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Guys you can get a ford 9 inch irs diff. And i will need 5.8 and 6.1 gears becouse i am runnig a bert gear box so i will be runnig in top gear not 2nd or 3rd it is alot cheaper in speedway to go bert gear box then buy a really good light fly wheel and clutch and then keep replaceing gear boxs as you blow them

Edited by kris 44

one of the nissan vans runs an r200 with a high ratio (serena? espace?), there was a thread recently. It was about 4.9 I think.

Or maybe a custom pinion gear with the right ratio?

r200 is a very strong diff, and if you did actually have trouble with it (unlikely on dirt) there is always r220 out of 300zx that would fit.

Of course you can put a 9" in it, anything can be done with enough time and money, and sometimes it's worth it for reliability in a specific purpose.....not sure if there would be many IRS speedway cars out there?

How much power? Have you considered a hq 3 speed box? top gear is 1:1, they are cheap, lots of guys at home put them on the back of 350chevs in saloons in nz.

We ran a 6.5 9inch then went to a 7!!! it was like a worm gear!

Plus you can get the 9 inch head with an alloy nose and carrier to save a bit of weight.

  • 9 years later...
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