[Scarebird]

One of the issues that bothered me was how to mount the MAF mount. It has two threaded holes but nothing else. Bolting it in was a no-go - if the screws come loose that is bad news! Eventually I figured out rivets are the way to go here.

Two ways I can see to do this. One is simply buy long rivets, the other is to drill and counterbore. That is the path I took.

First you need to cut open a rectangular hole for the sensor. I use an angle grinder with cut off wheel. Not the best as it is not a clean hole and the cutting disc can load up with aluminum.
File work will clean this up.



Time to drill and counterbore. Rivets required about 3/16" of material to fall into grip range.



Rivet tool would not reach into hole so washers were stacked till flush plus a bit more.

Make sure mount is clocked the correct way - the blade style only flow one way.



Test fitting in engine compartment. I will use sealant around the perimeter of the mount - no leaks here! Pipe will be scotchbrited then cleared after sealant dries.

I hope there are better mounts that already have mounting hole and rivets ready to go...

[Scott Roberts]

Originally Posted by Scarebird

One of the issues that bothered me was how to mount the MAF mount. It has two threaded holes but nothing else. Bolting it in was a no-go - if the screws come loose that is bad news! Eventually I figured out rivets are the way to go here.

Two ways I can see to do this. One is simply buy long rivets, the other is to drill and counterbore. That is the path I took.

First you need to cut open a rectangular hole for the sensor. I use an angle grinder with cut off wheel. Not the best as it is not a clean hole and the cutting disc can load up with aluminum.
File work will clean this up.



Time to drill and counterbore. Rivets required about 3/16" of material to fall into grip range.



Rivet tool would not reach into hole so washers were stacked till flush plus a bit more.

Make sure mount is clocked the correct way - the blade style only flow one way.



Test fitting in engine compartment. I will use sealant around the perimeter of the mount - no leaks here! Pipe will be scotchbrited then cleared after sealant dries.

I hope there are better mounts that already have mounting hole and rivets ready to go...

Very impressive work!

[Scarebird]

The VSS issue. To recap earlier GM's, roughly mid 80's to early teens had a pulse type 2 wire VSS. If you buy a Tremec that is what they come with. Unfortunately mid-Teen and later GM's use a PCM that requires a Hall Effect transducer; a 3 wire sender. To my knowledge Tremec does not make a sensor for this. Later Fords also are 3 wire.

After scanning rockauto I selected a 2015-2022 Canyon VSS; it looked like it was the correct unit (GM 84427801).

wrong.

As you see it is a bit shorter (0.085") and narrower (0.940" vs 0.740").



I hung onto it too long and cannot return it. They run around $45. So I cut off the mounting ear and trimmed the mount section to match the barrel at 0.740". Amazingly it did not come apart. So I grabbed a piece of scrap round stock and made a top-hat shaped adapter, O-ring groove included.



The O-ring needs 0.100 deep groove, but the wall is only 0.100" thick so the groove is 0.65" deep and the O-ring is trimmed down a bit. No doubt lots of grease will be needed here!

The Tremec VSS mount tab was removed and now holds the Canyon unit, should work fine.

[Scarebird]

There are other options.

Mitch at Swap Time says some run this without the VSS. If you are running a LT1 (2016-2022) and a transmission that does NOT have a VSS port some will ignore it and run a cable driven speedo - a customer of his was running a TH400 that way. The PCM likes to see a speed for whatever reasons it has.

Option "B" would be this:



This also is a 2015-2019 Canyon unit - I do not know what/why they are different.
Being longer and narrower may make this a better choice - not sure on connector availability... but it looks like no trimming of the sensor is needed - just a sleeve.

Option "C" is what I should have done first, which would be to call Holley (where I bought it) and see what they say.

Option "D" is Dakota Digital's pass thru VSS. Essentially you put this little widget between the trans and speedo cable. Neat. According to the DD tech it only generates a 8k/mile signal - not what the PCM is looking for, but if not used for speedo calibration no issue and it may work there too anyway (yes Mr. PCM I have reaaaallly tall gears... why do you ask?).

[gtospieg]

I agree but I may not keep the 2.56's....also there is a T-10 with 3.42 1st gear...