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Which Gearbox?

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Posted
Posted

ok im doin an rb30det conversion and wondering wether, if i can get my stock rb20det box rebuild and strengthened and would it be able to withstand the torque of the 3ltr engine or use an rb30et gearbox i know alot of people recomend using an rb25 box but there pretty pricey so if i can get ur opinions it will be much appreciated. or if anyone can point me in the direction of a cheap rb25det box or anyone willin to trade a complete rb20det engine for an rb25det box. cheers

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RellikZephyr Proficient

RellikZephyr

Posted
Posted

prob more depends on how much power and torque your making

just cause its a 3ltr instead of a 2ltr doesnt mean it needs a strong box

200-300kw R33 gtst box would handle it with a decent clutch

300+kw and lifelong reliability youll need either a dog box or straight cut gearset

but out of the standard boxes the R33 GTST RB25 gearbox is the strongest i believe

RellikZephyr

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Cubes Grand Master

Cubes

Posted
Posted

The R33 box behind a RWD RB30DET has absoltely no issues. 300rwkw is a walk in the park.

-------

I've had an rb20det gearbox much third gear with only ~180rwkw. However, the torque it was making at the wheels was the same as an r33 with 300rwkw (on the same dyno), obviously at a much lower rev.

BUT get a decent non thrashed rb20det box and it will last long enough to save your $$ for an rb25det gearbox. Hunt around they can be picked up for low $1000. Some wreckers charge like a wounded bull. One local wrecker here wants $900 for an rb20det gearbox when there going rate else where is $500!!!

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T04GTR Grand Master

T04GTR

Posted
Posted
only prob is r33 gtst box's are pricey

then dont do your car up then lol.

yeah there exxy but you dont really have much choice. if your thinking auto for drags its probably the way to go. but a "tricked up" auto (stock jatco) will be more dollars again.

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