My brother recently went trough his 75' TA and rebuilt the T-10 tranny, rebuilt the engine, and geared the rear from a 3.23 to a 4.11. When putting the tranny back together he realized that he would need a new speedo gear with the change in rear gears. He called up the local dealer and they can't tell him anything so he's on his own. I know a lot of you guys out there have done things like this and might know which speedo gear he needs to use, any help would be great, thanks.
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