service. Service Tech indicates that the boot is cracked allowing transmission oil and leaking grease to mix and flow back into the transmission. So, they not only want to replace the axle and joint, but flush the transmission 2, possibly 3 times. all this to the tune of $1000.00+ -- best estimate. <p>An independent guy says this mixing of fluids is impossible and that the major issue should have been advising me of the catastrophic damage that could occur if the CV joint fails. This wasn't even mentiioned to me. I don't mean to sound like an idiot, but I just drive it and get it serviced, and RELY/RELIED on my dealer to help me make the best decisions for my safety and the continued health of my car.<p>My question -- Is it really possible for the oil and grease to mix and enter the transmission, and is it even possible for them to make this judgement prior to pulling it apart?<p><br>
 

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Re: Conflicting Info - Tranny and axle issue (pirategirl)

I don't have an engineering diagram in front of me, but i would be VERY skepical about anythin Entering the transmission via the described path. <p>If the boot is cracked, water & dirt can get into the CV joint and wash teh grease out - leading to early failure of the bearings for the CV just like your mechanic suggested. I wouldn't worry about a catastrpohic failure though as the CV will get loud metal to metal noise that's likely worse in turns much before ultimate failure. It will fail, but likely with plenty of noisy warning...<p>Volvo recommends flush and refill of the transmission fluid at periodic intervals as part of normal maintenance. I don't have my manual open right now but you can check it out in your manual. Flushing with 2x to 3x the fluid capacity is pretty normal and just ensures that your wash away all the sludge and burnt fluid. <p>Perhaps the service manager simply communicated poorly and was trying to indicate that these 2 separate services were due and recommended doing both... I can't say much about pricing as the dealer service always seems too expensive to me.<p>PS - Both of these jobs a good mechanic, familiar with Volvo's can do. I wouldn't go to Jiffy Lube, but neither would I feel compelled to use the Volvo Dealer service the work for either.
 

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Impossilbe for the axle grease to make it into the tranny . <p>The axles are sealed so nothing gets in or gets out of them . <p>If the grease could get it ................ that means all your tranny fluid has leaked out. <p>Replace boot of CV joint and go <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> <p>Or replace axle in go. <p>These guys sound a bit shady at best.
 

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But since it is a T6 wich are know for crappy trannys I would at least have them do a Drain and fill of your tranny fluid 1 time now and again in 30k
 

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Re: Conflicting Info - Tranny and axle issue (pirategirl)

hi, the xc90 t6 left hand axle may fail internally and cause trans fluid to fill the axle and cause damage to the tran. the boot cracked has nothing to do with this, the cause is the left axle is fully hollow and at the trans side it has a metal plug spot welded in it fails and allows the trans fluid to enter the axle and grease to enter the trans. i have done many trans on xc90 and more than half of the time replace the left axle due to the plug being loose. the only repair would be to replace the axle and change the fluid and hope the trans is ok. u can verfy if trans fluid is in the axle by one if the boot is riped see if trans fluid is leaking out of the boot or if the grease is very water like instead of being thick or u could use a pick to remove the center cap and remove the axle bolt 14mm or 13mm if ever replaced before and move the axle back and forth to see oil coming out of the axle bolt hole.
 

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Re: Conflicting Info - Tranny and axle issue (vlvo-tech)

Thanks vlvo-tech. My T6 transaxle failure at about 40K miles was attributed to axle seal failure allowing trans fluid and axle grease to mix. Thanks to your post, now I finally understand what happened. It did not make sense to me until now.
 

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what kind of stupidity makes a hollow axle ? <p>that has to be the dumbest thing I have ever herd of . <p>serioulsy why ? there is absoulty no reasoning behind that . <p>I could see on a race car to save some weight but wow that is just flat out incompentence on vovlo right there.
 

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Re: (Chilled Man)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Chilled Man</b> »</i></TD></TR><TR><TD CLASS="quote">what kind of stupidity makes a hollow axle ? <p>that has to be the dumbest thing I have ever herd of . <p>serioulsy why ? there is absoulty no reasoning behind that . <p>I could see on a race car to save some weight but wow that is just flat out incompentence on vovlo right there. </TD></TR></TABLE><p>FWIW lots of ordinary passenger vehicles have hollow axles and/or propeller shafts. Suffice to say that as long as the cylindrical wall of the axle is thick and strong enough to resist failure from torsional forces there's no reason why it absolutely has to be a solid mass.
 

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yeah on some cheap POS car . <p>I have never seen that on a volvo ever. <p>Just shows with the new owners the cheapness is sneaking into volvo <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/frown.gif" BORDER="0">
 
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