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3.23 and 727 speedo gear #563222
12/26/09 01:30 PM 12/26/09 01:30 PM
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roy2345 Offline OP
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I replaced my 2.76 gear with a 3.23 gear and now I need the correct speedo gear to go in the tranny. Right now it's 20 mph off. I don't totally understand the formulas etc. Just would like to know what would be standard gear from factory setup for a 70 Road Runner Auto with 3.23 gear and 727 tranny. Thanks!

Re: 3.23 and 727 speedo gear [Re: roy2345] #563223
12/26/09 01:40 PM 12/26/09 01:40 PM
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Chilliwack B.C. Canada
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RUNCHARGER Offline
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32 will get you close depending on your tire size.

Sheldon
Re: 3.23 and 727 speedo gear [Re: RUNCHARGER] #563224
12/26/09 01:45 PM 12/26/09 01:45 PM
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1_WILD_RT Offline
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Rather than a formula how about a chart...

http://www.yearone.com/yodnn/tech/TechFA...15/Default.aspx
Re: 3.23 and 727 speedo gear [Re: RUNCHARGER] #563225
12/26/09 01:45 PM 12/26/09 01:45 PM
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roy2345 Offline OP
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ok..where do I get it at the BEST price?

Re: 3.23 and 727 speedo gear [Re: roy2345] #563226
12/26/09 01:53 PM 12/26/09 01:53 PM
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Re: 3.23 and 727 speedo gear [Re: 1_WILD_RT] #563227
12/26/09 03:14 PM 12/26/09 03:14 PM
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Grand Prairie,Texas
stumpy Offline
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Did you get the noise figured out? That's the first thing I'd worry about.
Re: 3.23 and 727 speedo gear [Re: stumpy] #563228
12/26/09 03:43 PM 12/26/09 03:43 PM
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roy2345 Offline OP
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yeah, dude tore it back down and adjusted something inside. Works like a champ. I just would like the speedo more accurate

Re: 3.23 and 727 speedo gear [Re: RUNCHARGER] #563229
12/26/09 03:51 PM 12/26/09 03:51 PM
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roy2345 Offline OP
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Will 33 read too slow? If so I believe I'll order the 32....I have 17"x 8" wheels with 235 60 17 tires

Re: 3.23 and 727 speedo gear [Re: stumpy] #563230
12/26/09 03:59 PM 12/26/09 03:59 PM
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Tire should be 28.3 tall use a 30 tooth gear...

BTW are you aware of how to "clock the gear adapter"...
Re: 3.23 and 727 speedo gear [Re: 1_WILD_RT] #563231
12/26/09 04:06 PM 12/26/09 04:06 PM
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roy2345 Offline OP
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no clue about clocking an adapter..I just can't screw it in?
Re: 3.23 and 727 speedo gear [Re: roy2345] #563232
12/26/09 04:11 PM 12/26/09 04:11 PM
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If you look at the picture I posted you'll see segments are marked for gear tooth numbers... select the proper segment & align it with the 6 o'clock position & bolt the adapter in...
Re: 3.23 and 727 speedo gear [Re: roy2345] #563233
12/26/09 04:13 PM 12/26/09 04:13 PM
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Clocking is easy.

It isn't very clear in that pic but under the arrow at the 6'oclock position there is a dot cast into the extension housing. That dot roughly lines up with the numbers that represent your gear.

i.e. if you have a #30 gear line the numbers 26-31 on the adapter to the dot.

Install the clamp with the tabs in the slots and your done.
Re: 3.23 and 727 speedo gear [Re: IMGTX] #563234
12/26/09 04:17 PM 12/26/09 04:17 PM
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MOP...=item414ba7e5c1 is what i ordered. Is this clocking device already on the tranny?
Re: 3.23 and 727 speedo gear [Re: IMGTX] #563235
12/26/09 04:18 PM 12/26/09 04:18 PM
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Quote:

Clocking is easy.

It isn't very clear in that pic but under the arrow at the 6'oclock position there is a dot cast into the extension housing. That dot roughly lines up with the numbers that represent your gear.

i.e. if you have a #30 gear line the numbers 26-31 on the adapter to the dot.

Install the clamp with the tabs in the slots and your done.



I agree it is easy... But not knowing about it would be bad...
Re: 3.23 and 727 speedo gear [Re: roy2345] #563236
12/26/09 04:20 PM 12/26/09 04:20 PM
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Quote:

MOP...=item414ba7e5c1 is what i ordered. Is this clocking device already on the tranny?



care to clarify...
Re: 3.23 and 727 speedo gear [Re: 1_WILD_RT] #563237
12/26/09 04:23 PM 12/26/09 04:23 PM
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roy2345 Offline OP
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i thought all i needed to do was put a different numbered gear in the tranny into that housing. will my tranny have that adjustable dial on it?
Re: 3.23 and 727 speedo gear [Re: roy2345] #563238
12/26/09 04:25 PM 12/26/09 04:25 PM
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The adapter is adjustable, the hole where the gear passes through is offset... Look at the picture above...
Re: 3.23 and 727 speedo gear [Re: roy2345] #563239
12/26/09 04:34 PM 12/26/09 04:34 PM
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Valencia, España
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Quote:

i thought all i needed to do was put a different numbered gear in the tranny into that housing. will my tranny have that adjustable dial on it?




a 28 teeth gear won't be ever same size/diameter piece than a for example 35 teeth

being diff diameter gears due diff teeth quantity will make some gears meet with the shaft and some gears not so thats the reason why the offset shape housing to get it closer to the shaft depending on the diameter of gear by the teeth account.

and yes you have that same piece on your tranny because is the part where you fit the speedo wire at tranny and infact where you mount the gear. It does also have casted the numbers rate where must be located into tranny according with the teeth account of gear. Tranny normally does have a DOT casted to set the clocking pointing out to that dot what as stated is at 6'oclock.

235/60 17 is 28.1" tall tire.

what I don't get is the calculator gives me a 30 teeth gear, and some charts gives 31

another usefull chart:

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: 3.23 and 727 speedo gear [Re: NachoRT74] #563240
12/26/09 06:05 PM 12/26/09 06:05 PM
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so do i need a 32 or 31 gear?

Re: 3.23 and 727 speedo gear [Re: roy2345] #563241
12/26/09 07:01 PM 12/26/09 07:01 PM
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Lincoln Nebraska
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I'd put a piece of flat stock on top of one of your rear tires and measure from the underside of it to ground for your exact diameter. With that # and your gear ratio (3.23) the simple chart in the archives worked for me dead on. Made my odo correct measured by the interstate mile markers and also my speedo correct measured at a roadside digital mph sign.

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