Engine to Gearbox compatibility

jury · Post by **jury** » Mon Apr 04, 2011 12:45 pm

Need some help please...

I have a 1970 2.2 911 T engine that has been rebuilt to E spec, engine number 6103113...and I have a gearbox that came with my 912 project car, type 902/01 (4 speed?) serial number 1080642

In layman's terms can they be fitted together and used? Is it adviseable?

If so what would be needed in terms of clutch, flywheel etc etc

Cheers
Chris

Lightweight_911 · Post by **Lightweight_911** » Mon Apr 04, 2011 1:52 pm

You could use the 4-speed 902/01 taransmission with your 2.2 engine - using the '65-'69 911 flywheel & 215mm clutch but I don't think it woud enable you to get the best out of your engine.

I'd go for a 5-speed transmission - rule of thumb is to use the flywheel/clutch assembly that goes with your chosen transmission:

901 gearbox with '65-'69 911 flywheel/215mm clutch
911 gearbox with '70-on 911 flywheel/ring gear/225mm clutch
915 gearbox with '70-on 911 flywheel/ring gear/225mm clutch

Also bear in mind that fitting a 915 transmission will require some 'tin bashing' at the rear of the tunnel to give clearance to the bulkier gearbox.

adam356 · Post by **adam356** » Mon Apr 04, 2011 3:35 pm

I have an early 911 gearbox that im going to sell if you get stuck!!

210bhp · Post by **210bhp** » Mon Apr 04, 2011 5:47 pm

Is it possible to convert that four speed box to a five speed?

Regards
Mike

jury · Post by **jury** » Mon Apr 04, 2011 7:05 pm

Lightweight_911 wrote:You could use the 4-speed 902/01 taransmission with your 2.2 engine - using the '65-'69 911 flywheel & 215mm clutch but I don't think it woud enable you to get the best out of your engine.

I'd go for a 5-speed transmission - rule of thumb is to use the flywheel/clutch assembly that goes with your chosen transmission:

901 gearbox with '65-'69 911 flywheel/215mm clutch
911 gearbox with '70-on 911 flywheel/ring gear/225mm clutch
915 gearbox with '70-on 911 flywheel/ring gear/225mm clutch

Also bear in mind that fitting a 915 transmission will require some 'tin bashing' at the rear of the tunnel to give clearance to the bulkier gearbox.

Thanks for that Andy, much appreciated

Chris

jury · Post by **jury** » Mon Apr 04, 2011 7:06 pm

210bhp wrote:Is it possible to convert that four speed box to a five speed?

Regards
Mike

Open to options at the moment Mike. What do you reckon?

Chris