700r4 Speedmeter Help!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

aboyer · 04-01-2009, 07:11 PM

I purchased a used 700r4 transmission for my truck and had it rebuilt by a professional shop. Since it was my first time installing it in the truck, I wanted to get the correct plastic speedo gears to have a correctly reading speedometer.

I recently purchased the correct plastic gears and have found that my transmission might have been used in an electronic speedo? Can someone look at this picture and tell me if I am on the right path? From what I can tell, you can't remove this metal gear.

Is there any way to convert this to work with the speedo cable on my truck? I already spent a ton on the rebuild and I would like to get the speedo to work correctly.

Thanks,

Adam

**425HP409** · 04-13-2009, 01:42 PM

That gear is pressed in place on the output shaft. You can drive it off to the rear of the shaft and there should be a hole in the shaft that holds the clip for the plastic speedometer drive gear. Any other questions call me at 972-335-9823
l

70GMCer · 04-13-2009, 03:00 PM

Maybe this can help.....

Skirkpat · 04-13-2009, 03:16 PM

I am in the same boat, I thought that I could get an electronic Speedo that would hook up to it?

Wrenchbender Ret · 04-13-2009, 03:54 PM

Like 409 says that relucter can be taken off & a plastic speedo gear put on but you should check the rear houseing & see if the housing for the driven gear will fit & mesh right. You may have to get a different rear tail housing. I know that is the way it is on the T-5 manual trans.

cparman · 04-13-2009, 05:00 PM

425HP is correct. there should be a small clip that holds the drive gear to the output shaft. I had a 700 in my 67 Chevelle, and could not find the right combination for it. I took the car to a speedometer shop here in Jax FL, and Chris made me a reducer that attaches to the driven gear housing. The reducer screws onto where the speedo cable would go, and the speedo cable attaches the reducer. It cost about $100 bucks, but I knew I was going 100 when I was. This might be an easier way to make you speedo read correct

aboyer · 04-13-2009, 10:03 PM

I was going to update everyone, but you beat me to it. I purchased a 8 inch gear pulley and was able to pull the metal gear ring out.

Once I had the metal gear ring our, I slid my plastic ring get over the shaft and clipped it in with the small clip. Everything is working fine now, but when I first saw it, I wasn't sure what the next step was.

Thanks again!

04-01-2009, 07:11 PM	#1
aboyer Adam B Join Date: Jul 2005 Location: Westfield Posts: 151	700r4 Speedmeter Help!! I purchased a used 700r4 transmission for my truck and had it rebuilt by a professional shop. Since it was my first time installing it in the truck, I wanted to get the correct plastic speedo gears to have a correctly reading speedometer. I recently purchased the correct plastic gears and have found that my transmission might have been used in an electronic speedo? Can someone look at this picture and tell me if I am on the right path? From what I can tell, you can't remove this metal gear. Is there any way to convert this to work with the speedo cable on my truck? I already spent a ton on the rebuild and I would like to get the speedo to work correctly. Thanks, Adam Attached Images

04-13-2009, 01:42 PM	#2
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Re: 700r4 Speedmeter Help!! That gear is pressed in place on the output shaft. You can drive it off to the rear of the shaft and there should be a hole in the shaft that holds the clip for the plastic speedometer drive gear. Any other questions call me at 972-335-9823 l

04-13-2009, 03:00 PM	#3
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: 700r4 Speedmeter Help!! Maybe this can help..... Attached Images __________________ 1997 GMC Sierra Ext 1965 Mustang

04-13-2009, 03:16 PM	#4
Skirkpat Registered User Join Date: Dec 2008 Location: K.C. Missouri Posts: 1,024	Re: 700r4 Speedmeter Help!! I am in the same boat, I thought that I could get an electronic Speedo that would hook up to it?

04-13-2009, 03:54 PM	#5
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: 700r4 Speedmeter Help!! Like 409 says that relucter can be taken off & a plastic speedo gear put on but you should check the rear houseing & see if the housing for the driven gear will fit & mesh right. You may have to get a different rear tail housing. I know that is the way it is on the T-5 manual trans.

04-13-2009, 05:00 PM	#6
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: 700r4 Speedmeter Help!! 425HP is correct. there should be a small clip that holds the drive gear to the output shaft. I had a 700 in my 67 Chevelle, and could not find the right combination for it. I took the car to a speedometer shop here in Jax FL, and Chris made me a reducer that attaches to the driven gear housing. The reducer screws onto where the speedo cable would go, and the speedo cable attaches the reducer. It cost about $100 bucks, but I knew I was going 100 when I was. This might be an easier way to make you speedo read correct

04-13-2009, 10:03 PM	#7
aboyer Adam B Join Date: Jul 2005 Location: Westfield Posts: 151	Re: 700r4 Speedmeter Help!! I was going to update everyone, but you beat me to it. I purchased a 8 inch gear pulley and was able to pull the metal gear ring out. Once I had the metal gear ring our, I slid my plastic ring get over the shaft and clipped it in with the small clip. Everything is working fine now, but when I first saw it, I wasn't sure what the next step was. Thanks again!



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