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Old 11-21-2006, 11:36 PM
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T-350 trans to electric speedometer?

I have an 87 firebird and I would like to keep the original speedometer. I have th350 transmission which is mechanical. Can I convert the mechanical spot on the transmission into an electric plug for my speedometer? If I can what do I need to buy to do it. I read something about a sender unit but I don't know what one to buy or if there is another name for them.
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Old 11-22-2006, 12:10 AM
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Quote:
Originally Posted by Hero2112
I have an 87 firebird and I would like to keep the original speedometer. I have th350 transmission which is mechanical. Can I convert the mechanical spot on the transmission into an electric plug for my speedometer? If I can what do I need to buy to do it. I read something about a sender unit but I don't know what one to buy or if there is another name for them.
I have a similar problem in that I have a TH400 that I need to get an electronic signal from...someone must make an analog to digital converter that would mount at the speedo output on the trans...?

I'll bet someone out there has done this...
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Old 11-22-2006, 12:58 AM
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Well I found this http://www.terf.com/SpeedChangerMechanicalPage.htm but it's very costly. I was trying to find something like this on ebay but no luck. I've been looking on google for hours and haven't gotten any closer.
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Old 11-22-2006, 11:41 AM
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Quote:
Originally Posted by Hero2112
Well I found this http://www.terf.com/SpeedChangerMechanicalPage.htm but it's very costly. I was trying to find something like this on ebay but no luck. I've been looking on google for hours and haven't gotten any closer.
I think this unit is backwards...I believe it lets you run an electronic transimission signal to a mechanical gauge

Quote:
Rugged Output Drives Virtually Any Mechanical Speedometer!
What we need is the reverse a mechanical (analog) to digital converter...
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Old 11-22-2006, 07:01 PM
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try here

these guys have what your looking for I believe..



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

After posting I realized your working with a TH350. I'd call them and I bet they could point you in the right direction..

Last edited by DV8; 11-22-2006 at 07:06 PM.
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Old 11-22-2006, 09:43 PM
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Well what i need now is a th350 electric Speedometer gear housing... that dosen't exist so I guess I'm just going to buy an after market speedometer.
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Old 11-22-2006, 09:45 PM
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Quote:
Originally Posted by DV8
these guys have what your looking for I believe..



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

After posting I realized your working with a TH350. I'd call them and I bet they could point you in the right direction..
Quote:
Are you refering to the Cable X product?

Looks like this is backwards - this takes an electronic signal and converts the ouput to mechanical via the drive box noted in their picture.

TH350/TH400 we need the reverse - a mechanical to electrical converter to get the needed VSS signal to drive the modern gauges.
Whoops! I scrolled down the page farther and found the piece for the TH400

#64. Speed Sensor and Rotor (speedometer VSS) for the TH400 transmission. Cost $208.00 for both. Speed sensor $125.00. Rotor $83.00

Cool - I'll call them and my transmission guy to see if this might work for me.

Others must make items like this for both the Th350/Th400 - I'll keep digging as well...

Last edited by Rambo_The_Dog; 11-22-2006 at 09:50 PM.
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Old 11-22-2006, 10:02 PM
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OK Here we go....

Under $50.00!!

I think this is the GM one we need - I'll have to contact them to make sure but I bet this should do the trick for both of us!

Dakota Digital Speedometer 8k Pulse Generator

SEN-01-1 - 8K pulse generator with adaptor cable for GM transmissions with cable drive speed output.

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Old 11-22-2006, 10:08 PM
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edit... woops thats not right.... Its just going to be cheaper to get a mechanical speedometer. To make it show the correct speed I'll Just need to get a new drive gear.
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Old 11-22-2006, 10:28 PM
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Quote:
Originally Posted by Hero2112
edit... woops thats not right.... Its just going to be cheaper to get a mechanical speedometer. To make it show the correct speed I'll Just need to get a new drive gear.
Your electronic speedo should be controlled by a VSS signal which is what this adapter generates...

You can get a mechanical speedo for under 50.00? Or are you thinking this adapter won't work?
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Old 11-22-2006, 10:47 PM
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Quote:
Originally Posted by Rambo_The_Dog
Your electronic speedo should be controlled by a VSS signal which is what this adapter generates...

You can get a mechanical speedo for under 50.00? Or are you thinking this adapter won't work?

I would like to keep the original speedometer and finding a cheap mechanical one is going to be hard... most likely going to have to go to the junk yard. If I was sure that the adapter was going to work I would buy it today.
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Old 11-23-2006, 12:37 AM
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Quote:
Originally Posted by Hero2112
I would like to keep the original speedometer and finding a cheap mechanical one is going to be hard... most likely going to have to go to the junk yard. If I was sure that the adapter was going to work I would buy it today.
I really do think this adapter could work for you.

I'd send Dakota Digital an email and call their tech support to tell them your plans and hardware - they should be able to tell you exactly what you need.

I've done this with several of my vendors/sponsors like Autoloc and Defi and have gotten some good information - whether I buy their products or not
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Old 02-11-2009, 08:34 AM
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i have a 1995 chevy truck with a 350 trans and the same problem with the speedometer. i emailed dakota digital and this is the link they sent me.

http://www.jagsthatrun.com/Pages/Par...ctor-Diff.html

the guy said its universal. hope this helps
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Old 02-25-2011, 12:32 AM
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by's your close but you don't need to change any internals in the transmission. any mechanical speedometer can be easily changed into an electronic speedometer, all you need is to remove the speedometer cable and use a electronic speedometer sender, 2 links off the top of my head with them are http://www.speedhut.com/product_deta...NUMBER-722.htm ,http://performanceparts.com/part.php?partID=38945 , can also be bought from any auter meter dealer or from a gm dealer. i've used those products before on a 75 trans am witch had a mechanical speedo but i swapped out the gauges to auto meter gauges, plus i live in canada and could only get a metric speedo in an electronic one. should solve the problem
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