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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2019 Posts: 223 'Bolter | | 'Bolter Joined: Sep 2019 Posts: 223 | Is it possible to connect a 4L60E transmission to the original speedometer on a '50 3100? If so, what provisions are required? | | | | | Joined: Sep 2013 Posts: 1,362 'Bolter | | 'Bolter Joined: Sep 2013 Posts: 1,362 | A very possible way is Abbott Tachograph here. Never used them but they're a small company that's been around for 50 years. The owner started out designing/building/supplying data loggers/tachographs for the trucking industry. Good Luck, RonR
RonR
1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5
| | | | | Joined: Jul 2019 Posts: 559 'Bolter | | 'Bolter Joined: Jul 2019 Posts: 559 | Jegs sell their version of the “cable X” too. Its just a VSS electronic input (from trans) then it has a board that does the calculation and drives a electric motor that drives a stock GM speedo cable. I have seen them previously used in older swap muscle cars and I will be installing one in a turbo LS 50 chevy pickup very soon. | | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | We don't use cable or electronic speedometers anymore but rather GPS units that are not affected by gearing or tire size. Only around $60 but no one has come out with a 5" face one for a direct fit into an AD truck. Someone has dropped the ball on this since there would surely be a market for such. The <> 3.5" face ones with a custom made bezel are okay but not right.
Evan
| | | | | Joined: Sep 2008 Posts: 293 'Bolter | | 'Bolter Joined: Sep 2008 Posts: 293 | You can swap the tailshaft housing for one from an older TH700R4, with a mechanical speedo drive. Then you may need a custom-made cable with the correct ends, I do not remember what kind of cable I had used on mine. Changing the tailshaft housing also makes it easy to change the driven/drive gear, so that the speedo is correct.
No electronics, OEM simplicity and reliability.
Last edited by wave1957; 01/18/2021 10:42 AM.
'57 Chevy Suburban; '70 Chevy Impala.
| | | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | If your tailshaft is the later 8 bolt version, you're out of luck. The cable x style system is it. | | |
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