Custom Shifter: Need Thread Size.

[240nspec]

Will be making/turning a Shifter handle on the lathe today, if I had the car here I'd look for the sizes myself; however, its in storage..

Anyways, anyone know the specs on the thread pitch/dia?

Could it be M10x1.25?

thanks guys.

Also Depth of insert (Depth in which the actual shifter goes into the factory knob)

Would be a GREAT thing to know Anyone care to bust out a caliper or ruler?

[H8tred]

I'll measure mine tonight, I'm putting a new clutch and flywheel in, here in an hour or two actually. I'll see if anyone has thread gauges at work, if so I'll get the thread pitch and all for you as well. I want a free knob though damn it

[H8tred]

Doing a transmission by your lonesome is a pain in the ***... The best number I can get you is 11 x 1.75. Half the pieces to the tap and die set are missing, and 12 x 1.75 is just a little loose. The shifter itself has about 20mm of thread, and the knob is about 71mm deep.

[qat727]

I have been putting off making my own shift knob for some time now, but you gave me a reason to go do the necessary research. I don't have a stock shift knob to measure, so I took good dimensions of the shifter in my car. It's out of a 89 240SX if it matters to you.

There are two tapered steps in the shifter. One is at the lowest exposed point where the boot sets. That shaft is 0.55" in diameter and extends 2.6" to the taper between the two diameters. The taper is about 0.2" tall. After the middle taper, you reach the section where the threads are. The threads take up 0.8", and the total length from the top of the shifter to the top of the taper is 0.9".

The pitch is definitely 1.25. I measured an OD of .390" on the threads, which is close to M10.

There are some SAE sizes that are closer to that diameter, but none that match the 1.25 pitch. My tap and die sets don't have a M10x1.25 die, nor does my pocket ref mention it as a standard tap, so unfortunately I can't check what the nominal dimensions should be if it is M10x1.25. That said, I do suspect it is M10x1.25.

If you need any other dimensions, let me know.

[H8tred]

All the m10s I tried were too small to even start on the shaft. The .25 most likely is contributing to the looseness, but I still feel like it's an M11. Oh, I just finished at 6 am, started at 8. I couldn't get the input shaft in to save my damn life, not to mention I was laying on my back with the transmission on my chest. Worst transmission swap ever bar none.

[qat727]

All the m10s I tried were too small to even start on the shaft. The .25 most likely is contributing to the looseness, but I still feel like it's an M11.

There is the off chance yours might be. I was going off of the relative abundance and size. M10x1.25 is more common than M11x1.25. Also, M10 calculates out to .394" diameter, and M11 calculates out to .433" I was trying to read my caliper with a flashlight, so it's possible I lost .004". I'll try to grab a M10x1.25 nut from the store to verify for sure what mine is. I'm interested to find out if yours is actually different.

[H8tred]

I doubt they are. Like I said, I was in the middle of a heated "I need to fix this now so I can go home and get some sleep" transmission swap. My measurments were quick and dirty. We had some M10s that I tried, I don't remember the pitch though. We didn't have any M11s though, like you said, it's a fairly uncommon size.

Everything I see online is 10 x 1.25.

[DjPantsSpecR]

i've made many shift knobs.... its an m10x1.25

[240nspec]

Hey guys, just wanted to say thanks for everything. Once I get back in the shop, ill give r' a try. and qat thanks a bunch for the taper dimensions,

Much appreciated,

240nspec

[s73]

so its m10-1.25 for sure? Thanks for the info

Cool....i have some honda knobs that is m10-1.5...you think i can re-tap the threads to 1.25? or u guys think there may not be enough meat on the threads?

[qat727]

Hey guys, just wanted to say thanks for everything. Once I get back in the shop, ill give r' a try. and qat thanks a bunch for the taper dimensions,

Much appreciated,

240nspec

No problem. Glad to help.

i have some honda knobs that is m10-1.5...you think i can re-tap the threads to 1.25? or u guys think there may not be enough meat on the threads?

For it to be strong enough for me to trust with a load, it wouldn't come close to having enough meat to retap at a different pitch but the same diameter. That said, we're talking about a shift knob, and a lot of manufacturers don't even thread the knobs, they just let the shifter threads cut into the nylon insert in the knob. Considering that, I think you could get away with cutting 1.25 pitch threads in the knob, and if it did strip totally out, either fill it with JB weld and hit it again, or just bore it out some more and glue something like a 9mm ID nylon insert in.