I have a my99 uk car and want to know if my gearbox has 4 or 8 mounting points.

Damo

 

There's four bolts that hold the mount to the gearbox itself, then two studs to hold the mount to the cradle (which is in three parts) and then four bolts hold the cradle to the bodyshell.

 

so is that 8 mounting points? do the earlier gearboxes have 4 points? basically I have just bought an 1999 STI gearbox which has 8 mounting points will it fit?

Damo

 

Are you reffering to th 4 or 8 bolt bellhousing types ?

If so, if you look at the gearbox near the starter motor there is a label with a model code starting with either:

TY752 4 bolt

TY754 8 bolt

---john---

 

Yeah sorry the bell housing, the gearbox thats on at the moment starts TY754, so if the new one starts the same will it fit?

Damo

 

URGENT:

Will an 8 bolt gearbox casing fit to a 4 bolt engine?

Are the 754 boxes stronger than the 752 boxes?

Why did Subaru go to 8 bolt?..must have been for strength reasons??
Graham

 

YES

Apparently

**** knows

Steven

 

Graham

 

Graham,

it supposed to be the extra ribs in the case that make it stronger and less likely to flex, so meshing gears stay together, note the word supposed. I will find out in the coming weeks/ months

Andy

 

Excellent, thanks for your help,

All i need now is a diff, I know its a 4.444 ratio but will any 4.444 fit? of any year impreza? This The SPDA - Transmission Chart is great for advice but doesn't really help with the diff questions!!!!

Also what does R160/R180 mean?

Damo

 

Yes, any '160' 4:444 diff will fit, and the STi has a limited slip unit, the Sti RA has a more competition orientated LSD. The WRX one is 'open' diff.

The 160 diff is the most common by far.
It will mate to your driveshafts and hubs .

The '180' is the stronger unit found in the Type R and other more rare/competition type Imprezas. To fit the 180 you must have the matching driveshafts and rear hubs.

I think all UK turbo rear diffs are 3.99 ratio.

Graham.

 

Graham, all the rear diffs are a LSD of some type on scoobs, its just that wrx and uk cars use a viscous rather than plated.

 

OK, stand corrected. My Sti v3 is visc (I think) or doesn't work very well....hence plated diff going in this Xmas.
Graham.

 

Sounds good,

So how do you know if the diff is a "160" or "180"?

Damo

 

Also which is best for road use viscous or plated?

And does anyone know which version had which?

Don't ask for much do I?

 

Visc lsd are very smooth, almost as if it is not there at all. The plated ones with creek and clunk when turning at low speeds.
Visc units are maintenance free.

I do know Sti V3 has visc(my 97) and Sti RA are plated.

Graham