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4:56 gears

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budryzer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote budryzer Quote  Post ReplyReply Direct Link To This Post Topic: 4:56 gears
    Posted: Jun/03/2014 at 7:17am
Greetings all,
Just an opinion question here.......
I'm running a recent 4:56 gear install.   Believe me,,,,,, It's fun as heck!!!
Of course I have no highway ability as I'm still running a refreshed M11b with a 3k stall customed from Hughs converters.

The only question I have is about my first gear. It really seems non existent. It uses it of course but it shifts to second while still under the launch. Maybe 10mph

My question is swapping to a 3:54.... Will I lose that wicked launch that I currently have? Will this little difference raise my first gear shift point up to around the 20mph mark?

It's a fair amount of work to do, so I don't want to be disappointed if I tune down my gearing.
Thanks
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 348AMX Quote  Post ReplyReply Direct Link To This Post Posted: Jun/03/2014 at 11:11am
Simple(assuming the trans is otherwise healthy); Don't leave it in D and instead shift manually. The M11 and M12 can be held in 1st and 2nd with the console shifter until you manually shift to the next gear. Leaving it in D it will always shift conservatively/early, that is how they were calibrated for the AMC's, but it gives you the best of both worlds.

It will shift out of 2nd by itself even if you DON'T move the shifter, and will do so at approx 5800 RPM to protect from over revving.....but you can hold 1st as long as you want...(6000 RPM for example)... and it will stay in 1st until you move the shifter to 2nd.

An auxiliary trans cooler mounted between the grill and radiator core support works wonders to keep these cool and healthy....the fan creates a low pressure area there and will pull air through the aux cooler and it will keep the trans fluid from getting hot. A MUST on an M11 especially with the gears and converter you have.

Edited by 348AMX - Jun/03/2014 at 11:17am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Snotty Quote  Post ReplyReply Direct Link To This Post Posted: Jun/03/2014 at 12:54pm
Of course your launch will be affected. Why not think about splitting the difference and going with a 3.90 gearset?
Son's car: '73 Gremlin X, 401, T-10, Mopar 8.75 rear with 3.23 sure grip. My car: '70 Newport Convertible, 440 automatic
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Post Options Post Options   Thanks (0) Thanks(0)   Quote budryzer Quote  Post ReplyReply Direct Link To This Post Posted: Jun/03/2014 at 3:16pm
Thanks for the responses. I'll play around some more with manual shifting it and determine where it actually tops out at in first. I think if I can get it up near 20 mph than my second and third will be longer. Tranny cooler is needed though, you're right. I think that should be my first to do...
1968AMX Stroked 369
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04 BMW 325
A/W 95 Ultralight Hobbycopter
85 CR500 x 2 and 13 other open Class Bikes
77 Hercules
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1970AMX390/4spSonicw/mask&3Gremm's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mytcar34 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/04/2014 at 10:09am
unless you are drag racing 4.56 gear may not be a good choice it depends on tire diameter also. your probably going to run out of rpm. If I were building a street/ strip car I would go with the 3.90 gear and your convertor would make a great combo.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 69amxrcr Quote  Post ReplyReply Direct Link To This Post Posted: Jun/04/2014 at 7:07pm
if you want to switch let me know I live in NJ and have both 3:54 and 3:90 gears in model 20 rears for 68-70 AMX's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote budryzer Quote  Post ReplyReply Direct Link To This Post Posted: Jun/05/2014 at 5:21am
Thanks, I have two right now and another carrier. I'd consider the 3:54 though. I'll PM you.
1968AMX Stroked 369
"UNCLE SAM" tribute
04 H2
04 BMW 325
A/W 95 Ultralight Hobbycopter
85 CR500 x 2 and 13 other open Class Bikes
77 Hercules
Chinook Flt Lead
Prev
1970AMX390/4spSonicw/mask&3Gremm's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gccarman Quote  Post ReplyReply Direct Link To This Post Posted: Jun/24/2014 at 11:03pm
your wicked launch will be gone, have your trans man work on the shift governor to change shift point, or put a manual valve body in it. use a bigger diameter tire for street,
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mytcar34 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/26/2014 at 9:34pm
How much motor are you running stock or modified? you can run the numbers if your red line is 6,000 tire diameter 28 inches and 4.56 gears you can figure your trap speed ,et and rpm in high gear. I usually set my car up to hit the red line about the quarter mile stripe. if your running eight mile then the 4.56 may be good.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/28/2014 at 10:14pm
i run 4:56 in my matador with 29 inch tall tire about 3500 on interstate  that is about 60-65 

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