DuttonOwners

Dutton Kit Cars and their owners

im looking at possible options for a 5 speed box to fit in my leggera over the winter i could go for the type 9 box but they are getting pricey these days and i would have to change/do some chassis mods to get it in there .so i was thinkin mx5 or rx8 i believe these are both rwd boxes but im not sure of size in comparison to the type 9  also the prop could be an issue if they are different splines .any one with experience on this ??? your advice would be appreciated 

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Comment by Steve Kerswell on July 24, 2018 at 10:25

Hi James, I did the Pinto to MT75 conversion. From a 1300 crossflow. So yes a lot had to be done. New engine mounts. New gearbox crossmember and rubber mount. Plus the prop needed a lot of thinking about. Dave Price has been using a RX8 box, look up his build. You could get mean and use the engine and box from an RX8 !! Some think they are poor engines but its the person who looks after them who is at fault in my eyes. Good luck with your build, keep us informed.

Comment by James paton on July 23, 2018 at 20:47

cheers steve  im told you have done this conversion was there much to change on the frame or the tub ?? the box looks a bit rounder at the gearstick end 

Comment by Steve Kerswell on July 23, 2018 at 14:51

Hi James, there is a guy called Lee Butcher who makes a very comprehensive kit to join the box to the engine and using the cable clutch. A friend has used him and got good service, at a good price. He is trading on Facebook now

Comment by James paton on July 22, 2018 at 20:33

i will be changing the box over the winter months but will keep you guys posted just trying to gather info at the moment seem fairly straight forward though

Comment by James Doulton on July 22, 2018 at 20:19

I would be interested to see how you get on with the 6 speed because it sounds like a good conversion. There was some talk on here a few months back suggesting that the MX-5 5 speed might be better on the basis of the ratios being a bit better. I think that the 5 speed might also be more plentiful and cheaper. I think it was that the top ratio is slightly taller in the 5 speed and first is rather too low in the 6 speed - Dutton's don't usually want a lower first gear. I guess that either would be good, and 6 sounds better than 5 but I don't know how much difference it makes.

For Reference the ratios are:

5 Speed: 3.136, 1.888, 1.33, 1, 0.814

6 Speed: 3.76, 2.269, 1.646, 1.187, 1, 0.843

Comment by James paton on July 22, 2018 at 16:15

 yep the 6 speed sounds like a better choice daryl  was at a show today and was speaking to a guy who had a 6 speed in his escort  so have a bit better understanding on how its done

Comment by Daryl Heasman on July 22, 2018 at 12:29

Go for a 6 speed box James 

Comment by James paton on July 21, 2018 at 23:30

thanks adrian  , mt75 gearboxes are getting expensive now as well as the type 9 every one seems to be  useing them been doing some research and the rx8 gearbox is the exact same length as the type 9  the splines are the same and uses the type 9 clutch thrust etc  no diffrence with the 6 speed or 5 speed still would need to make up brackets to mount it and if you want to keep the cable more brackets but soo much cheeper than the ford units comes with a quick shift as standard aswell 

Comment by Adrian Southgate on July 19, 2018 at 7:10

The MT75 is also worth considering as it bolts straight onto the pinto, Steve Kerswell has done it. 

I know that the type 9 will require a new section cut and shut under the tunnel area, in fact anything other than a type 2 or type 3 box will require modifications to be made.

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