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Old 04-21-2013, 10:03 AM   #1
77c10
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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.
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Old 04-21-2013, 11:01 AM   #2
gchemist
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Re: 700r4 question

There are two housings for gears. One housing is used for 40-45 driven tooth gears. The other is used for 34-39 driven gears. Check the housing part number and tooth color. Check drive gear. Check for broken or missing teeth.
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Old 04-21-2013, 12:23 PM   #3
77c10
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Re: 700r4 question

Quote:
Originally Posted by gchemist View Post
There are two housings for gears. One housing is used for 40-45 driven tooth gears. The other is used for 34-39 driven gears. Check the housing part number and tooth color. Check drive gear. Check for broken or missing teeth.
No part numbers on the gear housing. The driven gear is red and the drive gear looks to be red also although it could be the trans fluid on it. Could be brown.
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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

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Old 04-21-2013, 11:24 AM   #4
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Re: 700r4 question

By gear housing youmean the piece that goes into the side of the trans that the gear fits in I assume.
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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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Old 04-21-2013, 01:39 PM   #5
77c10
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Re: 700r4 question

I have the wrong housing for my gear. Ordered a new one off Ebay this morning. Hopefully this will fix it!
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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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