Im switching from the 85 mph speedometer to the 145 speedometer and i will need new gears is there anyone who knows what part number they are and how much they run and how hard they are to install


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86 Irocz, 305 bored 40 over, 211/221 comp cam,paw rocker arms 1.5,10:1 comp., stock heads, 100 shot of nitrous,

soon to be airflow research 190 cc heads, 373 gears to replace 273, and induction work

 

Best place to get one is a junk yard.
about the gears, I dont know the part number but I do know how to change it, its fairly easy. you have to remove the tail housing of the transmission and inside on the shat will be a red gear held in by a clip, remove the clip with a screw drive and something to pull it out like an "o" ring remover or someting....tap it of with a hammer lightly....put the new one on, you may have to tap that one on too,,,not to hard or you'll brake it. Now ya gotta get that clip back it....you may have to bend it bak into shape so it stays on but it goes.....I just re-installed my old one when replacing my tranny with one out of an 84 caprice....its about a 15 minute to half hour job to replace the gear though



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86 Firebird, 305 4bbl, Flowmaster 80 series.

 

Best place to get one is a junk yard.
about the gears, I dont know the part number but I do know how to change it, its fairly easy. you have to remove the tail housing of the transmission and inside on the shat will be a red gear held in by a clip, remove the clip with a screw drive and something to pull it out like an "o" ring remover or someting....tap it of with a hammer lightly....put the new one on, you may have to tap that one on too,,,not to hard or you'll brake it. Now ya gotta get that clip back it....you may have to bend it bak into shape so it stays on but it goes.....I just re-installed my old one when replacing my tranny with one out of an 84 caprice....its about a 15 minute to half hour job to replace the gear though



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86 Firebird, 305 4bbl, Flowmaster 80 series.

 

If all you are doing is replacing the speedometer, you dont need to change any gears.

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1989 IROC-Z 5.7L

 

Omar is correct. A speedo swap is a direct bolt-in. You dont have to change anything else.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

I want have to change the gear for the speedo. thats good but the one i got only reads 85 mph and the new one reads 145 are you sure it want mess up

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86 Irocz, 305 bored 40 over, 211/221 comp cam,paw rocker arms 1.5,10:1 comp., stock heads, 100 shot of nitrous,

soon to be airflow research 190 cc heads, 373 gears to replace 273, and induction work

 

No speedo gear change is required when swapping speedos, if the original speedo reads accurately to begin with.

Tim