What is the correct speedometer to use??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lyrikz · 01-24-2010, 06:22 PM

My truck is a 71. The transmission is a th400. I didnt even think about it until today when i went to hook it up. Its different on the transmission. I did some searches and really didnt find anything. What cable do you use.?

67ChevyRedneck · 01-24-2010, 06:34 PM

??? It is? I used an 83 Firebird 700R4 and even that was a direct "screw on." What's different?

lyrikz · 01-24-2010, 06:36 PM

Quote:

Originally Posted by 67ChevyRedneck

??? It is? I used an 83 Firebird 700R4 and even that was a direct "screw on." What's different?

The little square cable on the inside is smaller then the one INSIDE the th400..

My truck was an inline six with 3 speed saginaw in it. Then i put the th400 and 454 in...

67ChevyRedneck · 01-24-2010, 06:38 PM

Weeeeeeeird! I know there are different lengths for these trucks. Not sure if there was a different end used on the cables?

lyrikz · 01-24-2010, 06:40 PM

The length is ok. I just looks like the square is ALOT smaller then the square in the tranny.. Just spins inside it.

johndawelder · 01-24-2010, 09:17 PM

Duct tape maybe ???? Never seen one with a bigger square hole in it.

lyrikz · 01-24-2010, 09:53 PM

Quote:

Originally Posted by johndawelder

Duct tape maybe ???? Never seen one with a bigger square hole in it.

No, it screws on but the center square just looks alot bigger on the housing... Any thoughts?

AirSpeed · 01-24-2010, 09:57 PM

I bought a replacement cable for my 69 a while back, it was just the inner cable. It came with two crimp on adapters, a small and a large square end piece. Maybe you could go to a parts store and see if they are still available like that, you could just replace the inner cable?

msgross · 01-24-2010, 09:57 PM

a place like this might be able to help..

http://www.transmissioncenter.net/sp...n_______va.htm

lyrikz · 01-24-2010, 11:58 PM

i will call a few tranny shops tomorrow and see what they have to say.. I think it would be as simple as sliding a bigger square on the smaller square. lol...

jabraham17 · 01-25-2010, 10:40 AM

Is the driven gear on the trans stripped? this would make it seem too big. I have seen this before on used trans when the speedo or cable (on the previous vehicle) seized up, then that made the plastic gear in the trans break or strip. Just a thought.

lyrikz · 01-25-2010, 10:52 AM

Quote:

Originally Posted by jabraham17

Is the driven gear on the trans stripped? this would make it seem too big. I have seen this before on used trans when the speedo or cable (on the previous vehicle) seized up, then that made the plastic gear in the trans break or strip. Just a thought.

Nope, its all new. Just seems to big. Im going to call that trans place right now. One second.
it appears that the square starts off bigger then tapers down smaller... We will see.

01-24-2010, 06:22 PM	#1
lyrikz PITbut Join Date: Sep 2007 Location: monroe washington Posts: 3,052	What is the correct speedometer to use??? My truck is a 71. The transmission is a th400. I didnt even think about it until today when i went to hook it up. Its different on the transmission. I did some searches and really didnt find anything. What cable do you use.? __________________ New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel *DONE! SOLD!* My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold.

01-24-2010, 06:34 PM	#2
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: What is the correct speedometer to use??? ??? It is? I used an 83 Firebird 700R4 and even that was a direct "screw on." What's different? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-24-2010, 06:38 PM	#4
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: What is the correct speedometer to use??? Weeeeeeeird! I know there are different lengths for these trucks. Not sure if there was a different end used on the cables? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 01-24-2010 at 06:41 PM.

01-24-2010, 06:40 PM	#5
lyrikz PITbut Join Date: Sep 2007 Location: monroe washington Posts: 3,052	Re: What is the correct speedometer to use??? The length is ok. I just looks like the square is ALOT smaller then the square in the tranny.. Just spins inside it. __________________ New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel *DONE! SOLD!* My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold.

01-24-2010, 09:17 PM	#6
johndawelder Registered User Join Date: Jan 2010 Location: Loudon,TN Posts: 101	Re: What is the correct speedometer to use??? Duct tape maybe ???? Never seen one with a bigger square hole in it.

01-24-2010, 09:57 PM	#8
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: What is the correct speedometer to use??? I bought a replacement cable for my 69 a while back, it was just the inner cable. It came with two crimp on adapters, a small and a large square end piece. Maybe you could go to a parts store and see if they are still available like that, you could just replace the inner cable?

01-24-2010, 09:57 PM	#9
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: What is the correct speedometer to use??? a place like this might be able to help.. http://www.transmissioncenter.net/sp...n_______va.htm __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

01-24-2010, 11:58 PM	#10
lyrikz PITbut Join Date: Sep 2007 Location: monroe washington Posts: 3,052	Re: What is the correct speedometer to use??? i will call a few tranny shops tomorrow and see what they have to say.. I think it would be as simple as sliding a bigger square on the smaller square. lol... __________________ New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel *DONE! SOLD!* My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold.

01-25-2010, 10:40 AM	#11
jabraham17 Registered User Join Date: Oct 2009 Location: Cambria, MN Posts: 8	Re: What is the correct speedometer to use??? Is the driven gear on the trans stripped? this would make it seem too big. I have seen this before on used trans when the speedo or cable (on the previous vehicle) seized up, then that made the plastic gear in the trans break or strip. Just a thought.

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