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Old December 23rd, 2016, 10:33 PM
James James is offline
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Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
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Default Re: SM420 speedometer

Quote:
Originally Posted by Sponge View Post
Hello,

This would be awesome but as of today, I still can't remove it, I can't find a deep socket. I tried 22mm but to small and 24mm too big....

What is it in inch? 15/16"


I made a lot of researches and I remember having read that for a 4.11 rear end ratio, it was a 12 tooth.

What do you have and how much you want for?
Yes it is 15/16". However a 24 mm deep broach socket will fit, I tried it and it fit on the spare unit I have. The only problem you might have is the socket outside diameter might be too big and it is hitting on the case. If this is what happening you will need to grind on the socket to clear the transmission.

In my truck it did have a 4.10:1 rear axle and the speedometer gear I pulled out had 11 teeth with 3 teeth on the gear inside the transmission.
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