Piero franchi Posted November 30, 2007 Share Posted November 30, 2007 Hi AllI have a GT6 mk1 with overdrive gearbox, I was considering fitting a stronger gearbox with out overdrive, and then fitting a diff from a 1500 to make up the gearing.would this work and what gearbox,es are a easy fit and stronger.wont be about for a day or so, but please keep posting your surgestions.many thanks Link to comment Share on other sites More sharing options...
thealligator Posted November 30, 2007 Share Posted November 30, 2007 Ford mk 9, 5 speed might do it Conversion plates are out there for Spitfire boxs to mk 9 ford Link to comment Share on other sites More sharing options...
AndreGT6 Posted November 30, 2007 Share Posted November 30, 2007 Yep, running a T9 in my GT6 Mk1 with a 411 diff.A. Link to comment Share on other sites More sharing options...
don cook1 Posted November 30, 2007 Share Posted November 30, 2007 Also ruinning a T9 in my GT6 Mk111 with a 3:63 diff.If you want to stay with 4 speeds then a higher geared diff will mean sluggish accelleration, although the 1500's 3:63 is a good compromise. I changed because i wanted a stronger box and I got it with the type 9. Have a look on Andre's website, he has all the information you need. You can do it on the cheap by buying the adaptor plate, spigot bush and clutch from Frontline. You might be able to adapt your overdrive mounting plate as it lines up...sort of. Unless the T9 gear lever extension isn't reduced you will have to move the hand-brake back. Andre has plenty of photos on his site but PM me if you want some more. Link to comment Share on other sites More sharing options...
thealligator Posted November 30, 2007 Share Posted November 30, 2007 The diff really depends on what you use or want the car for and the size of the wheels and tyre profile you are using. You have to do some maths as to mph per 1000 rpm, remembering that the figures floating are basted on 165/13" tyre's what ever where standard to the car not low profile 70's what ever Link to comment Share on other sites More sharing options...
AndreGT6 Posted November 30, 2007 Share Posted November 30, 2007 Yeah the 5 speed changed my GT6, if I ever have a chance to swap the diff to a 389 or something my cruising RPMs would drop by some 500RPM, still at 60MPH the car is going between 3000-3500 which is not bad.Your in the power band and can accelerate at will.One thing I will say is I am very happy I went with the shorter/mod shifter as show above in Don's message.Other wise my arm would be behind my seat when I'd go to shift, as it is now, PERFECT.The info...http://www.gt6.ca/5speed/index.htmlInstall is much like doing a OD install into a no-od car, but there a few points which I highlighted during my install.A. Link to comment Share on other sites More sharing options...
Piero franchi Posted December 2, 2007 Author Share Posted December 2, 2007 What would be the strongest Triumph G box I could fit??? Link to comment Share on other sites More sharing options...
AndreGT6 Posted December 2, 2007 Share Posted December 2, 2007 TR6?The reason I also opted for the conversion was OD kits are getting hard to come by!http://www.canleyclassics.com/welcome.asp?selectedtab=productupdate&article=stock.xml-Scroll down to the bottom of the page.So since a Tri 4 spd with OD was the same price as the 5 spd, it was a no brainer.A. Link to comment Share on other sites More sharing options...
Clive Posted December 2, 2007 Share Posted December 2, 2007 yep, any of the saloon/tr/sprint/stag gearboxes. Some need playing with! And avoid a type od. But then again you dont want od? however the od give few problems really. Link to comment Share on other sites More sharing options...
Piero franchi Posted December 2, 2007 Author Share Posted December 2, 2007 What are the weak parts to a Standard Gt6 mk1 box with overdrive???Thanks Link to comment Share on other sites More sharing options...
AndreGT6 Posted December 2, 2007 Share Posted December 2, 2007 Yeah nothing wrong with the 4spd and OD, specially if you take good care of the kit...(And not ignore a knock at high speed) Link to comment Share on other sites More sharing options...
CharlieB Posted December 2, 2007 Share Posted December 2, 2007 OUCH!! Link to comment Share on other sites More sharing options...
AndreGT6 Posted December 2, 2007 Share Posted December 2, 2007 Oh thats nothing hehe.http://www.gt6.ca/06/0904/index.htmlhttp://www.gt6.ca/06/0905/index.htmlThe GB lived and is stored for the future when I get sappy and want a stock GT6. Link to comment Share on other sites More sharing options...
CharlieB Posted December 2, 2007 Share Posted December 2, 2007 Did you figure out what caused it? (sorry you've probably said before) Link to comment Share on other sites More sharing options...
AndreGT6 Posted December 2, 2007 Share Posted December 2, 2007 UJ failure on the shaft, well I think a clip let go and caused the shaft to lock.The rear housing and bell took the load being the weaker metal on the transmission.A. Link to comment Share on other sites More sharing options...
CharlieB Posted December 2, 2007 Share Posted December 2, 2007 Brown trouser moment I expect !! Link to comment Share on other sites More sharing options...
AndreGT6 Posted December 2, 2007 Share Posted December 2, 2007 Yep, lots of noise, smoke and wheel lock... ;)But as I've said before I think the farmer I fly was more scared.I will say this, I got very lucky. I was able to keep the car under control, got out of gear right away because with the bell housing cracked I lost my clutch slave, never found the pin.Also lucky no fluids poured onto the wheels, it would have been game over.A. Link to comment Share on other sites More sharing options...
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