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#1
02-12-2019, 07:22 PM
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Correct speedometer drive gear
Anyone know what speedo gear color is correct for a 4.33 rear end, 4 spd and running stock g70-14's ? any help would be appreciated. Currently I'm running about 10mph fast on speedometer. thx T
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70 RA3 Judge 4spd Orbit Orange 66 389 GTO Tri Power 4spd Montero Red 77 400 TA Auto Starlight Black 02 Trans Am WS6 Auto Sunset Orange |
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#2
02-12-2019, 07:47 PM
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Not sure what color gear you’ll need but I believe you’ll need a speedo adapter when running 4:33 gears. Then the ratio of the gears inside the adapter will determine what color (the number of teeth) you need. When I went from 3:23 gears to 3:90 that’s what i had to do.
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#3
02-12-2019, 08:40 PM
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I believe you need the 20 teeth, yellow color. This is used with the m21 close ratio 4 speed. No adapter is indicated.
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#4
02-12-2019, 10:54 PM
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Yellow 20 tooth is for the G70 and G78 tires in 1970 (as mentioned above...)
My 68 has the Orange 19 tooth gear which is correct for G77 tires according to my book. No adapter used in either of those years. |
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#5
02-14-2019, 12:17 PM
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thx everyone, researching further it is the yellow. Any idea where to get one? Ames does not show and I called to confirm. Also, in the resto book it does say an adapter is needed for 3.90 and 4.33's . GiPper, where did you get your adapter?
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70 RA3 Judge 4spd Orbit Orange 66 389 GTO Tri Power 4spd Montero Red 77 400 TA Auto Starlight Black 02 Trans Am WS6 Auto Sunset Orange |
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#6
02-15-2019, 10:35 AM
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Quote:
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#7
02-15-2019, 05:23 PM
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What is the tooth count of the gear that is in it now? You will need fewer teeth on the driven gear (the one on the outside of the transmission) to slow the speedometer down. The drive gear, attached to the output shaft inside the tail-shaft can also be changed, affecting the number of teeth needed on the driven gear. It seems odd that with 4.33s you are reading fast on the speedometer.
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 1969 Firebird 350 convertible, t-5, Carousel Red 2008 Solstice GXP 5speed manual, Sly 2008 Grand Prix, Ink Slate, Winter daily driver 2009 G8, Switchblade Silver, summer daily driver |
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#8
03-27-2019, 04:21 PM
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Quote:
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70 RA3 Judge 4spd Orbit Orange 66 389 GTO Tri Power 4spd Montero Red 77 400 TA Auto Starlight Black 02 Trans Am WS6 Auto Sunset Orange |
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