Electric Speedo
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Location: KC. KS
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Car: 89 Firebird
Engine: 408
Transmission: 700r4
Axle/Gears: 12 bolt/4.11
Electric Speedo
I did a search on this and didnt find anything to help me. I have an 89 Firebird with an electric speedo that needs to be calibrated. How do I go about calibrating it?? Do I just need to change the drive and driven gears or is there another way??
Thanks for any input!
Thanks for any input!
Last edited by BlkBird408; 07-22-2006 at 08:25 PM.
#2
Yes, the drive gear in the transmission and the driven gear on the VSS can be changed.
With the TH700-R4, the drive gear (on the tailshaft) selections are:
17T Blue GM #8640518
15T Gray GM #8642620
The driven gear (on the VSS) selections are:
45T Lt. Blue GM #9775187
44T Dk. Gray GM #9780470
43T Purple GM #1362196
42T Green GM #1362049
41T Yellow GM #1362195
40T Black GM #1362048
39T Brown GM #1359273
38T Blue GM #1359272
37T Red GM #1359271
36T White GM #1359270
35T Orange GM #9780628
34T Light Green GM #9774413
With the TH700-R4, the drive gear (on the tailshaft) selections are:
17T Blue GM #8640518
15T Gray GM #8642620
The driven gear (on the VSS) selections are:
45T Lt. Blue GM #9775187
44T Dk. Gray GM #9780470
43T Purple GM #1362196
42T Green GM #1362049
41T Yellow GM #1362195
40T Black GM #1362048
39T Brown GM #1359273
38T Blue GM #1359272
37T Red GM #1359271
36T White GM #1359270
35T Orange GM #9780628
34T Light Green GM #9774413
#3
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Join Date: Mar 2006
Location: KC. KS
Posts: 357
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Car: 89 Firebird
Engine: 408
Transmission: 700r4
Axle/Gears: 12 bolt/4.11
Thanks Vader!! I found out by using a calibration calculator that with a 15 tooth drive gear I would need a 48 tooth driven gear. The highest I see is a 45 tooth so would it help much to put the 45 in or do those 3 teeth make that much difference??
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