940 gearbox swap

Myles18

Hi all, I have a dilemma.

I currently have a 93 940 which was a stock n/an auto which was turbo charged and manual swapped with a m46 4 speed over drive. The problem I have is the clutch is slipping so I’m going to have to get the clutch done, and possibly have to get the box rebuild because the gears are very clunky and I’m only running super low boost (5psi) and I’m looking and going up to about 8psi in the near future. Is it worth just doing the clutch and possible rebuild on the m46 box or is there, my preferred option, another Volvo gearbox that can easily be swapped in (5 speed) or a similar box that will swap into the 940 with relative ease.

thanks,

Myles

Located WA

Major Ledfoot

If you have 3 grand plus shipping money, there's an M90 gearbox and kit for sale, here on Oz Volvo, in Melbourne.

https://ozvolvo.org/d/29059-time-to-clear-the-shed-sale

It's born for the 940, it will handle the boost you plan, and it's an easier straight swap than a T5 conversion.

Rebuilding the M46 may require syncros and bearings, some of which are NLA.

jamesinc

M47 is the 5-speed version. The M46 can take 8psi. Can you expand on "the gears are clunky"?

ramrod

Once you spend what money it costs to replace the M46, clutch kit and labour, you’ve still got a weak from the factory M46.

If I were you, I’d leapfrog straight into a T5 or CD009 from a 350Z.

You want to upgrade things at the same time as replacing, especially if you plan more engine work (boost is addictive and too much of it will break the M46 again so you’ll be back where you started)

This all depends what you want to use the car for of course

nugget_940

ramrod You're looking at about 10k all up for a CD00* swap done properly with good parts.

Maybe a bit more, not sure how the exchange rate is looking at the moment.

ramrod

Maybe so. But it’s either do it right the first time, or keep betting on how long an m46 will last, sure if you have three of them as spare, but it’s not like you can just go to a store and get an m46 and get back on the road again in no time

Major Ledfoot

Price of a used / refurbed CD009 is close to a new TKX, AFAIK. CD009s in OZ aren't thick on the ground like in USA.

I sense OP has budget concerns, modest power goals, and ease of solution.

So I'd surmise (from easiest to hardest) -

Late M46 with P type OD is stronger than M47, but some M46/M47 components many be hard to find if doing a refurb.
M90 is stronger than both, but easy to install and next in line for expense.
T5 swap next most expensive and strength depends on what you're working with; more fabrication / mods required.
CD009 or TKX for strength, expense, and complexity of mods.

OP's choice.

Ex850R

A TB’er commented the other day he was dumping the CD900 for a T5 as it wasn’t a good ratio choice at all

nugget_940

Ex850R Theyre very short. Especially if youre swapping from auto 940 with a 4.10 rear gear