4L80E speed sensors

[Nasty-Z]

If you have a 91-93 L80 4WD truck and PCM, and you are trying to use an aprox 94 with the OSS ring missing. If this is the case, you should consider a few facts. I know of no work around for a 95 4L80-E with no OSS ring in a 91-93 where the PCM needs the OSS signal.

The work around is in post #14 above , use the VSS on the T case for both the input to the DRAC and for the TOSS input into the '7060. Works flawlessly.

For the record , I did not know this would work and was hesitant to try it , but it sure beat removing the trans and tearing it apart to install the reluctor ring. Glad I tried and verified that it could and would work.

Just because I am so curious though , can you explain in terms that I can understand why we cannot (or should I say should not) interchange the early (91-93) and the later 94 and up 4L80E transmissions ? I ran a 1995 model 4L80E in my '92 454SS for years with the '7060 with no problems whatsoever before I switched over to the '7427 , my 93 K3500 has a 96 model 4L80E , again with many many miles and no indication of a problem with the '7060 controlling it before I switched to the '7427. This truck that the original post was about is a 1992 model year also , again with a 1995 model 4L80E in it now with a '7060 controlling it.

I would just like to understand why this is frowned on if all works as intended . I am at a loss as to what would be so drastically different that the model years should not be interchanged .

Thanks

TOM

[billygraves]

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