speedo calibration revisited - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigd65 · 02-05-2004, 06:16 PM

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 ?

**swervin ervin** · 02-05-2004, 08:22 PM

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.

gldevall · 02-05-2004, 11:11 PM

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?

**swervin ervin** · 02-06-2004, 12:17 AM

Here you go.

bigd65 · 02-06-2004, 11:37 AM

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.

gchemist · 02-06-2004, 01:46 PM

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.

gldevall · 02-07-2004, 02:50 PM

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.

gldevall · 02-07-2004, 02:59 PM

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.

**swervin ervin** · 02-07-2004, 03:37 PM

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.

gldevall · 02-07-2004, 05:33 PM

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.

jimfulco · 02-08-2004, 02:09 AM

These may be helpful

www.novaresource.org/speedo.htm
www.novaresource.org/speedo2.htm

02-05-2004, 08:22 PM	#2
swervin ervin You get what you pay for 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

02-05-2004, 11:11 PM	#3
gldevall Registered User 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

02-06-2004, 12:17 AM	#4
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Here you go. __________________ Mike 1985 Chevy C-10

02-06-2004, 11:37 AM	#5
bigd65 Registered User Join Date: Mar 2000 Location: Lake Jackson, TX. Posts: 1,930	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 (Dark Spiral Gray)

02-06-2004, 01:46 PM	#6
gchemist BAD BOW-Silverado XST 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

02-05-2004, 06:16 PM	#1
bigd65 Registered User Join Date: Mar 2000 Location: Lake Jackson, TX. Posts: 1,930	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 (Dark Spiral Gray)

02-07-2004, 02:50 PM	#7
gldevall Registered User 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

02-07-2004, 02:59 PM	#8
gldevall Registered User 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

02-07-2004, 03:37 PM	#9
swervin ervin You get what you pay for 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.

02-07-2004, 05:33 PM	#10
gldevall Registered User 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

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



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