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sm420 trans screw in speedometer gear
#1364687 Fri Jun 12 2020 11:41 PM
Joined: Jan 2014
Posts: 86
B
BJF52 Offline OP
Shop Shark
I know this has been asked before and i have been looking for a while . Who may have a screw in bullet looking speedometer gear for sale these days for a SM420 trans. The kind that screws into the case. THANKS BJF

Re: sm420 trans screw in speedometer gear
BJF52 #1364697 Sat Jun 13 2020 01:29 AM
Joined: Jan 2013
Posts: 1,662
S
Shop Shark
You have to match the torpedo to the speedometer drive gear on the yoke or there will be carnage. Different pitchs and gear tooth counts


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: sm420 trans screw in speedometer gear
BJF52 #1364701 Sat Jun 13 2020 02:01 AM
Joined: Jan 2002
Posts: 2,097
C
Shop Shark
Yes, the rear wheel diameter will dictate the gear size that screws into the gearbox.


Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.

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