HUNT3D Posted December 13, 2011 Share Posted December 13, 2011 I've decided not to buy a new engine for my 75' Hillman Hunter and have decided to work the original 1725cc but i need help on a gearbox...I haven't a clue of what (if any) 5 speed gearbox's can bolt straight on with no or not much work...Help or advice would be greatly appreciated Quote Link to comment Share on other sites More sharing options...
Beaver Posted December 13, 2011 Share Posted December 13, 2011 none will bolt straight on. 5 speed seirra gbox will probably be the easist but will still take a bit of work Quote Link to comment Share on other sites More sharing options...
MACKAZ Posted December 13, 2011 Share Posted December 13, 2011 there is an uber rare overdrive box for them made by Laycock. Quote Link to comment Share on other sites More sharing options...
HUNT3D Posted December 13, 2011 Author Share Posted December 13, 2011 What would have to be done to the driveshaft? i'm guessin the splines are not compatible? Quote Link to comment Share on other sites More sharing options...
Raizer Posted December 13, 2011 Share Posted December 13, 2011 Both driveshaft and clutch splines should be identical, think the drive shaft might even be the right length? Hardest bit would be the bellhousing and moving the shifter forwards. Avenger on here has had it done to one of his avengers so would be able to give you more advice regarding the bellhousing etc. Quote Link to comment Share on other sites More sharing options...
Avenga Posted December 13, 2011 Share Posted December 13, 2011 Both driveshaft and clutch splines should be identical, think the drive shaft might even be the right length?Hardest bit would be the bellhousing and moving the shifter forwards. Avenga on here has had it done to one of his avengers so would be able to give you more advice regarding the bellhousing etc. Yes, I have done a 5 speed conversion on my '75 Avenger. We have also done the same conversion on another member Avenger, with a few more in the pipeline. You can read about it over on the Avenger forum. I created a thread with heaps of photos of the process and info. http://www.avenger.co.nz/forum/index.php?topic=60.0 Avengers don't share the same gearbox or engine as the Hunter so I am not sure how similar the process will be but basically what we do with our Avengers is use an automatic Avenger bellhousing which is detachable (The Avenger manual has an integral bellhousing which would need cutting and welding i.e much more difficult to do) Once we have the auto bellhousing we then make an adapter plate which bolts the auto Avenger bellhousing up to the Ford Sierra gearbox. The spacing of the adapter means the drive shaft is now the correct length. All the splines on both ends are the same on the Avenger and you use the standard Avenger clutch etc, just need to make up the clutch pivot point and cut a clutch fork window. You also need to make a new gearbox mount and move the gear lever forward but photos of all that are on that post on the Avenger forum. Quote Link to comment Share on other sites More sharing options...
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