68 C10 Muncie M20 Project

[68 C10 Driver]

Ok, I know there are threads on here regarding Muncie 4 Speeds in Pre-72 C10s, but those all tend to go off tangent into folks suggesting going with a T10 or a S10 5 Speed.

Here is what I need help with. I already have the M20. I have the reverse switch set up and I have an aluminum bellhousing to go with the M20. What I need to know is who has done this and can you share any photos showing what you have done (i.e. issues with driveshafts, yokes, speedometer cables, etc.)

I plan on converting to a hydraulic clutch that will utilize a slave piston. I have seen the hydraulic throw-out bearings, but I think for now I will use the slave piston and standard throw-out bearing fork. I hate having to deal with stretched out cables and I think the hydraulic clutch will make it easier for my wife to drive the truck if need be.

I also plan on using a rear transmission support. I know some on the forum have stated that just letting it hang off the bellhousing is ok, but by going to the aluminum car bellhousing that isn't supported like the old one was, the rear tranny support just makes sense and will help stabilize things better.

Pictures will be a huge help if you have them. Especially showing a measurement from the firewall/floor seam to the opening for the shifter.

Speaking of shifter, I will be using a Hurst Competition Plus shifter with the shifter control made for a bench seat. Please see the attached photo.

[68 C10 Driver]

As my truck cab is currently set-up, the opening for the shifter is 10 1/4 inches from the firewall/floor seam. Attached photo is a look at how it is currently placed.

Just FYI, this truck looked to have what was a Muncie 3 speed, so I don't know if thinks will line-up just right, or if I need to correct things. The old transmission was old, it was a modification that my late father-in-law did when he switched from the column shift 25-30 years ago. I will retain the floor shift in his honor, just working to figure it all out. I have also attached photos of the old 3 speed with the Dexion shifter supports...really jury rigged, I want to do things right.

[firedemon]

thats not jury rigged thats the way those crappy conversion shifters came .dont throw it away theyre getting harder to find someone will buy it

[Grumpy old man]

This thread may help . What side is your speedometer on your tail shaft ? I'm using the early tailshaft with the speedometer on the drivers side and using a 70 inch metal cased cable from Classic , Also the truck shifter .

https://67-72chevytrucks.com/vboard/...d.php?t=814944

[68 C10 Driver]

The speedometer is on the passenger side of the transmission which will mean I will have to use a longer speedometer cable. I will probably see if I can find one about 84 inches or so to accommodate the bend needed to connect it with out binding it.

[Grumpy old man]

Consider watching all the Muncie videos on the 5speeds.com site , There is a lot of info there on the Driven brand gear oil comparison and magnetic plugs . I'm using the Driven gear oil in mine and in my Posi rear differential with additive ,

[68 C10 Driver]

Originally Posted by Grumpy old man

Consider watching all the Muncie videos on the 5speeds.com site , There is a lot of info there on the Driven brand gear oil comparison and magnetic plugs . I'm using the Driven gear oil in mine and in my Posi rear differential with additive ,

Have you been happy with this brand? What is the viscosity? How is the transmission noise?

Sorry for all the questions. I was going to go with any GL-4 85w90, but I am very open to recommendations, especially from those who are recommending what they are using and not just read about.

Thanks!!