DIY close ratio transaxle

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benski105
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DIY close ratio transaxle

Post by benski105 » Sat Sep 22, 2018 1:54 am

Hi, has anyone out there done the diy close ratio box as mentioned in Jim k’s V6 book?
I have a pile of spare transaxles but before I go ripping through them it would be great to hear from someone who has made a successful one.
Thoughts or suggestions welcome.
1962 Giulia Ti Race-car
1969 Giulia Super
1987 GTV6- new race project.
Eman911
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Re: DIY close ratio transaxle

Post by Eman911 » Mon Sep 24, 2018 6:44 pm

I built one using a Milano Gold box as a base, installed an LSD and Alfetta 3rd and 4th gears. The ratios were pretty good for our brand of racing, but I managed to bend the main shaft which resulted in 2 broken clutch housings. I have since swapped a set of 83 GTV6 gears into the box to keep the 4.10 and LSD. The ratios are nearly identical to the Alfetta gears except 5th (.78 as opposed to .83)
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75evo
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Re: DIY close ratio transaxle

Post by 75evo » Wed Sep 26, 2018 9:31 am

I had Alfa Parts Exchange build one for me. It's very good for slow turns, you accelerate really hard out of the turns for 2 gears. This combined with a 7000 rpm engine, and you can keep up with other much faster cars. For example, at Buttonwillow on one of the slower turns, I passed an E36 M3 (240 bhp USA version) like he was standing still and he accelerated first.
benski105
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Re: DIY close ratio transaxle

Post by benski105 » Tue Oct 16, 2018 11:06 pm

Thanks for the input. I’ll have to go through some spare gearboxes and see if I have the right ones.
1962 Giulia Ti Race-car
1969 Giulia Super
1987 GTV6- new race project.
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