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#1069169 - 01/11/21 08:57 PM speedo gear  
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markg Offline
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markg  Offline
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nj
i have a 84 monte with a 325 rear and a 200r4 trans and i run 30 in tall tires in the rear.
i put a 115 stock speedo in it.
apparently this combo is way off for my speedo calibration because it reads way low.
whatgear can i get for the trans?i dont want to chage the one on the shaft if i dont have to.


86 ss 86 cl,330hp GM vortec cratemotor-700-r trans worked,ford 9.5 inch rear with 3-50s,custom 3 inch exhaust with flowmasters.
#1069172 - 01/11/21 10:59 PM Re: speedo gear [Re: markg]  
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mmc427ss Online content
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mmc427ss  Online Content
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Pottstown, Pa
Need to see if someone knows what the drive gear tooth count is on your 700R. Myself no idea. Once you know the drive you can plug it into here. Typical speedo in GM is 1000 rev per mile.
http://www.wallaceracing.com/speedo-calculator.php
Bob

#1069177 - 01/12/21 02:16 PM Re: speedo gear [Re: markg]  
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upflying Offline
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Reno, NV


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1069179 - 01/12/21 03:47 PM Re: speedo gear [Re: markg]  
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markg Offline
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markg  Offline
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nj
thank you.....do any of you know what the stock gear is for a 87 ss with a 200r4?


86 ss 86 cl,330hp GM vortec cratemotor-700-r trans worked,ford 9.5 inch rear with 3-50s,custom 3 inch exhaust with flowmasters.
#1069182 - 01/12/21 06:17 PM Re: speedo gear [Re: markg]  
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mmc427ss Online content
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mmc427ss  Online Content
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Pottstown, Pa

#1069197 - 01/13/21 11:11 AM Re: speedo gear [Re: markg]  
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markg Offline
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markg  Offline
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nj
thanks....its a 200r.
the car in my signature is a different vehicle.
thank you!


86 ss 86 cl,330hp GM vortec cratemotor-700-r trans worked,ford 9.5 inch rear with 3-50s,custom 3 inch exhaust with flowmasters.
#1069252 - 01/16/21 01:14 AM Re: speedo gear [Re: markg]  
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mmc427ss Online content
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mmc427ss  Online Content
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Pottstown, Pa
By the way the mechanical speedometer in most GM cars is set up that 1000 rpm input = 60 mph. So an 85 and 120 Monte speedo should read the same mph when swapped.
Bob

#1069261 - 01/16/21 05:43 PM Re: speedo gear [Re: markg]  
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markg Offline
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markg  Offline
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nj
thank you.....the calculator says i need 457 and i have 333 now.
it looks like the closest i can get without changing the one on the trans shaft is 385 which is a 26 tooth.
this would bring me much close and i would be happy with that.
im having difficulty finding a single 26 tooth one though.
any ideas?


86 ss 86 cl,330hp GM vortec cratemotor-700-r trans worked,ford 9.5 inch rear with 3-50s,custom 3 inch exhaust with flowmasters.
#1069263 - 01/16/21 06:51 PM Re: speedo gear [Re: markg]  
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Fred SS Offline
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Fred SS  Offline
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Glassboro, NJ
You could try gbodyparts.com for speedo gears.


87 SS, Harwood cowl induction hood, UMI trailing arms. Edelbrock TES Headers (Jet Hot Coated). Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, Bilsteins, TCI 2400 stall converter, Ramcharger fans, Denny's 3.5" Driveshaft, GBodyParts GNX Wheels.
#1069264 - 01/16/21 07:05 PM Re: speedo gear [Re: markg]  
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mmc427ss Online content
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mmc427ss  Online Content
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Pottstown, Pa
Here's the GM part number for a 26 tooth, #25502669, Brown, driven gear for a 200R4. Found a couple on Fleabay.
Bowtie has them. GM parts doesn't have them anymore.
https://www.bowtieoverdrives.com/catalog/catalog.php?Action=GETSUBCAT&CATID=DA1A2
Bob


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