The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-21-2013, 10:03 AM   #1
77c10
Registered User
 
77c10's Avatar
 
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"
77c10 is offline   Reply With Quote
Old 04-21-2013, 11:01 AM   #2
gchemist
BAD BOW-Silverado XST
 
gchemist's Avatar
 
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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.
__________________
Gerardo a.k.a. Mad Chemist
Silverado XST videos
gchemist is offline   Reply With Quote
Old 04-21-2013, 11:24 AM   #3
77c10
Registered User
 
77c10's Avatar
 
Join Date: Aug 2011
Location: Gallatin, TN
Posts: 782
Re: 700r4 question

By gear housing youmean the piece that goes into the side of the trans that the gear fits in I assume.
__________________
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"
77c10 is offline   Reply With Quote
Old 04-21-2013, 12:23 PM   #4
77c10
Registered User
 
77c10's Avatar
 
Join Date: Aug 2011
Location: Gallatin, TN
Posts: 782
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.
__________________
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"
77c10 is offline   Reply With Quote
Old 04-21-2013, 01:39 PM   #5
77c10
Registered User
 
77c10's Avatar
 
Join Date: Aug 2011
Location: Gallatin, TN
Posts: 782
Re: 700r4 question

I have the wrong housing for my gear. Ordered a new one off Ebay this morning. Hopefully this will fix it!
__________________
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"
77c10 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:21 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com