Speedo and output shaft Info
Early T-700's came with regular cable driven speedo's. Some where in the 80's GM Started changing to an electronic speedo, they did not change all applications at the same time. Depending on the vehicle that your 700/4L60 came from, it could have electronic or cable speedo. This will show you how to convert it back to a cable driven speedo if that is needed.
Here is a "signal generator" disc on an output shaft of a 700R4. This is used for an electronic speedo. The sleeve behind it is for sealing up the drive shaft yoke. Some yokes have breather holes in the end near the u-joint.
You can remove this disc(pull it off), under it will most likely be 2 holes. Install a standard retaining clip and plastic speedo drive gear for a 700R4 in the "front hole", unless you are working on a Corvette trans. The rear hole seen slightly covered by the disc and is used with corvette tail housings. Installing a standard speedo bullet and gear into the tail housing will complete the conversion from electronic speedo to cable speedo.
Do NOT use a chisel to remove the metal reluctor on the shaft. A slight amount of heat from a propane torch will allow easy removal with a large wrench over the output shaft. Tap the reluctor off the shaft. The pictured shaft is now JUNK.
Here is a picture of the needed parts to refit an electronic speedo to a cable type.
The clip fits into the mentioned hole on the output shaft and holds the drive gear on. The speedo "bullet and gear" replace the electronic pick-up. The speedo bullet has numbers on it to tell you what tooth count of gears it is set to handle. The wrong tooth count and the gears will tear themselves up or not work at all!
Here are a few GM part numbers for the "driven" speedo gears.
9774413 34 Lt Green
9780628 35 Orange
1359270 36 White
1359271 37 Red
1359272 38 Blue
1359273 39 Brown
1362048 40 Black
1362195 41 Yellow
1362049 42 Green
1362196 43 Purple
9780470 44 Dk Gray
9775187 45 Lt Blue
Warning
Speed-O gears for a Chevrolet T-350 are the WRONG diameter for a 700/4L60 tranny! They are too large. They will fit the 700 output shaft, but will tear up the driven gear in a 700 / 4L60.
Here is photos of the installed plastic gear and retaining clip.
Here is a signal pick-up coil for the electronic speedo that you are converting.
Here is a picture of an early gear driven electronic speedo bullet for the 700R4. To replace this, all you need are the speedo bullet and gears to convert to cable.
This picture shows the different speed-O housings. On the left is a T-400, middle is T-700/4L60, last is an early BOP T-350. BOP means Buick,Olds
,Pontiac.
Notice the O-ring "groove" location on the BOP and 700 units. The T-350 BOP housing may leak with the O-ring out further when used in a 700/4L60
unit.
The T-400 is smaller at 1.935 in diameter. The 700/4L60 unit is 2.080 in diameter
This page was updated 10-09-2008.
Tranz page
Crosley's Home Page
Here is a picture of the needed parts to refit an electronic speedo to a cable type. The clip fits into the mentioned hole on the output shaft and holds the drive gear on. The speedo "bullet and gear" replace the electronic pick-up. The speedo bullet has numbers on it to tell you what tooth count of gears it is set to handle. The wrong tooth count and the gears will tear themselves up or not work at all!
Here are a few GM part numbers for the "driven" speedo gears.
9774413 34 Lt Green
9780628 35 Orange
1359270 36 White
1359271 37 Red
1359272 38 Blue
1359273 39 Brown
1362048 40 Black
1362195 41 Yellow
1362049 42 Green
1362196 43 Purple
9780470 44 Dk Gray
9775187 45 Lt Blue
Warning
Speed-O gears for a Chevrolet T-350 are the WRONG diameter for a 700/4L60 tranny! They are too large. They will fit the 700 output shaft, but will tear up the driven gear in a 700 / 4L60.
Here is photos of the installed plastic gear and retaining clip.
Here is a signal pick-up coil for the electronic speedo that you are converting.
Here is a picture of an early gear driven electronic speedo bullet for the 700R4. To replace this, all you need are the speedo bullet and gears to convert to cable.
This picture shows the different speed-O housings. On the left is a T-400, middle is T-700/4L60, last is an early BOP T-350. BOP means Buick,Olds
,Pontiac.
Notice the O-ring "groove" location on the BOP and 700 units. The T-350 BOP housing may leak with the O-ring out further when used in a 700/4L60
unit.
The T-400 is smaller at 1.935 in diameter. The 700/4L60 unit is 2.080 in diameter
This page was updated 10-09-2008.
Tranz page
Crosley's Home Page
Here is a signal pick-up coil for the electronic speedo that you are converting.
Here is a picture of an early gear driven electronic speedo bullet for the 700R4. To replace this, all you need are the speedo bullet and gears to convert to cable.
This picture shows the different speed-O housings. On the left is a T-400, middle is T-700/4L60, last is an early BOP T-350. BOP means Buick,Olds ,Pontiac.
Notice the O-ring "groove" location on the BOP and 700 units. The T-350 BOP housing may leak with the O-ring out further when used in a 700/4L60 unit.
The T-400 is smaller at 1.935 in diameter. The 700/4L60 unit is 2.080 in diameter
This page was updated 10-09-2008.
Tranz page
Crosley's Home Page