74 915 4 speed, can I add a 5th Gear

[matty74]

Howdy,

Can someone help me I have a 1974 911 with a 915 4 speed box.

I am getting the box rebuild from gears from another 915 box 5 speed 76 carrera.

I need to find out if my existing 4 speed will accomidate a 5th Gear?

I'm using the gear sets from the other box.

If not what do I need to accomidate the 5th Gear?

Matt

[Bill Verburg]

'76 C3 came w/ a 915/44 5spd, as long as you have all the internals they will transfer over to the '74 915/16 4spd.

[JV911SYDNEY]

g'day matt,

carlos in glebe rebuilt my box (for the previous owner)

was a 4 speed, now a 5 speed with lsd

not sure whats involved though

[matty74]

Carlos is doing mine, but I was just checking if the stock 4 speed would accomidate the 5th Gear, Carlos is not sure until he looks at the box which he will not have until tomorrow.

[JV911SYDNEY]

ah i see. let us know how you go

[Grady Clay]

Matt,

Is the ’76 5-speed Carrera with the oil pump? Regardless, why not use the 5-speed as is? Even if it needs servicing, there is less set-up compared to transferring the internals to your original 4-speed. I recommend you preserve your 4-speed unmolested and freshen the 5-speed.

Best,
Grady

[matty74]

the carrera diff case housing is cracked, the dif is shot so I want to used the parts to re-build my 4 speed as a 5 speed

[matty74]

Bill you answered one of my questions yet again thanks.

JV911SYDNEY I'll let you know once it's done.

Matt