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Old 01-30-2017, 03:01 PM   #1 (permalink)
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full size tcase to trans adapter bolt pattern

Does anyone know the degree spacing between the bolt holes? I know they aren't all evenly spaced and I know 6.812" is the diameter of the circle running through the center of the 6 bolt holes but not the spacing between them.

I will post up the files for this once I have the proper pattern on it
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Old 01-30-2017, 10:02 PM   #2 (permalink)
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If no one else can get it in the next couple days I will try and remember to take some measurements...
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Old 01-30-2017, 11:04 PM   #3 (permalink)
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I assume you are talking about an NP205 or similar transfer case with the same pattern?

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Originally Posted by billybob_81067 View Post
If no one else can get it in the next couple days I will try and remember to take some measurements...
I was thinking the same. I can measure distance from the bolt-to-bolt outer diameter with calipers. Knowing those distances and a bolt pattern diameter should give the degrees. I'd like to compare to what you get to see how accurate we both are.

-Joseph

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Old 01-30-2017, 11:31 PM   #4 (permalink)
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https://www.pirate4x4.com/forum/chevy...ong-np205.html
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Old 01-31-2017, 11:34 AM   #5 (permalink)
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unfortunately the ford and chevy patterns are not the same but they do look very similar
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Old 01-31-2017, 05:19 PM   #6 (permalink)
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They are the same but clocked differently.

You need to position the ecentric over 90*
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Old 02-01-2017, 01:12 AM   #7 (permalink)
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Shit I was just thinking a ZF5 speed or E4OD to a BW 1356 pattern... Would that be the same as the 6 bolt married NP205 pattern?
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Old 02-01-2017, 02:03 AM   #8 (permalink)
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Shit I was just thinking a ZF5 speed or E4OD to a BW 1356 pattern... Would that be the same as the 6 bolt married NP205 pattern?
Yes.
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Old 02-01-2017, 07:48 AM   #9 (permalink)
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They are the same but clocked differently.

You need to position the ecentric over 90*
that is great news! thank you very much!
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Old 02-01-2017, 07:49 AM   #10 (permalink)
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Once I find time I will update the models and post up the files probably in their own thread for anyone to use/modify as they want
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Old 02-02-2017, 12:21 AM   #11 (permalink)
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Here are the measurements that I got. This was off the back of the transmission. I used dial calipers, but I guarantee there may be some wiggle room in my measurements, because the holes are oversized for the bolts for the transfercase. It was clocked like the pic shows too... With the upper right bolt hole being closer to 12-o-clock than the left hand side. All the distances between the bolt holes measured basically the same except for the one I have marked in red.

Name:  bolt hole pattern.png
Views: 368
Size:  12.8 KB

Hope it helps.
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Old 02-03-2017, 01:02 PM   #12 (permalink)
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awesome thanks!
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Old 02-03-2017, 03:09 PM   #13 (permalink)
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I'm a little late with this. I kept forgetting to pull it off my work computer.

I took a 4R70W adapter in to work a while back and probed it with a coordinate measuring machine so I could import it to Solidworks for my own amusement.

64 and 59.2 are probably the nominal spacing angles, but the one I measured isn't exactly that. The clocking pin is centered between at 29.6.

Since this is the transmission adapter, looking toward the trans, your reduction box would be a mirror image.

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