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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
In a 915 car a 76/7 930 short transmission is the easiest.

The other 4 spd 930 transmissions can be fitted to but it ether has to be shortened or the motor moved back I believe.

The gear drop with the 930 transmissions is about 2800rpm (at about 50mph) out of first and about 1800 on the later gears. They are geared for almost 200mph.

Many put a G50 5 speed from a 87-89 or 90-94. They have lower gears that a turbo and make for a fast street car. One builder highly recommends a reinforced side plate mod to keep them togeather.

I believe the NA 5 speeds are geared for up to about 160mph with rpm drop of about 2800 (at just under 40mph), 1900, 1350. 1350 rpm drops.

The grand daddy of turbo transmissions it the G50/50 five speed from the 91-93 turbo. First gear is tall and the gears are still a bit wide. 2nd through 5th can be changed but first is part of the main shaft so changing that is not easy. Keeping first and regearing this as a close ration box could be a lot of fun. Geared for up to almost 200mph.

Any of the G50's have to be shortened and or the torsion tube (78-89) modified to fit.

Not sure about the 6 speeds as this will typically require cutting the torsion tube center section our and doing some significant modification.

Not a transmission expert so I do not know the smaller details of any change overs.

Last edited by 911st; 03-06-2010 at 07:00 AM..
Old 03-05-2010, 05:53 AM
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