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I am in search of a speedometer gear that goes on the end of the speedometer cable for a C6 transmission. I do not have the one from the old cable to switch over to my new cable.
Does anyone know what the factory tooth count is for a 1982 C6? I know you can get replacement gears for different axle ratios but I am not sure how many teeth I need. The truck the transmission came from is an all stock 82 f150.
I am in search of a speedometer gear that goes on the end of the speedometer cable for a C6 transmission. I do not have the one from the old cable to switch over to my new cable.
Does anyone know what the factory tooth count is for a 1982 C6? I know you can get replacement gears for different axle ratios but I am not sure how many teeth I need. The truck the transmission came from is an all stock 82 f150.
You will need to know the rear axle ratio and the number of teeth on the drive gear in the trans and the tire diameter to calculate the number of driven teeth on the speedo gear.
The formula for calculating the driven gear number of teeth on the speedo cable is as such
# DRIVE TEETH x AXLE RATIO x TIRE REV. PER MI.
_____________________________________________ = # DRIVEN TEETH
1001
To calculate tire revs per mile
20168
_______________________________ = REVIOLUTIONS PER MILE
TIRE DIAMETER (in inches)
So with that
Assuming you have 7 Drive teeth in the trans
We know the tire diameter is 28.89"
So 20168 / 28.89= 698.096 And round to 698 Revs per mile.
So knowing that
we can use the other formula
7 x 3.92 x 698 / 1001 = 19.13 And to round it to 19 So you need a driven gear with 19 teeth.
I saw that formula, however how do I know the drive gear teeth number? Is 7 teeth standard?
You will have to either post the tans tag here so someone like Bill can search it up. Or you will have to count then through the hole in the tail shaft.
If I recall correctly on the C6 they are machined into the output shaft. See below pic of a C6 output shaft.. On the exploded view that would be 7060. And I do not see a separate speedo drive gear on the exploded view either.
I am in search of the speedometer DRIVEN gear that goes on the end of the speedometer cable for a C6 transmission. I do not have the one from the old cable to switch over to my new cable.
Does anyone know what the factory tooth count is for a 1982 C6? I know you can get replacement gears for different axle ratios but I am not sure how many teeth I need.
The truck the transmission came from is a 1982 F150.
E1TP-BB ~ PGD-DL2
DRIVEN speedometer gear at the end of the cable. On a C6, the speedometer DRIVE gear is made as part of the output shaft.
To figure out which DRIVEN gear is correct, the rear axle ratio is required.
I know the rear axle ratio, but don’t I need to know the drive gear teeth so I can figure out which driven gear I need?
From what I have read, there could be anywhere from 6-9 teeth on the drive gear. Maybe I’m wrong and there’s a standard number on the C6, but I can’t find that information.
I know the rear axle ratio, but don’t I need to know the drive gear teeth so I can figure out which driven gear I need?
From what I have read, there could be anywhere from 6-9 teeth on the drive gear. Maybe I’m wrong and there’s a standard number on the C6, but I can’t find that information.
Geez Louise!
I need the rear axle ratio, to figure out what the correct DRIVEN gear is.
I don't give a hoot for how many DRIVE gear teeth it has, because it has nothing to do with it, despite what someone told you!
You post the ratio, I'll post the correct DRIVEN gear and the parts catalog pic where I found it.
I need the rear axle ratio, to figure out what the correct DRIVEN gear is.
I don't give a hoot for how many DRIVE gear teeth it has, because it has nothing to do with it, despite what someone told you!
You post the ratio, I'll post the correct DRIVEN gear and the parts catalog pic where I found it.
Gear ratio is 3.55, it is not original to the truck.
In my defense, you never requested the rear axle ratio nor explained why the drive gear information is not required (still have not). Every single thread, article, website I have found states that the drive gear teeth information is required and every single formula I have found needs that information. I specifically asked if that information is standard, with no response.
I appreciate the help, I am not trying to be difficult, but you didn't request any information from me and I am not smart enough to guess.
Gear ratio is 3.55, it is not original to the truck.
In my defense, you never requested the rear axle ratio nor explained why the drive gear information is not required (still have not). Every single thread, article, website I have found states that the drive gear teeth information is required and every single formula I have found needs that information. I specifically asked if that information is standard, with no response.
I appreciate the help, I am not trying to be difficult, but you didn't request any information from me and I am not smart enough to guess.
Bill needs the stock rear axle ratio form the truck the transmission came from. With that the parts book will tell him the number of drive teeth on the output shaft.
The door jamb certification sticker will have this info on it.
Since the trans came from something else and you likely do not have this info. You are going to have to count the number of gear teeth on the output shaft shaft through the speedo gear hole.
Baring that you will have to pull the tail housing.
Bill can look up the part number & availability of the driven gear originally installed at the factory.
I just went and looked at that stuff, there are at least 5 different versions of that output shaft used in trucks & vans1980/89.
No idea about sedans, those are different books.
I will wait and see if he will post the pages from the parts book, he can do it lots faster & easier than I can.
Gear ratio is 3.55, it is not original to the truck.
In my defense, you never requested the rear axle ratio nor explained why the drive gear information is not required (still have not). Every single thread, article, website I have found states that the drive gear teeth information is required and every single formula I have found needs that information. I specifically asked if that information is standard, with no response.
The only time the DRIVE gear is pertinent, is when there is one. There isn't one w/a C6 so the parts catalog makes no mention of same.
Here's a pic of F250/350 with 3.54-1 ratio, the closest there is. The DRIVEN gears are listed, but that's it.
