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hooking the T-5 to a stock speedo?
- Thread starter Firebuff
- Start date
kmathis
Donation Time
Hi,
The 55RA adapter at the website below...I believe I used a 28% reduction because I have a 3.70:1 rear axle. You can have a local speedometer shop put the proper screw on end (GM) on the stock speedo cable. You may need to cut or indent the tunnel for clearance.
So if you have a Smiths stock speedometer, it turns 1020 per mile, so, there are 5280 ft in a mile, so if you measure out 50 feet ( accurately) and move your car exactly 50 ft, the speedo cable should turn 9.65 times to be spot on accurate. If it turns more, you will need to slow it down, if it turns less you will need to speed it up. so get the ratio adapter that is closest to the amount of error, and you can change gears to dial it in.
The adapter is about $90 bucks, and the gears you can get at your local Ford dealer for about 5 buck each, on this site, they are about 15 bucks each.
http://www.transmissioncenter.net/speedometer_calibration_______va.htm#Ford_Manual
The 55RA adapter at the website below...I believe I used a 28% reduction because I have a 3.70:1 rear axle. You can have a local speedometer shop put the proper screw on end (GM) on the stock speedo cable. You may need to cut or indent the tunnel for clearance.
So if you have a Smiths stock speedometer, it turns 1020 per mile, so, there are 5280 ft in a mile, so if you measure out 50 feet ( accurately) and move your car exactly 50 ft, the speedo cable should turn 9.65 times to be spot on accurate. If it turns more, you will need to slow it down, if it turns less you will need to speed it up. so get the ratio adapter that is closest to the amount of error, and you can change gears to dial it in.
The adapter is about $90 bucks, and the gears you can get at your local Ford dealer for about 5 buck each, on this site, they are about 15 bucks each.
http://www.transmissioncenter.net/speedometer_calibration_______va.htm#Ford_Manual
bulldurham
Platinum Level Sponsor
If the local Ford dealership delivers the right part tomorrow AM, the cost is $49.00 for the mechanical cable adapter. Probably too good to be true.
I am using the 3.8, T5, 3.89 rear gear and the tire height is 24" and a Series V speedometer. Does this call for a reduction gear?
I am using the 3.8, T5, 3.89 rear gear and the tire height is 24" and a Series V speedometer. Does this call for a reduction gear?
kmathis
Donation Time
The part that I left out earlier is the fact that I had a ford end put on my stock speedo cable, so that is how I knew how many turns I had in 50'; without that, the calculations of 7 teeth on the output shaft, how many gear teeth, etc...and then the adapter with the GM cable end.
where is my calculator?
where is my calculator?
bulldurham
Platinum Level Sponsor
Not having been down this road before I am not clear on the process or terminology.
On which end of the cable did you have the "ford end" installed? The part I have ordered is on the trans end of the cable and going directly into the output
shaft. I have an adapter [ 7/8ths to 5/8ths ] to connect the cable to the driven gear assembly. The gauge end is 5/8ths of course.
So the issue is to get the right driven gear, 18,21, etc to obtain a fairly accurate speedo reading ??
On which end of the cable did you have the "ford end" installed? The part I have ordered is on the trans end of the cable and going directly into the output
shaft. I have an adapter [ 7/8ths to 5/8ths ] to connect the cable to the driven gear assembly. The gauge end is 5/8ths of course.
So the issue is to get the right driven gear, 18,21, etc to obtain a fairly accurate speedo reading ??
Hi Doug,
If you don´t change the tail shaft gear, you´ll need the 21 tooth driven gear, but you´ll still be reading about 10% fast, which is better than reading the other way around. If it were to read slow, you could easily be speeding asnd not be aware, while if it reads fast, it will keep you more allert to how fast you are going.
The end you ordered is the correct end. You´ll need to have a speedo shop swedge it on for you and also swedge down the cable end so it will fit the smaller Ford gear.
Jose
If you don´t change the tail shaft gear, you´ll need the 21 tooth driven gear, but you´ll still be reading about 10% fast, which is better than reading the other way around. If it were to read slow, you could easily be speeding asnd not be aware, while if it reads fast, it will keep you more allert to how fast you are going.
The end you ordered is the correct end. You´ll need to have a speedo shop swedge it on for you and also swedge down the cable end so it will fit the smaller Ford gear.
Jose
bulldurham
Platinum Level Sponsor
Thanks for the info; may have it worked out.