How to properly drill and tap a transmission for a slider

[Deleted]

Is there a thread already on this? I'll be doing it when it comes time, and I just want a basic idea on how to do it

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[jackedup]

The one time I can honestly say this is easier done than said. If your doing a TH350 You need a drill, drill bit (Q), a tap(3/8-24) and a tap handle. I made a little drill bushing jig that slides on instead of a driveshaft but it isn't really needed if you have a drill press. Th400 are usually already tapped to 1/2-20.

[Deleted]

It's actually a Ford tranny lol.. I heard they were harder than Chevys

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[Punisher 66J]

What do you actually tap the drive shaft I am guessing, I have never had a slider and never have seen one put in.

[jackedup]

I spoke to Brian Nerat and he said if your using a drill press a layer of grease around your output shaft seal keeps the metal shavings out of your transmission nicely. Hope this helps.

[jackedup]

Dec 3, 2013 17:35:38 GMT -5 Punisher 66J said:

What do you actually tap the drive shaft I am guessing, I have never had a slider and never have seen one put in.

You tap the output shaft on the transmission so you can bolt the yoke directly to your trans.

[jackedup]

Dec 3, 2013 17:28:24 GMT -5 @regulator214 said:

It's actually a Ford tranny lol.. I heard they were harder than Chevys

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Get a good drill bit (not one of those ones laying around the shop that has been through hell) use slow rpm, and make sure you use plenty of cutting oil. If it starts getting hot take a break and do something else for a bit. If you work harden that output shaft you'll have a heck of a time getting it drilled. As for the Ford yoke, measure the hole in your one piece yoke and if its 3/8" or 7/16" use a 3/8-24 tap if its 1/2" or bigger use a 29/64 drill bit and a 1/2-20 tap.

[jackedup]

Def of good drill bit. (If it came in a cheap set or form walmart its not good). A $4-8 drill bit will pay for itself when your doing things like this. Don't be fooled by titles like "Titanium" for all we know they used a titanium colored paint to dip them in. The quality will be in the price and brand of bit not in the fancy packaging.

[lincoln]

Make sure you drill it straight. Seen crooked drilled holes break tail shafts.

[Deleted]

Sweet, okay, thanks jackedup!

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[rhull1977]

Certain ford tail shafts are almost impossible to drill no matter what drill bit you have almost need to be set up in a mill or lathe

[Deleted]

There's a lathe at school lol, but I probably can't or wouldn't even be allowed to use it for that lol

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[jackedup]

Dec 3, 2013 21:43:39 GMT -5 rhull1977 said:

Certain ford tail shafts are almost impossible to drill no matter what drill bit you have almost need to be set up in a mill or lathe

Not trying to be a smart @$$ or anything but car to explain the difference in drills and taps between a drill press and a lathe?

[mckinnon45]

I fixtured the whole transmission (chevy 3 speed) upside down in a drill press. Put in 1st gear, and locked input shaft. Use solid carbide drill bit that is the size of the bolt you are going to use (IE if you want 1/2" bolt, use 1/2" bit) (to break through the case hardening) with Tap Magic at 500 RPM and all the pressure you can apply. This part takes about 1-2 seconds with a solid carbide bit. Never made it even scratch the surface with a regular bit.

Once through the case hardened portion, stop and step down a size. I went with 3/8" bolt, so I went through the case hardening with a 3/8 bit, and continued with a 5/16 drill bit. Then tapped with a 3/8-16 tap. Piece of candy

[rhull1977]

With a mill or a lathe you can use fluted cutters that are designed to cut harden steel and not burn up a bit trying to cut through