56Rat
Poster
Posts: 11
Reg: 06-23-19
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06-23-19 09:50 AM - Post#2769058
Hello, Im looking for advice on which colors gear set to use on my transmission. I put a set in it a while back, don't recalled the colors, but the speedometer worked for a while, but later sheared/smashed a few of the plastic teeth and quit working. Any help would be appreciated. 56 210, 350, 700R4, 15" tires, and a late 70s 10-bolt rear end.
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 acardon
Ultra Senior Member
Posts: 11311
Loc: DFW TEXAS
Reg: 03-25-05
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06-23-19 12:26 PM - Post#2769074
In response to 56Rat
You have to know the rear end ratio to figure the gear set, as well as the tire diameter, not the wheel diameter.
You may have the wrong housing for the gears you used, which could cause damage to the gears.
"Two aluminum housings 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."
Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)
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56Rat
Poster
Posts: 11
Reg: 06-23-19
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06-23-19 05:20 PM - Post#2769087
In response to acardon
Thank you.
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 GreatNorthWoods
"6th Year" Silver Supporting Member
Posts: 1065
Age: 77
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
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06-24-19 02:00 AM - Post#2769102
In response to 56Rat
I had a similar problem with my 700-R4 chewing up speedometer gears after it was rebuilt. I'm running a 70 Nova 10 bolt. The answer I came up with is an electrical speedometer...no gears to muck around with. It may be a bit more expensive but the speedometer can be calibrated yourself regardless of what rear end ratio you have. 
Vern
1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, Vintage Air, EZ Wire, Ididit column, Cruise/Tilt, 59 Vette Steering Wheel, 4-Wheel Disc Brakes, Posies Springs, Coker Radials, Nova 10-bolt, Mustang II front, Continental Kit |
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56Rat
Poster
Posts: 11
Reg: 06-23-19
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06-24-19 05:26 AM - Post#2769118
In response to GreatNorthWoods
I was thinking about possibly an electric setup, but the price is a little steep. I may try one more gear set up before i pull out the wallet. Thanks a bunch for your advice. I may end up following your lead.
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56Rat
Poster
Posts: 11
Reg: 06-23-19
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06-24-19 05:27 AM - Post#2769119
In response to GreatNorthWoods
I was thinking about possibly an electric setup, but the price is a little steep. I may try one more gear set up before i pull out the wallet. Thanks a bunch for your advice. I may end up following your lead.
Edited by 56Rat on 06-24-19 05:28 AM. Reason for edit: No reason given.
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acardon
Ultra Senior Member
Posts: 11311
Loc: DFW TEXAS
Reg: 03-25-05
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06-24-19 06:16 AM - Post#2769124
In response to 56Rat
Here's a calculator to find the right gears and charts for the gear colors for different transmissions. https://www.tciauto.com/speedometer-gear-calc ulato...
The different housings provide the correct gear mesh for different size gears.
Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)
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Edited by acardon on 06-24-19 06:17 AM. Reason for edit: No reason given.
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GreatNorthWoods
"6th Year" Silver Supporting Member
Posts: 1065
Age: 77
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
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06-25-19 03:54 AM - Post#2769202
In response to 56Rat
What I think happened on mine is that the transmission re-builder replaced the tail shaft on my 700-R4 with one that had a different drive gear. I never found out why the tail shaft needed replacement or why they did not remove the old drive gear from the old tail shaft and put it in the replacement. I never had any speedometer gear problems with the transmission before I had it rebuilt. Afterward, it chewed up about three driven gears before I gave up on it and installed the electric speedometer. 
Vern
1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, Vintage Air, EZ Wire, Ididit column, Cruise/Tilt, 59 Vette Steering Wheel, 4-Wheel Disc Brakes, Posies Springs, Coker Radials, Nova 10-bolt, Mustang II front, Continental Kit |
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56Rat
Poster
Posts: 11
Reg: 06-23-19
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08-03-19 09:04 AM - Post#2772307
In response to GreatNorthWoods
Thanks to all for all the great advice on speedometer gears getting chewed inside my 700r4 tailshaft. Most of the advice was very helpful. I finally solved the problem. I shot at the problem from all angles. I noticed a considerable amount of end play at the rear shaft and I also noticed that the trans mount had no bolts in it. The trans was just resting on the mount. So, I bolted down the trans, installed a new yoke. I also put a new bushing and seal in the housing. I reduced nearly all of the shaft end play. Installed a new set of gears and a new steel cased cable. Finally speedometer works beautifully. Thanks again for all the input.
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