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 02-05-2004, 06:16 PM   #1
bigd65
Registered User
 
bigd65's Avatar
 
Join Date: Mar 2000
Location: Clute, TX.
Posts: 1,935
speedo calibration revisited

Mike you helped me before with this , i need help again.

I have 275/60R15 on 15x8 rims. rear is 3.42 gears with a 700R4 tranny.

Problem is, my sppedo cable went out and had to change it, it had been growling anyways. well the the reducer that goes between the tranny and the cable also went out, it froze up and does not turn. Anyways, i took it out and now my speedo is not reading correctly again. The reducer is a 1:.950 part #1565215.
I took t out because it is 95.00 bucks to replace and i said to #e!! with that. Well now i need to recalibrate the speedo again. what gears you think i need ?
__________________
2004 Silverado Crewcab
1972 Chevy Monte Carlo
2017 Chevy Tahoe
bigd65 is offline   Reply With Quote
Old 02-05-2004, 08:22 PM   #2
swervin ervin
You get what you pay for
 
swervin ervin's Avatar
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
Jeff, you really need to know what gears you have now and what sleeve you have. There are two different sleeves. 25512340 works with 34-39 driven gears. 25512339 works with 40-45 driven gears.

If you don't feel like pulling everything before getting the gears, at least pull the driven gear and sleeve to see what part number the sleeve is. Then we can go from there.
__________________
Mike

1985 Chevy C-10
swervin ervin is offline   Reply With Quote
Old 02-05-2004, 11:11 PM   #3
gldevall
Registered User
 
gldevall's Avatar
 
Join Date: Mar 2003
Location: Walker, LA
Posts: 2,925
I'm in the same boat now. What is this sleeve? While I'm putting the speedo cable in, I need to count the teeth on the drive and driven gear. Right?
__________________
Gary -1986 SWB: lowered 4/6, SOLD!!!
-Best 1/4 mile: 14.51 @ 91.01 MPH
-2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!!
-2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels
gldevall is offline   Reply With Quote
Old 02-06-2004, 12:17 AM   #4
swervin ervin
You get what you pay for
 
swervin ervin's Avatar
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
Here you go.
__________________
Mike

1985 Chevy C-10
swervin ervin is offline   Reply With Quote
Old 02-06-2004, 11:37 AM   #5
bigd65
Registered User
 
bigd65's Avatar
 
Join Date: Mar 2000
Location: Clute, TX.
Posts: 1,935
I will try the search. i bought the gears you told me to last time. well i guess i will have try the search on CHEVYTALK. i think that is where you were at the time.
__________________
2004 Silverado Crewcab
1972 Chevy Monte Carlo
2017 Chevy Tahoe
bigd65 is offline   Reply With Quote
Old 02-06-2004, 01:46 PM   #6
gchemist
BAD BOW-Silverado XST
 
gchemist's Avatar
 
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
Here is the link you need.
http://www.tciauto.com/tech_info/speedo_gears.htm
Just put in the info into the calculator. Just find a combo with that comes close to a whole number.
__________________
Gerardo a.k.a. Mad Chemist
Silverado XST videos
gchemist is offline   Reply With Quote
Old 02-07-2004, 02:50 PM   #7
gldevall
Registered User
 
gldevall's Avatar
 
Join Date: Mar 2003
Location: Walker, LA
Posts: 2,925
Shouldn't there be a locking clip on that sleeve? Where can I get one? I guess mine fell off somewhere. I think it looks like a fork that attaches to the tranny housing with a screw.
__________________
Gary -1986 SWB: lowered 4/6, SOLD!!!
-Best 1/4 mile: 14.51 @ 91.01 MPH
-2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!!
-2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels
gldevall is offline   Reply With Quote
Old 02-07-2004, 02:59 PM   #8
gldevall
Registered User
 
gldevall's Avatar
 
Join Date: Mar 2003
Location: Walker, LA
Posts: 2,925
Mike, How long was your original speedo cable? Mine is about 60" and the part # from your old website is about 10" too short. So, all years aren't the same. Just a heads up for other guys.
__________________
Gary -1986 SWB: lowered 4/6, SOLD!!!
-Best 1/4 mile: 14.51 @ 91.01 MPH
-2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!!
-2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels
gldevall is offline   Reply With Quote
Old 02-07-2004, 03:37 PM   #9
swervin ervin
You get what you pay for
 
swervin ervin's Avatar
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
Gary,

your cable must go all the way to the tranny. I just went out and measured my old stock cable and it was around 46". My cable has a junction right under the drivers feet instead of going straght to the tranny. Not sure why it does though.

And yes, there should be a piece holding the sleeve in. It is sort of horse shoe looking thing with one bolt holding it on. You might be able to get one at the dealer. Junkyard would have one for sure if you can find a truck with the tranny still in it.
swervin ervin is offline   Reply With Quote
Old 02-07-2004, 05:33 PM   #10
gldevall
Registered User
 
gldevall's Avatar
 
Join Date: Mar 2003
Location: Walker, LA
Posts: 2,925
Yeah, all of the computers showed it as a 2 piece cable, but it went from the speedo all the way to the trans. However, the good guys at O'Reilly got me what I need. In case anybody runs into this, the cable needed is a Pioneer CA-3002, $12.00. It's 63" long. Now I just have to get everything re-installed and find that little horseshoe thing and the bolt.
__________________
Gary -1986 SWB: lowered 4/6, SOLD!!!
-Best 1/4 mile: 14.51 @ 91.01 MPH
-2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!!
-2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels
gldevall is offline   Reply With Quote
Old 02-08-2004, 02:09 AM   #11
jimfulco
Registered User
 
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
These may be helpful

www.novaresource.org/speedo.htm
www.novaresource.org/speedo2.htm
jimfulco 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 11:20 PM.


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