Hi Folks.

The time has come for another trans rebuild. Truck is 2001 4.0 4x4 w/ the Mazda M5R1hd trans. Currently running the trans that came with it off the factory line, but have a 2006 M5R1 in need of a new mainshaft. I twisted the mainshaft after my new engine installation as well as cracked the transfer case in half. I want to fix this trans and install it, giving me nearly no downtime.

I'm curious if there is a way to relocate my speed sensor trigger from the trans tailhousing to the rear axle like in previous years...and giving me accurate speed readings. I'm asking this because locating a 2001+ 4x4 mainshaft is next to impossible. Every source I've checked into specifically state the mainshaft they have does not work with the tailshaft sensor. Availability of the 98-00 4x4 mainshaft is much easier to locate and so are the tailhousings. What I'm getting at is running an older mainshaft.

I've spoken with a few transmission shops that mention they've seen the twisted or severed output before and they also relate it to the presence of that sensor. They can't seem to locate a mainshaft for me either.

If making this idea work involves computer tweaking, it's not an option on my table. I'll have to either locate a shaft, take my two trans to make one good one, or locate a good low mile used unit.

Thanks.

Shane

 

seems like the only way to do that is some computer changes? I cant see them both reading the same.

good luck on finding a low mile unit! never know

 

Thank you Mr. Beard.

I suppose the hunt continues!

 

Only thing I am thinking is that you could check and see what the signal output is from the tailshaft compared to the pig. If they were the same maybe you could just tap the tailshaft wiring into the pig sensor? Next issue would be will the abs still work? Or could you possibly fry the computer?

 

It is possible. I did it to accommodate my V8 swap.



My method involves adding a 98~00 RABS GEM and some wiring. The additional GEM is used only to handle the conversion from the RABS sensor pulse to something the speedometer can read. The frequency would need to be adjusted to the tire diameter (revs/mile) for accurate readings. This adjustment is relatively easy using a dealer tool but you'd have to find a tech/dealer willing and able to do it.


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Another option:

You MIGHT be able to use an aftermarket speedometer correction box to read the signal from the rear axle sensor and output directly to the speedometer. I believe that to be possible based on what certain advertisements say. However, I haven't tried it myself and ads are sometimes misleading.

The big advantage to an AM box is that it would be user adjustable. It also comes with wiring instructions.

Here's one that I've seen. Again, I don't know anything about it except what the website says:
TERF Inc. - SpeedChanger - Repairs Inaccuracies In Your Speedometer

 

Another aftermarket conversion module from Dakota Digital that looks promising:

Universal Speedometer Signal Interface

 

Thanks Bob. You've given me some ideas to look into. Thanks.


Found a 16k trans from a 2009 for $575 shipped.....but from Quebec. If there isn't any additional shipping fees, I may just jump on it and run it. Then piece together one good one and sell it off.