V8 TF80-sc transmission rebuild using box from other model

Didjeridave · Jul 7th, 2023, 12:23

2008 V8 XC90 with physical damage to the transmission casing and internals on the left (wheel hub side). Hit a rock & one of the casing bolts got chewed up in the gears. Not inspected but quite sure the box is toast.

Getting a replacement V8-specific box is a nightmare. A few in germany but silly money and import (thanks Brexit sheep) and delivery bother.

Only issue I know of is the mounting bolt pattern to the engine is specific to the V8, but can anyone please suggest any reason why the engine-side part of the TF80 casing could not be used to enable fitting a box from any other model? I'd have the ECU for the V8. I can't find any difference between TF80s otherwise, even between makes, let alone models.

Cheers.

Tannaton · Jul 7th, 2023, 15:16

I think the final drive ratio is different on the V8. You might be able to fit one from a 3.2, but not a diesel.

Make sure you get a Gen1 for ECU compatibility, and of course with AWD.

Have a look on the Volvo XC90 Owners UK facebook group, someone in Scotland was breaking a V8 a few months back after theirs was written off.

EDIT: The gearbox final drive ratio is unique to the V8, here :

https://www.media.volvocars.com/uk/e...specifications

Jul 7th, 2023, 12:23	#1
Didjeridave New Member Last Online: Jan 30th, 2024 09:36 Join Date: Nov 2008 Location: Sheffield	V8 TF80-sc transmission rebuild using box from other model 2008 V8 XC90 with physical damage to the transmission casing and internals on the left (wheel hub side). Hit a rock & one of the casing bolts got chewed up in the gears. Not inspected but quite sure the box is toast. Getting a replacement V8-specific box is a nightmare. A few in germany but silly money and import (thanks Brexit sheep) and delivery bother. Only issue I know of is the mounting bolt pattern to the engine is specific to the V8, but can anyone please suggest any reason why the engine-side part of the TF80 casing could not be used to enable fitting a box from any other model? I'd have the ECU for the V8. I can't find any difference between TF80s otherwise, even between makes, let alone models. Cheers.

Jul 7th, 2023, 15:16	#2
Tannaton Bungling Amateur Last Online: Yesterday 23:04 Join Date: Aug 2014 Location: Beverley, East Yorks	I think the final drive ratio is different on the V8. You might be able to fit one from a 3.2, but not a diesel. Make sure you get a Gen1 for ECU compatibility, and of course with AWD. Have a look on the Volvo XC90 Owners UK facebook group, someone in Scotland was breaking a V8 a few months back after theirs was written off. EDIT: The gearbox final drive ratio is unique to the V8, here : https://www.media.volvocars.com/uk/e...specifications __________________ 2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135 Last edited by Tannaton; Jul 7th, 2023 at 15:27.

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