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<div style=3D"FONT-FAMILY: Arial; COLOR: rgb(0,0,0); FONT-SIZE: 12px"><div>=
spit and GT6 tranny are not directly swapable.... input shafts are differen=
t.... <br />swapping shafts would require swapping laygears, which requires=
swapping all gears.....<br />just go with the 3rail.<br />You CAN swap the=
shifter mechanisms...but not really worth the effort or trying to collect =
all the right parts.<br />Late Spit 1500 single rails came with a j-type o/=
d...doesn't 'bang' as hard shifting, uses lower currents to switch the sole=
noid, simpler wiring.<br />GT6 used a d-type. needs a relay and different w=
iring<br />I just ever so slightly slip my clutch on d-type o/d switch out =
...no big deal. FIS6 (Fuel Injected Spit6) is running around 136 hp<b=
r />http://www.teglerizer.com/triumphstuff/spit6whiteyFI/spit6whiteyFI_full=
engine1.html<br /><br />Has around 15K+ on it now, including 3 long r=
oad trips that included track laps (sissy laps but still drove the tracks a=
t speeds we weren't suppose to) <br />Now you CAN get j-type o/d shafts for=
the three rail....so you could install a j-type on your three rail GT6 tra=
nny...requires a full tear down though to swap shafts.<br /><br /><br />The=
3.27 diff and a non-o/d final drive ratio is nearly identical to the 3.89 =
rear and o/d switch on.<br />The 3.27 carrier is the weakest of all the dif=
fs (smallest carrier diameter...thinner walls carrying the ring gear)<br />=
Getting off the line in the GT6 with a 3.27 is sluggish. Hence the 3.89 and=
o/d.<br />There is a 3.63 avail, but matching a speedo is a pain (revs per=
mile errors) <br /></div><div> </div><div> </div><span>Paul Tegl=
er<br />ptegler@verizon.net<br />www.teglerizer.com</span><div> </div>=
<div style=3D"border-top:1px solid #bcbcbc;margin:5px 0px;"></div><span sty=
le=3D"font-size:12;font-family:arial;color:#000000;">On 02/27/15, <span>jmb=
s46@comcast.net</span> wrote:</span><div> </div><div style=3D"font-siz=
e:12;font-family:arial;color:#000000;"><div style=3D"font-family: Arial; fo=
nt-size: 12pt; color: #000000"><div>Hi folks.<br /></div><div> </div><=
div>I have a couple more questions on the GT6 I was hoping for some wisdom =
here.</div><div> </div><div>1- I have the choice of using a '73 '3 rai=
l' trans that came with the GT6 chassis or a '78 'Marina' trans from my '78=
Spitfire donor car. Any recommendations? I am planning on 'massaging' the =
2.0 liter inline 6 to about 130 HP or so. I understand both trannies are eq=
uivalent in handling engine power (apparently not very) :) </div><div>=
</div><div>2- I also understand the diffs are pretty much the same as=
far as power handling. I plan on getting and overdrive, so is the 3.89 rat=
io from the Spitfire is what the factory used in the US. But, apparently th=
e German GT6s with OD used the US non OD ratio, the 3:27, maybe that is bet=
ter for a more relaxed cruise? Not planning on drag racing much, but also d=
on't want a car that cant get out of its own way.</div></div><br /><hr size=
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