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Can't find trans leak in bell housing

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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rsc555
Posts: 1
Joined: 8 March 2026
Year and Model: 1999
Location: Georgia

Can't find trans leak in bell housing

Post by rsc555 »

We have taken out this transmission 4 times now. New seal, rebuilt torque converter, new oring. Can't find any cracks. Where else could it be leaking from?
Very frustrated.

scot850
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Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
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Post by scot850 »

Have you checked the rear main seal for the engine?

If you are able to post where you see the oil and any traces from higher up we might be able to give more options. What variant of Volvo do you have? V/S/C70, S80, V70XC? Turbo or none turbo (NA).

Neil.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

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Grantkat
Posts: 176
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Year and Model: 1999 s70 GLT
Location: Ohio
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Post by Grantkat »

RSC555,

I have experience in transmission rebuilds, however I have not rebuilt a volvo xmission. for anything specific we would need the following:
the model, specific engine and transmission in your vehicle.
basics/general:
what color is the fluid leaking? making sure its actually transmission fluid leaking
if you did a rebuild - did you use transmssion assembly grease to assemble it? transmission assembly grease is often a light red grease that dissolves after you begin to operate the rebuilt transmission. It designed basically to dissolve and often leaks out as a result. The grease instructions often warn that you may see this on a rebuild.

You mention a new seal and new O-ring. here is a general synopsis of leak causes:
There are 2 common failure points that may result in a leak:
The front pump seal (torque converter seal) and input shaft seal. The other is a cracked torque converter neck which you indicate you do not have.

short of knowing the specifics here are things I have seen or experienced:
make sure your seal(s) are seated correctly. Also not sure about volvo however some seals have an orientation. they must go in with a certain side facing in or out.
When you remove and inspect look for signs of a seal not correctly seating. This is typically looking like a divit in the seal, a crease, or a high or low spot as compared to the rest of the seal. The other sign is when you see spot where the seal is "flatter" as compared to the rest, which would be a sign of a pinch as opposed to a seating of the seal.
make sure the metal around the seal is intact, a dent or small notch along the surfaces in proximity to the seal can cause a leak.
1999 S70 GLT ~193k
2014D VIDA/DICE
2007 Jeep Wrangler Unlimited ~ 315K
2008 Lincoln MKX ~130k
2008 Toyota Sequoia ~ 252k

Powered by coffee, stripped bolts, and questionable decisions.

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