orbix

If I wanted to upgrade the gearbox in my 95 wrx, what are my options?

Would a gearbox from say a v5 sti fit? and be able take 380-400hp or would i need my current one rebuilt with stronger internals?

172sport

iTrader: (6)

You can fit a TY755VN1AA, Which goes straight in and has an oil cooler as std.

Its the same type casing and stronger internals as the V5/6 boxes.

Quite cheap to buy too, compared to the type r's boxes.

But at the power levels you talk about I reckon its 6 speed or PPG etc.

orbix

Really

How much are we talking for PPG?

172sport

iTrader: (6)

Telephone numbers, lol

mickywrx

iTrader: (29)

Must be short telephone numbers.

Had the above box in mine about 2 years now, except it's a TY754VN1AA. Mines a UK box with my jap diffs.

Block needs tapped for a starter bolt though, IIRC.

Tidgy

dont be fooled neither of the 5 speeders are that much stromger than the other.

options are pretty simple

6 speed 2.5k ish for a decent rebuilt box
5 speed ppg straight cut 3.5k new build

be ware of second hand box's you neevr know how they've been treated, also some folks dont get on with the shorter ratios in the 6 speeder

orbix

How much

Tidgy

lol, now you know the phones comment lol

mine was 3k but that was 2 yeasr ago and the kits have gone up in price since then

bigsinky

Agreed. i put a six speeder in my 95 wrx only to find that the old half shafts where not up to the torque when it was tuned. sheared a rear half shaft in jurby (IOM). ended up puting the whole drive train in. new STi7 half shafts, hubs and brakes. my six speeder is coping comfortably with the power levels i have now.

t7srt

iTrader: (2)

The other option is a box from an 04 plate WRX, you would need the diff and driveshafts aswell though, They are known to hold 400bhp and have a longer third,,

you could probabally do the whole lot for around £700

Mine is a uk car so the box with front modified shafts dropped straight in,

RB5 Boyo

Got a 6 speed box and all the bits for my RB5 recently for £1600 all in. The box was out of an 04 sti with 42k miles on it as well Some of them can reach up to and above £2000 though at the minute, just shop around the breakers or keep an eye on fleabay

Best mod i have done so far, takes a bit of getting used to but much better than the 5 speed and at least now when i go for big power i will have no gearbox worries

slasherkill

iTrader: (2)

I have the exact same problem as you. Looks like most people reccomend 6 speed. But that changes the gearratios too much.

Tidgy

only if your very lucky, none of the standard 5 speed box's are particularly strong.

orbix

With my car as old as it is and the prices of these gearboxes, I think I'll buy an newer impreza which is already at the power level i want.

bigsinky

but you will only want to upgrade the power in a newer model as well. very slippery slope mate. i have been there, and trust me, you need deep pockets if you want to mod your car seriously. the gearbox will only be the beginning. you have already seen the downside of producing more power, more bits break or some components are not up to scratch and can't physically produce more power. the quest for power is only limited by how much you want to spend.

bigsinky

in a standard car they don't vary that much. in a type r, well, that's a different matter, the ratios are quite short.

Tidgy

there vary enough to make a difference, mate had a classic sti, then a hawk eye, then a type r and now gone to a classic with a p1 box (although ppg going in soon). he hated the 6 speeders and the type r box, way to short ratio's for his liking

bigsinky

i neve really got used to my 5 speeder as it wasn't in that long before i changed to 6 spd. having said that, i am well into 5th crossing the 1/4 mile line

Tidgy

lol, i think it depends what your using it for, mate wasn't dragging it, more fast road so few gearchanges prob make it more enjoyable, also prob means certian speed arn't gearchange teritory

orbix

I haven't got the modification bug to bad as my car has been the same level power for the last 2 1/2 years.

But there must be some benefits in buying a car already at a high power level as you know its all been tested and any faults fixed.....hopefully.

Arch

iTrader: (59)

The 04 WRX box will be a TY754VN4AA or 5AA which is not the uprated one which requires the male shafts it is out of a late 05 WRX and is TY754VN6AA these have been found to be able to handle up to around 400bhp/400 Lbs Ft. The casings are completely different to the other 754 boxes and are significantly wider around the driveshaft outputs. I have not seen a gearset out of the box but the box has been redesigned and I can only assume the reason these are holding higher torque levels is due to them being designed to cope with the extra power of the 2.5 WRX's.
I used a TY754VN5AA out of a 04 WRX last year running around 330bhp and similar torque. This was used in a stripped out RA using sticky tyres for a whole hillclimb and sprint season. It was launched off the line a couple of times

I have compared the 752 gearsets to the 754 gearset in the 5AA box and the 5AA gears are bigger

bigsinky

and had the ballix thrashed out of it. unless you have a lot of paperwork about the work that has been done on the car i would tend to avoid. having said that if the modifications have been done by a tried and test company (people IMHO tend to stick with companies that do a good job) then i would say go for it. you are not guaranteed anything and it is your responsibility to ensure you are happy with the car before purchase. remember caveat emptor.

orbix

I'm confused

Which gearbox is stronger?

slasherkill

iTrader: (2)

My car is a STi Type RA So that is pretty short!

Arch

iTrader: (59)

The TY754VN6AA seem to be the strongest of the 5 speed boxes.
The TY754VN5AA/4AA from what I have seen and experienced would be next in line after that any TY754 then you are into the TY752 boxes.