Tazio Posted June 18, 2023 Share Posted June 18, 2023 I have a Type 9 gearbox, with an SPC semi helical gearset in it, it works fine, no problems with gear selection up or down the box and it maybe just me, but it seems to be noisier than I remember in 3rd and 5th, especially so when coming down the box on a closed throttle. How noisy is yours??Alan Link to comment Share on other sites More sharing options...
7 wonders of the world Posted June 18, 2023 Share Posted June 18, 2023 there's some noise on mine but it's nothing compare to a SC gearset I had previously ..... when you say noiser than you remember....? is this an age thing..... you not the car .....assume yours has a 2.48 first, are you running a .82 or .87 fifth...?Mine is alloy cased so this will alter the frequency etcWhat oil are you running...? Link to comment Share on other sites More sharing options...
Tazio Posted June 18, 2023 Author Share Posted June 18, 2023 Neil,I've only done about 300 miles in it over the last 3 years, and been chasing a diff issue all that time. With a borrowed and quiet open diff now fitted it highlights the other driveline noises, probably been masked with my ear buds, but without those it just seems noisier in 3rd and 5th than I remember. Oil is Redline MTL, and yes to 2.48 first, as for 5th.....who knows, it;s in the paperwork somewhere.....Alan Link to comment Share on other sites More sharing options...
Mechanical Moz Posted June 19, 2023 Share Posted June 19, 2023 Noisy to the point of being unsuitable for road/touring use in my opinion, 2nd and 3rd especially. It's the dominant noise in the cockpit by a margin. I'm going to try some normal GL4 semi synth oil in it instead of MTL to see if that helps at all. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted June 19, 2023 Share Posted June 19, 2023 You need to get some throttle bodies - they drown everything out.... Link to comment Share on other sites More sharing options...
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