Dana 18 Input Shaft/Gear Question

Does anyone happen to have details about the 10 spline Dana 18 Input shaft or gear? (Novak says it was used from '68-71 behind the Buick V6s).

In particular I'm looking for where the input shaft and input gear mesh: the diameter (outside and inside the toughs (that's probably bad terminology)), the general shape (involute or flat), width of the splines.

Thanks!

 

well i believe the t86aa is a 6 spline and the t14 is 10. Atleast the ones iv seen.

 

Yes, the T14

 

I've found this page (which is where I got the years and trans/tcase combo from): http://www.novak-adapt.com/knowledge/transfer_case_gears_grid.htm but it doesn't list measurements. Is there another page?

I also googled the gear numbers and couldn't find anything.

 

Novak's site has the gear numbers. You have to dig for them but they have a chart showing that info. They don't show the spline depth or pressure angles though

Why do you need this info? I might be able to help with depth and width of splines but not angles. This would be measurements from used gears however so understand there may be some variation from a new gear

 

Trying to sort out a Mitsu-jeep mix-mash thing. The tcase is a 1-1/4" intermediate shaft Dana 18 clone. Here's the mix-mash: it has a 30 tooth input gear and a 10 spline input shaft.

I am trying to determine if the Japanese input shaft would properly mate to a 18-8-50, 947382 (US 10 spline) input gear; or what would be involved to allow them to mate.

In the hopes of being able to swap in a US tcase (or its gearset) to make future parts easier, as well as to be able to find a cheaper used overdrive. Also, in general to be prepared on my options should my trans or tcase meet an unfortunate demise.

 

Might contact Herm as he developed an overdrive for the Mitsubishi so could probably answer all these questions

 

I'll gladly take the measurements off the used gears if you're willing. It'll be close enough to get the idea...

That's my back up plan. But if there is a gear match, or only a small mod needs to be done to the JP transmission to use a US tcase, then I'd like to keep my 4 speed. Also who knows if it'd just be trading one headache for another, for instance the trans has an integral bellhousing and I have no fab skills. The tcase and trans both appear to be in great shape and it would seem like a horrible waste until something breaks.

I asked him earlier this year when I first started looking at ODs, but he skipped over the specific difference between the Mitsu and US 10 spline. I kinda regret not re-asking for the details, but it seems like a common gear so I was hoping that someone in the community would happen to know its measurements before I bothered Herm again.

There's a guy on the 3b page, Galen, with a mixed Mitsu/US drivetrain. He didn't do the work himself, so he doesn't know specifics. If this is the case, then it implies that there is no functional difference between the Mitsu and US shaft to gear meshing. There could be something to explain why, like he's using pre-68ish Mitsu parts which would be identical to the US parts. Anyways...