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Hi all,

Contemplating on getting my gearbox built. Currently as it stands, it’s a stage 4.25 MY19 Track Edition GTR, on a stock box (litchfield rods have been upgraded in the engine).

I don’t track my GTR at all (and probably won’t in the future). However, I’m looking at upgrading my gearbox so that it can withstand 900/1000bhp and about 800-1000lbft (for when I go for my turbo/engine build).

I know where to start for the engine and what to upgrade. However, I’m completely clueless for where to start with the gearbox.

Any advice on which component you would upgrade would be much appreciated for a fast road car (between 800lbft to 1000lbft). Don’t really want to go OTT (read as, don’t really want to spends £20k-£30k on building a gearbox for a car that I daily drive 8 miles round to school and back), so would like to know what the essentials are for that kind of torque level).

TIA! :)
 

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Your money does’nt go far here.

you’ll need a 1-6 gear set and a clutch as minimum and an inspection of the ets.
 

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Litchfield will charge just under 10k for a gearset with that power. I think SVM did mine with that power and theres a reciept for around 13k.

Whos doing your build ?
 

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There's different stages to upgrading the gearbox, some do the 1st gear, billet baskets, clutches and ets refresh and with good mapping can last (but it won't be over 700lbs). For 800lbs+ you'll need a fully built one, all gears, clutches, baskets, shift gear selectors etc.. The gearset are the biggest cost consumable, dodson, ppg,linney etc and then the noise is also different. If you want quiet (near oem levels), ppg is the best bet.

Speak with Chang, he's been building GTR gearboxes for ages and knows them inside out. Depending who is doing your engine build, some folks prefer one stop solution as its easier for any warranty/mapping etc.

What turbos are you looking to run? as that will ultimately decide if the 800+ levels of torque can be provided.
 

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Did’nt the early ppg gearkits suffer failure?
Yes, there is ppg v2, but doubt any early versions are available anymore.. as always, its best to speak to your tuner on which is available and preferred option for the power level you're going for.
 

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I have had PPG V3 in my car for several years now and it's been perfect, multiple launches etc without difficulty.

There is a noticeable whine in 4th gear, but as Tin has said, you get used to it.

Reliability at your planned power level comes at a price, gearbox upgrades are not cheap, but the thought of having a broken car with all the hassle that creates makes it a great investment.
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I've got the Linney Gearset , all gears themselves are bigger see attached (1st gear stock LEFT vs Linney HD RIGHT)

Noise 1st-3rd similar to stock, 4th a little whine, 5th whines a lot (tbh trade off strength vs stock failures its worth it! haha), 6th like stock and has a higher ratio for higher top speed, so cruise slightly lower [email protected] 70mph for example

Not had mine long yet, tho quite a few others have and they seem to be doing well at high powers.
 

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That's exactly how mine is 1 -3 quite,4th slight whine,5 th very noisy and 6 th quite.
Says on a receipt invoice motorsport gearset,so maybe similar to Linney ?
 

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There is a big difference between 800 and 1000 lbft. for a true 800+ you need the full gear kit. but other components push the price up at the 1000 lbft level.
 

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The main issue is the price of everything. There’s modified uprated parts readily available it’s a case of what you want to spend.
 

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At which point is there soo much torque you just end up wheel spinning through all gears? I heard anything over 750lb can be too much for the road.
can you have to much torque?
 

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So where do you need to be at 1000 lb/ft

1-6 gearset
output shaft
drop gears
4wd gears and clutch
complete clutch

Anything else?
 
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