how strong are M58's

**p fandango** · Saturday 19th April 2014, 20:35

as the title really. I've seen many AWD S/V70R's with the props removed running as FWD. What part is it that causes them to go, is it the collar from the transfer box

also can the M58 be ran the over way & just rwd, & would it need the transfer box if you wanted to run it as RWD

**Dangerous Dave** · Saturday 19th April 2014, 20:40

The gearboxes are the same as the M56 but with an extra output attached to the diff. The main failures are usually the connecting sleeve wears or the angle gear breaks.

**Harvey** · Saturday 19th April 2014, 20:40

Originally Posted by p fandango

as the title really. I've seen many AWD S/V70R's with the props removed running as FWD. What part is it that causes them to go, is it the collar from the transfer box

also can the M58 be ran the over way & just rwd, & would it need the transfer box if you wanted to run it as RWD

I would say no to running as RWD only as the rear is only designed handle 50% of the power maximum from the engine.

**Dangerous Dave** · Saturday 19th April 2014, 20:44

I don't think the rear would have a problem running the power as the diff is from a 900 series. You would have to remove the viscous coupling or Haldex unit to run full power to the rear. The big problem would be all the power has to run through the connecting sleeve which is a serious weak point. Youd have to find a way of welding the whole thing together for reliability.

**stribo** · Saturday 19th April 2014, 20:47

As Harvey's said the prop, and rear diff isn't designed for that much power, also Ford tried the same sort of thing with the MKI Mondeo when they were looking at going back into touring cars, but found the transmission losses to be too great to make it workable/competitive. So if you did beef up the propshaft, and rear diff, you'd still have the same transmission loss as a AWD car.

**oblark** · Saturday 19th April 2014, 20:59

The volvo AWD syatem is mainly FWD with RWD assitants.

**p fandango** · Saturday 19th April 2014, 21:20

i keep thinking of a RWD 850, turn the engine & M90 has got to be the strongest/most reliable way really

**stribo** · Saturday 19th April 2014, 21:23

Originally Posted by p fandango

i keep thinking of a RWD 850, turn the engine & M90 has got to be the strongest/most reliable way really

It's the only way to have a RWD car mate, and if you're honest, you already know that.

**p fandango** · Saturday 19th April 2014, 21:39

Originally Posted by stribo

It's the only way to have a RWD car mate, and if you're honest, you already know that.

the problem is i like the ratio's i've got in my M56. Going to an M58 means they "might" of swopped over, but i doubt they will into an M90 so means still with the stock ratios

**stribo** · Saturday 19th April 2014, 21:45

Originally Posted by p fandango

the problem is i like the ratio's i've got in my M56. Going to an M58 means they "might" of swopped over, but i doubt they will into an M90 so means still with the stock ratios

Smithy's the man to speak to about M90 'box ratios, I'm sure there's more than one set available for that box.

**p fandango** · Saturday 19th April 2014, 21:49

Originally Posted by stribo

Smithy's the man to speak to about M90 'box ratios, I'm sure there's more than one set available for that box.

i think most just change the final drive ratio by changing the rear diff. I guess i should finish her off in FWD first lol

**Rudeyboy18** · Saturday 19th April 2014, 22:03

I have a reconned M58 and angle gear on my car that im breaking. Blew the originals ,Replaced them along with clutch, then forked out 650 for a custom prop only to find my rear diff was shagged so i removed it. Im breaking the whole car now if thats any use to you

**p fandango** · Saturday 19th April 2014, 22:07

Originally Posted by Rudeyboy18

I have a reconned M58 and angle gear on my car that im breaking. Blew the originals ,Replaced them along with clutch, then forked out 650 for a custom prop only to find my rear diff was shagged so i removed it. Im breaking the whole car now if thats any use to you

every AWD i see being broke i always wonder how much they want for the rear axle assembly, but tbh i must just get her finished as she is before i start the task of converting to RWD

**Rudeyboy18** · Saturday 19th April 2014, 22:10

Well when i come to scrap the shell, you are welcome to come and collect the shell with rear axle , suspension etc etc if you want. For scrap value.

**p fandango** · Saturday 19th April 2014, 22:25

Originally Posted by Rudeyboy18

Well when i come to scrap the shell, you are welcome to come and collect the shell with rear axle , suspension etc etc if you want. For scrap value.

many thanks for the offer, but i really haven't got the time or space to do it

**Dangerous Dave** · Saturday 19th April 2014, 23:05

It can't be all bad news can it? The prop on the AWD is a shortened design from the 900 series.

**p fandango** · Sunday 20th April 2014, 03:51

Originally Posted by Dangerous Dave

It can't be all bad news can it? The prop on the AWD is a shortened design from the 900 series.

i think it'd be quite easy to get a full length prop made to remove the torque tube, but as someone pointed out i think there will be extra power losses with it being a transverse engine & when it finally gets out of the M58

**Dangerous Dave** · Sunday 20th April 2014, 09:28

Originally Posted by p fandango

i think it'd be quite easy to get a full length prop made to remove the torque tube, but as someone pointed out i think there will be extra power losses with it being a transverse engine & when it finally gets out of the M58

True, all the different gears the power has to go through will sap the power