700r4 electronic speedometer conversion to mechanical speedometer - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-12-2012, 05:54 PM
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700r4 electronic speedometer conversion to mechanical speedometer

What is the simple solution to using an original 57 chevy cable speedometer with a R700 trans. that has an electronic speedometer on the tailshaft??

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Old 02-12-2012, 07:06 PM
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You unbolt and remove the tail housing. There is a round disc (reluctor wheel) with notches on the out put shaft. Remove that disc. Should be holes in the output shaft, the disc covered.

Then you simply install the mechanical speed-O parts. Use the front hole on the output shaft for the retaining clip for the plastic speed-O gear.


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Old 02-13-2012, 02:02 AM
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Be aware that the vast majority of output shafts with reluctors pressed on them are drilled to accept the tab on a speedometer clip. However, I have found a few shafts that did not have a hole for the clip. If you find one without the hole, you must replace the shaft.
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Old 02-14-2012, 06:26 AM
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You can find the cover w/the o ring around it (it can't think of what its called) for larger speedo gears on older 3/4 ton Chevy p/u's that have 700r4's still in them.(42,43,44 tooth count) Also on 86-92 Z28,but bring a stiff brush to get gerase/dirt mix off and look at the numbers on the cover thing.700r4's only not on 4l60e's.
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Old 02-23-2012, 12:48 AM
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so, let me get this right, you can not change a 4l60e over to manual speedo cable but you can a 700r4?
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Old 02-23-2012, 06:52 AM
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nine4gmc...you are correct
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Old 07-09-2012, 07:35 AM
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1985 chevy truck turbo 350 being replaced by 700r4

if i understand this correctly i have to take off the tailshaft housing of the turbo 350 and put and the speedo componets and the 350 tailshaft housing on the 700r4 ?

Last edited by majic1on1; 07-09-2012 at 07:51 AM.
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Old 07-10-2012, 06:49 PM
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Quote:
Originally Posted by majic1on1 View Post
if i understand this correctly i have to take off the tailshaft housing of the turbo 350 and put and the speedo componets and the 350 tailshaft housing on the 700r4 ?

The 700 trans needs the correct speed-O parts and tail housing for the 700.

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Old 07-11-2012, 08:18 AM
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There's a thread over at LS1Tech in the "hybrids and conversions" section about a new solution that's about to come to fruition (no, I'm not involved in any way). This is a small programmable stepper motor that screws into the back of the factory speedo head, takes the electronic signal and converts it to the rotary motion that the head requires.

Russ
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Old 07-11-2012, 11:30 PM
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thanks a lot for posting this picture i was able to buy all new parts at a transimission supply house for les than 25 dolars. only catch is i broke the tab off of the clip ... but i can get another one of those.. thanks again to everyone who posted on this subject...we will have the tranny put in by the end of the day tomorrow.. i cant wait to see if i get improved milage from havin a 4 speed tranny in my 1985 chevy pick up project .......majic1on1
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