700r4 electronic to mech speedo conv. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rlm316 · 03-10-2009, 01:59 PM

I could use some guidance here. I have a 700r4 with the elecrtonic speedo and I want to convert to mechanical. When I removed the tailshaft housing, there is a ring gear and some type of metal spacer or guard for the front yoke from the drive shaft. My question is are these pieces pressed on or is there another method of removal, and can it be retro-fitted with the plastic ring gear. Any help would be greatly appreciated.

Thanks, Lane

67ChevyRedneck · 03-10-2009, 02:09 PM

Read the info I posted in post #4 and check out the links. If you still have questions... feel free to ask.

http://67-72chevytrucks.com/vboard/s...ighlight=700R4

Nothing is pressed on. The plastic gear on the tailshaft is held on by a plastic clip and the gear thing on the side of the tailshaft housing unbolts and pulls right out.

I still need to do the stuff in the second link too... my speedo reads about 9% too slow and with the correct plastic gears, it should be dead on. My truck is a runner and I hate to take it back apart just to make the speedo correct, but you have a chance to do that now

**Chevy4Life** · 03-10-2009, 09:41 PM

The electronic metal ring (reluctor ring?) is pressed on and takes a special tool to pull. A plastic speedo gear will go on after you get that one off.

Jay

67ChevyRedneck · 03-10-2009, 09:45 PM

Quote:

Originally Posted by Chevy4Life

The electronic metal ring (reluctor ring?) is pressed on and takes a special tool to pull. A plastic speedo gear will go on after you get that one off.

Jay

Cool... learn something new every day!

**Chevy4Life** · 03-10-2009, 09:53 PM

Quote:

Originally Posted by 67ChevyRedneck

Cool... learn something new every day!

Yep. Me too.

A deep 2 jaw puller will work also if you can find one.

rlm316 · 03-11-2009, 07:24 AM

Thanks for the info. That is what it looked like but it is nice to be sure. You guys are the greatest. Thanks, Lane

**michael bustamante** · 03-11-2009, 11:26 AM

I did this also and its not as easy as it sounds. the electric reluctor gear on the shaft is a BEAR to take off. I didnt have access to the extra long puller that is needed so I had to "shimmy" the gear by hammer and extension a little bit at a time so as not to damage the shaft until I moved it enough to use the 8" puller to work it the rest of the way off. then to install the plastic gear I actually had to gently work it up the shaft by using a plastic hobby hammer. Patience!!!
Try heating the metal gear before working it off to expand it

mr48chev · 03-11-2009, 11:42 AM

Here is a link to pretty good info on speedometer gears and related pieces. http://www.transmissioncenter.net/sp...n_______va.htm

You should be able to buy and or order the pieces from your local Chevrolet dealer's parts counter but it helps to be armed with the info you need when you go.

03-10-2009, 01:59 PM	#1
rlm316 Registered User Join Date: Aug 2006 Location: Woodstown, NJ Posts: 669	700r4 electronic to mech speedo conv. I could use some guidance here. I have a 700r4 with the elecrtonic speedo and I want to convert to mechanical. When I removed the tailshaft housing, there is a ring gear and some type of metal spacer or guard for the front yoke from the drive shaft. My question is are these pieces pressed on or is there another method of removal, and can it be retro-fitted with the plastic ring gear. Any help would be greatly appreciated. Thanks, Lane

03-10-2009, 02:09 PM	#2
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: 700r4 electronic to mech speedo conv. Read the info I posted in post #4 and check out the links. If you still have questions... feel free to ask. http://67-72chevytrucks.com/vboard/s...ighlight=700R4 Nothing is pressed on. The plastic gear on the tailshaft is held on by a plastic clip and the gear thing on the side of the tailshaft housing unbolts and pulls right out. I still need to do the stuff in the second link too... my speedo reads about 9% too slow and with the correct plastic gears, it should be dead on. My truck is a runner and I hate to take it back apart just to make the speedo correct, but you have a chance to do that now __________________ 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; 03-10-2009 at 02:12 PM.

03-10-2009, 09:41 PM	#3
Chevy4Life Senior Member Join Date: Feb 2003 Location: Las Vegas, NV Posts: 750	Re: 700r4 electronic to mech speedo conv. The electronic metal ring (reluctor ring?) is pressed on and takes a special tool to pull. A plastic speedo gear will go on after you get that one off. Jay Last edited by Chevy4Life; 03-10-2009 at 09:42 PM.

03-11-2009, 07:24 AM	#6
rlm316 Registered User Join Date: Aug 2006 Location: Woodstown, NJ Posts: 669	Re: 700r4 electronic to mech speedo conv. Thanks for the info. That is what it looked like but it is nice to be sure. You guys are the greatest. Thanks, Lane

03-11-2009, 11:26 AM	#7
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,848	Re: 700r4 electronic to mech speedo conv. I did this also and its not as easy as it sounds. the electric reluctor gear on the shaft is a BEAR to take off. I didnt have access to the extra long puller that is needed so I had to "shimmy" the gear by hammer and extension a little bit at a time so as not to damage the shaft until I moved it enough to use the 8" puller to work it the rest of the way off. then to install the plastic gear I actually had to gently work it up the shaft by using a plastic hobby hammer. Patience!!! Try heating the metal gear before working it off to expand it __________________ 1967custom Last edited by michael bustamante; 03-11-2009 at 11:27 AM.

03-11-2009, 11:42 AM	#8
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,448	Re: 700r4 electronic to mech speedo conv. Here is a link to pretty good info on speedometer gears and related pieces. http://www.transmissioncenter.net/sp...n_______va.htm You should be able to buy and or order the pieces from your local Chevrolet dealer's parts counter but it helps to be armed with the info you need when you go.



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