Hi all, I have a 1994 sti wagon (92/200) and the center diff has gone so was thinking of changing the whole gearbox and upgrading it. I have heard of people changing them to a RA one as these have close ratio. I will be passing this to a machanic to do so would just wanted some input on the following:

1) Good idea or not?
2) What box to go for (not silly money)
3) How long would it take (£££)

I dont really want to be paying loads of money and am not looking for loads of power, I was just told that it may work out better in the long run to do it this way or was I fed a load of sh**?
My gearbox code is i think TY752VB3CA and the ratio is 4.111 as just changed rear diff and drive shafts.
Thanks

 

Any TY754 box will be stronger and an easy fit. The best to go for would be from an STi5/6.
On a budget you could just replace the viscuous section which is on the rear of the gearbox and very easy.
Ensure you have the right viscuous or swap the drop gears. All Jap boxes are 1.0 : 1 UK boxes are 1.1 :1. For them the teeth count is 30:33 from memory. Without going out in the cold and dark to the garage, I think Japs are 31:31.

Strongest of all is a six speed but that is heavier, more expense, more complex to fit and may be overkill for your needs.

 

hi mate , i have had an RA scooby and the gearbox is fantastic, low ratio awesome acceleration but if you do alot of motorway miles forget it! optimum crusing speed is about 75 mph at 4000 ish rpm (usualy 70 mph equates to 3000 rpm)if you do over that it will sup some right fuel and to sit at 90 on the motorway at 5250 rpm is no good for the engine

 

it is better to replace the tranny and the rear diff together to get the correct match.

 

Just found out from the importer that this car has a lightweight flywheel on it so now im thinking that it could well be that and not the diff/gearbox as the noise only happens when I am off the gas and clutch! anyone know how I can find out?

 

If the noise only comes when your off the gas it could well be the flywheel! Changed my clutch (exedy) and put a lightweight one on, ever since its had a noise when decelerating, only happens at around 3000 rpm. Done a search and found out its a common thing with lightened flywheels!?

 

Yea i was reading a thread all about it the other day which has made me change my mind and it sounded exactly the same.