700r4 question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

77c10 · 04-21-2013, 10:03 AM

I recently swapper a 700r4 in my 77 c10. My problemis that my speedometer does not work. I unhooked the cable at the trans and spun it with a drill and my buddy told me the speedo moved. Before I hooked the cable back up I grabbed the end of the driven gear that the cable goes into and I could spin it by hand. This leads me to believe that it is not "meshing" with the gear on the tail shaft of the trans. I spun it several times and tried to push in on it but it would not go in any further.

I am wondering if the driven gear is too large to mesh with the drive gear. Best I remember the drive gear was brown and the driven gear is red.

04-21-2013, 10:03 AM	#1
77c10 Registered User Join Date: Aug 2011 Location: Gallatin, TN Posts: 782	700r4 question I recently swapper a 700r4 in my 77 c10. My problemis that my speedometer does not work. I unhooked the cable at the trans and spun it with a drill and my buddy told me the speedo moved. Before I hooked the cable back up I grabbed the end of the driven gear that the cable goes into and I could spin it by hand. This leads me to believe that it is not "meshing" with the gear on the tail shaft of the trans. I spun it several times and tried to push in on it but it would not go in any further. I am wondering if the driven gear is too large to mesh with the drive gear. Best I remember the drive gear was brown and the driven gear is red. __________________ 77 C10, 6.0LS/4L80E, 3:73 12 bolt. Boss 338's 20" x 10" w/ 285/50/20 rear. 20" x 8.5" w/ 245/40/20 front. Vintage Air. Full Autometer gauges recessed in factory bezel (Thanks bigblock73!) Gm Storm Grey Metallic paint "Cool ain't ever cheap and cheap ain't ever cool"



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