[Amc-list] AX15?

["John Elle" <johnelle@xxxxxxxxx>]

I am some what confused over the interest in the AX-15 transmission
and it's various permutations. 
Snip 
 " The '97 - '99 2wd AX15 is the one to look for - High Output version -
 " larger input shaft with other improvements.
 "
 " This would be *sweet* behind a 360 set up for crusin' in a light car!
 
1st  3.83:1
2nd  2.33:1
3rd  1.44:1
4th  1.00:1
5th  0.79:1
 
This is a light duty transmission available behind some 4.2 and 4.0
engines.
Snip
 
VS 
Mustang
1st         3.35           28      (C)                       32   (D)
2nd        1.98           48                                  54
3rd         1.34          71                                  80.5
4th         1.00          95                                  107
5th         .76            125                                143
With C being the speed in gear with a 3.54:1 Rear Axle 
and D being the speed in gear with a 3.15:1 Rear Axle.
The speed is calculated using  4500 rpm w/P205-70-R14 Tires 
 
Both transmissions are wide ratio 4 speeds with a deep overdrive
and are designed to be used with vehicles tall final drives in the 
high twos and low threes. 
That is why the first two gears are so short. It is to enable 
some one to get away from a dead stop quickly but give an
economical cruising rpm. 
A compromise, but one that works. If either of these transmissions
are installed in a car with short final drives such as an OEM 3.54:1 
as used in the early Javelins and AMX's the transmission would act
like a truck transmission with a Granny low and a wide ratio 3 speed 
with a deep overdrive. Hardly my idea of what I want on a street 
car. 
However if starting in second all the time is your bag, that works, 
it just seems like a waste of a good 5 speed. 
What does it take to put an AX-15 in an AMC car? Is it satisfactory
when done? Does the speedometer work?  I have read that in order
to get something accomplished you have to take 2 or three permutations
and assemble one that will function supposedly correctly. What is 
the point if I have to buy 3 transmissions. And what happens if the 2 or

3 you buy have parts that don't interchange. What is the point in 
buying a Toyota Truck transmission so you can get better gearing
if the parts won't fit in the jeep transmission. 
I'm not saying that they don't or won't but no one has indicated that 
they will. 
I  have already installed one Mustang Transmission and have driven 
it behind a cooking version of a 390 for about 15 years now and 
really have no complaints. 
If I had the money and the inclination there are gear sets that would 
enable me to change the gear ratio of 1st and 2nd to give me a closer 
to a close ratio 4 speed with a deep over drive which would have 
done 2 things. Let me keep the 3.54:1 rear axle with out changing 
it and strengthened the transmission to specifications approaching 
those of a T-10. 
I am in the process of collecting parts for another Mustang conversion
for either a 360 I am working on or to install behind my fuel injected 
I-6. If I get a later transmission than what is in my Javelin I might 
possibly switch it out and use it instead and install the newer 
transmission in my Javelin. I might even rebuild the transmission 
and change the ratios of 1st and 2nd to gain a strength benefit. 
But as of the moment, nothing I have read on the AX-15 even 
remotely interests me in going that route unless I have missed 
something important. 
Now if I really intended to abuse a 5 speed with a 400+ horsepower 
engine I might be inclined to obtain a 150T bell housing and install
a (Mustang application) Tremec which definitely would take the abuse. 
'specially if I have to buy 3  AX-15 transmissions to make one. Just
order 
a Tremec to specifications and call it good to go. It would probably
be cheaper in the long run. 
O.K., what am I missing? 
John
 
 
 
 
 
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