700R4 speedo gear diameter housing (?)

[gchemist]

Can someone give me the part numbers for the diameter speed gear housings on a 700R4? There are two 2.078" diameter housings, each made from either aluminum or plastic, are available for driven gears with 34 or more teeth. One fits gears from 34 - 39 teeth and the second one fits gears from 40 - 45 teeth. The driven gear housings go in the tailhousing assembly on all two-wheel drive applications.
To calibrate my new 70R4/locking torque converter I need the larger 18 drive tooth with the 43 driven gear. I need the part number for the larger gear housing. Anyone know how much one cost? I have the 18 tooth drive gear, the driven gear cost $8 at the dealer but I have no idea what the housing cost. Anyone know what year model cars had them available? I need to calibrate my speedo correctly so the tranny builder can test drive my truck and check the shift for the warranty.


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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/

[gchemist]

Just incase some else needs the numbers. To calibrate a 26' inch tire you need a 43 driven gear with an 18 tooth drive gear and a 3.08 rear end/700R4 combo. Works great now!!

Sleeve (housing) #25512340 for 34 - 39 teeth gears
Sleeve (housing) #25512339 for 40 - 45 teeth gears



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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/

[Fast68Chevy]

how and where in the fudge did you find that out ?

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It's 68's or bust !!!
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[gchemist]

Hey, your talking to a chemist. I know math.

Okay, it was simple. Go to this page. http://www.tciauto.com/tech_info/speedo_gears.htm

You can use the page to calibrate any 350th, 400TH or 700R4 for just about any tire size. Just plug in the numbers.
For example:
If I use a 17 tooth drive gear with 3.08 ratio and 26 inch tire the drive gear is 40.57 or approximately 40 or 41 tooth gear. Depending on which way you want your speed to read. A little fast or a little slow.
Okay now take an 18 tooth drive gear with the same info and you get 42.98. Now that is really closer to a whole number (43). The closer to a whole number you get the better the speedo will read. To find your combo just place with the drive gear number until you get close to a whole number for the driven tooth gear.

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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/