I am looking into putting a manual transmission into my T5R, This may sound borderline insane but has anyone ever looked into retrofitting a Volvo S60R 6 speed transmission into an 850. Im not looking to use the AWD output on it just use it like a FWD 6 speed in an 850.

 

It has been done.
people on Volvo speed have done it already.
If I blow mine I plan on upgrading to the 6 speed tranny.

 

Ughh! thats so good to hear, I thought it would have been a little too off the wall for most volvo owners, Ill check it out :
One more thing what about cost effectiveness? would the performance gains of the 6speed in my R be more cost effective in relation to the cost of using a 5speed?

 

i think you would gain a lot more of a "wow thats friggin cool" effect than you would performance effect. Sure you can stay in power band better with a 6 speed, but you're also shifting more often.

 

cost effectiveness of the performance gains? lol. Now there's two words that you don't hear together in the same sentence very often. You'll be doing a lot more work swapping in the M66 because it's not a direct swap like the M56 and will cost you a lot more. Especially getting the transmission. You're looking at a 5 year old transmission compared to a 15 year old transmission, and unless you have an extremely built up 850, I don't know what the gains would be of the M66 besides the fun factor.

 

Yeah it would be fun and pretty cool lol, I guess if I can come across one its worth a shot. One more thing I forgot to ask was if anybody thinks that the fuel efficiency will increase with the extra gear? I have been getting around 25-28 highway with my 850R which is about the same as the S60R, just not sure wether the gearbox will make a difference.

 

Well I did a little more research on the trans differences and it turns out that the final gear in the 6 speed is the same as the 5 speed so that would explain the similar fuel efficiency ratings between the two cars, I guess the 6 speed is just one more gear to shift