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Old 07-15-2017, 01:37 PM   #1
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Recalibrate speedometer?

The previous owner of my '98 BB TC2000 upgraded to highway gears, so the speedo is about 15mph off. How do I fix it?


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Old 07-15-2017, 04:40 PM   #2
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I would imagine that your local dealer could do it. It's not a DIY project.
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Old 07-15-2017, 04:56 PM   #3
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i don't know if thats mechanical or not, but the mechanical transmissions have a speedometer gear by rear end.

i have seen a list of different part numbers on a '92 BB partlist for the speedogear.

here is picture of a page from an online catalog.



if you have an electronic motor, i have no clue.

hope that helps
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Old 07-15-2017, 05:00 PM   #4
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easy way to tell is crawn underneath and at the rear of the transmission tailshaft (on a 545 its usually on the driver side).. see if there is a pair of wires coming off or a cable coming off (not the shifter)..

if its a cable then you have a gear.. if all you need to change is the DRIVEN gear and not the drive gear then its super easy... that cable pops out and you swap a new gear in..

if you have an electronic speedometer then there is any number of ways that it might need set..

for example my 1991 bus is a fully mechanical engine but I have an electric speedometer.. in that case there are dip switches on the speedometer cluster that you set.. (I did it when I changed tire size).. im not sure on a bluebird how its done. just throwing out ideas..

-Christopher
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Old 07-15-2017, 05:09 PM   #5
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Quote:
Originally Posted by cadillackid View Post
easy way to tell is crawn underneath and at the rear of the transmission tailshaft (on a 545 its usually on the driver side).. see if there is a pair of wires coming off or a cable coming off (not the shifter)..

if its a cable then you have a gear.. if all you need to change is the DRIVEN gear and not the drive gear then its super easy... that cable pops out and you swap a new gear in..

if you have an electronic speedometer then there is any number of ways that it might need set..

for example my 1991 bus is a fully mechanical engine but I have an electric speedometer.. in that case there are dip switches on the speedometer cluster that you set.. (I did it when I changed tire size).. im not sure on a bluebird how its done. just throwing out ideas..

-Christopher


Thanks! I'm familiar with the dip switches as my van has that. Couldn't find one on the bus so that's what prompted the question. I'll take a peak under the bus when we stop for wires and such.


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Old 07-15-2017, 05:09 PM   #6
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Quote:
Originally Posted by turf View Post
i don't know if thats mechanical or not, but the mechanical transmissions have a speedometer gear by rear end.



i have seen a list of different part numbers on a '92 BB partlist for the speedogear.



here is picture of a page from an online catalog.







if you have an electronic motor, i have no clue.



hope that helps


Thanks!!


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Old 07-20-2017, 02:18 PM   #7
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Originally Posted by cadillackid View Post
easy way to tell is crawn underneath and at the rear of the transmission tailshaft (on a 545 its usually on the driver side).. see if there is a pair of wires coming off or a cable coming off (not the shifter)..

if its a cable then you have a gear.. if all you need to change is the DRIVEN gear and not the drive gear then its super easy... that cable pops out and you swap a new gear in..

if you have an electronic speedometer then there is any number of ways that it might need set..

for example my 1991 bus is a fully mechanical engine but I have an electric speedometer.. in that case there are dip switches on the speedometer cluster that you set.. (I did it when I changed tire size).. im not sure on a bluebird how its done. just throwing out ideas..

-Christopher
Ok - so a couple details that might be helpful. The rear axle ratio is 4.78, which I am told by the previous owner is the newer gears he put in.

I finally got around to crawling under there. So this must be the speedometer sensor and there's a wire coming out of the top. So does that mean I need to find some dip switches somewhere?








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Old 07-20-2017, 03:02 PM   #8
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i'm curious about the speed sensor too.

my at545 has 2 wires that come off in the same spot as the picture above.

my at1545 has 2 wires that come off next to the gear selector.

in either case, those 2 wires have to carry a neutral start switch, a reverse light indicator and a speed signal.

the only other electrical connection is the ground strap on the transmission.

someone start splainin'

curious that the old owner would put in a 4.78. that would take you from probably 58mph to 65mph.

mines a 4.78 and i'd go for a 4.3 or 4.1
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Old 07-20-2017, 03:56 PM   #9
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i'm curious about the speed sensor too.

my at545 has 2 wires that come off in the same spot as the picture above.

my at1545 has 2 wires that come off next to the gear selector.

in either case, those 2 wires have to carry a neutral start switch, a reverse light indicator and a speed signal.

the only other electrical connection is the ground strap on the transmission.

someone start splainin'

curious that the old owner would put in a 4.78. that would take you from probably 58mph to 65mph.

mines a 4.78 and i'd go for a 4.3 or 4.1


I suspect my RPMs are lower. Iowa to Ohio I stayed around 60mph and my RPMs were 2k. Tracking via GPS I got just over 12mpg. Bus weighed ~18,500 on that trip. On a flat run I can get just over 70mph tops.

So, how does all of that compare to someone with stock gears? \_(ツ)_/


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Old 07-20-2017, 04:18 PM   #10
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thats real good!

i have the same set up

5.9, at545, 4.78 rear. i'm 19k lbs

top speed of about 72

i get 7.5mpg
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