1980 - 1986 Bullnose F100, F150 & Larger F-Series TrucksDiscuss the Early Eighties Bullnose Ford Truck
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Speedo is inop, just got a tach from the junk yard. Have been just going with the flow of traffic, hoping not to get pulled over for speeding.
I have the the inline 6 with the 4 speed manual overdrive with 3.08 rear end and stock tires. Buying a speedo would be a good idea, but the gear inside the trans is stripped.
Can anyone tell me what speed they are going and what RPM and gear?
Is all that is making the speedo inop. the stripped gear? Are you talking about the plastic gear at the end of the speedo cable where it goes into the tail houseing of the tranny? It is cheap part at dealership or junk yard, just need to know how many teeth on the gear. Give or take you should be running 2143 rpms in 3rd at 60 mph and 1607 in OD.
The whole speedo cable was replaced, brand new gear on the cable, cluster was swapped with a known working cluster.
The RPMs sound about right though. Last night I found out that the new Honda Civics have massive digital speedo displays that can be seen day or night, too bad that they accelerate a bit faster than I can... Thanks for the #'s.
It's very simple thing to check. Get on the interstate and get someone to time how much it takes to go from mile marker to mile marker. If it takes less than a minute, slow down a little bit and try again. If it takes longer than a minute, speed up. When you get it to a minute, you are going 60 mph. That will get you started marking the tach for speed, though this will only be good in high gear.
I've been out of town and while trying to "catch up", I just read your thread. My 1986 F150 with 4.9L, 4 speed OD [SROD], 3.08 rear gears and original sized tires [215/75 X 15] does as follows in O.D.: 1000 rpm = 35 mph [going downhill]; 1500 rpm = 53 mph; 2000 rpm = 70 mph.
By the way, on my honeymoon in the Caribbean, about half of all the trucks that I saw were 80-96 Fords (the other half was still Fords, just the most recent F-250's, oh, and like 2 chevys and a dodge,) doubtfully with anything other motor than the 300 based on the landscape. Anything else would crap out with the stop and go, ups and downs and minimally maintained roads after that much time. Probably would be my choice if I make the move after deployment.
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