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> 4 speed tranny stuff for the V8 and high HP /6 crowd, Pictures
Dr Evil
post Feb 25 2008, 05:53 PM
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Here is the latest gearbox I am building for someone. It is an F-N-X-HBf box and I wanted to show how easy it is to lock out 1st in a 4 speed box. I have heard that there are people that charge a chunk of change to do the same thing....I think that is wrong as it is way easy. All you need is a rear gasket, tubing cutter and a section of 3/8" copper tubing (1/2" shown as I bought the wrong size).

Here is the FNXHBf stack (Ooo, purdy).
Attached Image

Here is the shift rod end for 1st that needs the sleeve to lock it out. I removed 1st gear completely other than the gear on the input shaft as you need it for reverse.
Attached Image

And here is the section of ~2" copper tubing. You need to keep the slider for revers. It looks like the sleeve will hit the slider, but it is just the angle of the pic. Attached Image
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Dr Evil
post Feb 25 2008, 05:54 PM
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This could easily be done by anyone with limited experience.
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So.Cal.914
post Feb 25 2008, 06:00 PM
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Cool Evil... (IMG:style_emoticons/default/smile.gif)
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dwillouby
post Feb 25 2008, 06:11 PM
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I did the same thing to mine. Also installed an H gearset and fliped the others.
Very easy procedure. These are so easy to work on why would anyone pay someone to do it for them? (IMG:style_emoticons/default/biggrin.gif)

David
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Trevorg7
post Feb 25 2008, 06:12 PM
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Is that the one we did at my place last month or another using the same method?

Cool stuff either way

T
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Dr Evil
post Feb 25 2008, 06:23 PM
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Nope, this is a different box.
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BIGKAT_83
post Feb 25 2008, 06:30 PM
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QUOTE(dwillouby @ Feb 25 2008, 07:11 PM) *

I did the same thing to mine. Also installed an H gearset and fliped the others.
Very easy procedure. These are so easy to work on why would anyone pay someone to do it for them? (IMG:style_emoticons/default/biggrin.gif)

David



I agree ............Really no trouble at all to flip the gears and install a H gear. I didn't bother with blocking off the first gear,just don't use it for anything.

Bob
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Dr Evil
post Feb 25 2008, 06:43 PM
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I was referring to the lockout modification as being easy and not worth paying big $$ for, I still understand when someone pays ME to do thier gearing and such.
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Dr Evil
post Feb 25 2008, 06:44 PM
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When you guys say that you flipped other gears, what combo do you like best?
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marks914
post Feb 25 2008, 07:35 PM
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When Brad Mayeur did mine, he said it was no big deal, I can see why now.
I have the F- flipV-flipN-flipH setup, can't complain so far. Been running over 400 HP through for a while now. Nothing like hitting 100 in 2nd.

Mark


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Dr Evil
post Feb 25 2008, 08:09 PM
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That seems like a tight grouping in the upper gears. Quite a bit of distance between 1 and 2 as well according to my chart.


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rick 918-S
post Feb 25 2008, 09:22 PM
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Hey nice rack! -Celette
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What tire size are you using in your charts? 245/50?
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Dr Evil
post Feb 25 2008, 09:29 PM
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Tire diameter of 25"
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Andyrew
post Feb 26 2008, 12:37 AM
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So based on this info, with a 26" tire, and a 7k rev limit... we could hit 60 in F gear? on a stock 901?

Dang, I am really short shifting.... Think of the 0-60 times... mid 3's!!
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Dr. Roger
post Feb 26 2008, 02:38 AM
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I think mine is a (1st gear delete) tight 1st, second, and third group. Then 4th is a big jump, a flipped H for freeway cruising.

Running errands has never been more fun. (IMG:style_emoticons/default/aktion035.gif)

Dr. Evil, I really like your ratio charts.

Is there a way to tell what gears I have by rotating the input shaft and counting rotations of the output shaft? or visa-versa? I'm curious what my 2 backup trans axles are running.
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Dr Evil
post Feb 26 2008, 08:23 AM
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QUOTE(Dr. Roger @ Feb 26 2008, 03:38 AM) *

I think mine is a (1st gear delete) tight 1st, second, and third group. Then 4th is a big jump, a flipped H for freeway cruising.

Running errands has never been more fun. (IMG:style_emoticons/default/aktion035.gif)

Dr. Evil, I really like your ratio charts.

Is there a way to tell what gears I have by rotating the input shaft and counting rotations of the output shaft? or visa-versa? I'm curious what my 2 backup trans axles are running.


I would imagine so. The ratio of turns of the input shaft to turns of the output flange will give you a ball park of what you have. I have never tried it, but it may be quite accurate. Give it a shot and post your results and we can figure it out.

the chart that I am using is from Carquips web site. I down loaded it and then I plug in the gears and save the chart. Any combos you want ot see, just let me know and I will post it.

You like the short 1-2-3 and a long drop to 4th? I was under the impression that with the F-N-X-HBf that it would be smoother as the shifting is the same from gear to gear. If the preference is for the shorter 1-3 then I should let my customer know so I can see if he still wants to buy the X gear from me to make the pattern I felt was best.
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Dr Evil
post Feb 26 2008, 08:24 AM
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QUOTE(Andyrew @ Feb 26 2008, 01:37 AM) *

So based on this info, with a 26" tire, and a 7k rev limit... we could hit 60 in F gear? on a stock 901?

Dang, I am really short shifting.... Think of the 0-60 times... mid 3's!!


25" wheels. With 26" wheels you will hit 70 faster, if you have the torque to pull it off.
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Dr Evil
post Feb 26 2008, 08:47 AM
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QUOTE(Dr Evil @ Feb 25 2008, 09:09 PM) *

That seems like a tight grouping in the upper gears. Quite a bit of distance between 1 and 2 as well according to my chart.


More thoughts. It also depends on your power plant as you all know I am sure. All V8s are not the same. The engine I am building the box for is 200+ hp and peters out at 4200 rpm. So the shift points you get with my set up in this box are about:
-1st shift at 4K gets you to 35mph and 2nd at about 2.3k
-2nd at 4k gets you 63 mph and 3rd at 2.9k
-3rd at 4k gets you 85mph and 4th at 3K
-4th at 4k gets you 115mph with room to go to 183 mph (theoretically)
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michaelt55
post Feb 26 2008, 09:04 AM
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Looks good to me Mike....


thanks..


Michael









QUOTE(Dr Evil @ Feb 26 2008, 08:47 AM) *

QUOTE(Dr Evil @ Feb 25 2008, 09:09 PM) *

That seems like a tight grouping in the upper gears. Quite a bit of distance between 1 and 2 as well according to my chart.


More thoughts. It also depends on your power plant as you all know I am sure. All V8s are not the same. The engine I am building the box for is 200+ hp and peters out at 4200 rpm. So the shift points you get with my set up in this box are about:
-1st shift at 4K gets you to 35mph and 2nd at about 2.3k
-2nd at 4k gets you 63 mph and 3rd at 2.9k
-3rd at 4k gets you 85mph and 4th at 3K
-4th at 4k gets you 115mph with room to go to 183 mph (theoretically)

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Andyrew
post Feb 26 2008, 07:53 PM
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QUOTE(Dr Evil @ Feb 26 2008, 06:24 AM) *

QUOTE(Andyrew @ Feb 26 2008, 01:37 AM) *

So based on this info, with a 26" tire, and a 7k rev limit... we could hit 60 in F gear? on a stock 901?

Dang, I am really short shifting.... Think of the 0-60 times... mid 3's!!


25" wheels. With 26" wheels you will hit 70 faster, if you have the torque to pull it off.



If we have the tq... is that a joke? (IMG:style_emoticons/default/biggrin.gif)
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