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NP205 27 to 32 spline conversion

armyfiredawg

armyfiredawg

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So here is whats up. I have been looking for a 32 spline NP205 for my doubler for months now but have not succeeded very far. I was able to aquire a np205 27 spline for next to dirt cheap in great condintion. Does someone make a gear that will replace the 27 with the 32 input or am i wasting my time and just resell the 27 spline i have? I thought I saw somewhere that has that but can't remember where. THanks!!
 
Yeap you can get your case bored and then just buy a new 32 spline input. Or if you can find a ford 205 you can use its 31 spline input and then just order your doubler accordingly.
 
I dont' have the part # anymore but there is a bearing that allows you to put the 32 shaft in a 27 (or 10) spline case WITHOUT boring it. I have seen 2 cases successfully converted like this (they belong to Spicer & Ratzila).
 
if you're building a doubler, you are prolly gonna rebuild the case anyway. If you have it all apart, it shouldn't be hard to have the case machined for the bigger bearing. Its not a complicated job, the bore for the bearing has straight walls etc. Pretty straight forward. I forget the exact size the case needs to be bored too... but if you have the big bearing, the machinist guy can make 'er fit np. This is what I'm gonna do to my 27 spliner...

I'd like to see more info on the no-machining-necessary bearing... is it as beefy and long lasting as the stock type "big" bearing?

j
 
jekbrown said:
I'd like to see more info on the no-machining-necessary bearing... is it as beefy and long lasting as the stock type "big" bearing?
Click to expand...
x2 I have a 400/203 and a 10 spline 205 that I would love to marry.
 
Ok, I have bearings from both OE set ups here.

The part numbers on the bearings read as follows -

* 10/27 spline = "MRC 307 MG 5 USA" --- use outer diameter measurement
* 32 spline = "MRC 210MG2 USA" --- use inner diameter measurement

When Ratzila did his conversion (probably 10 years ago) he took these 2 exact bearings to a local bearing supply house (a company like Motion Industries should work). He told the counter guy he needed one bearing with characteristics from each and they found one.

David's (Ratzila) converted 400/205 combo ran fine for years between 2 different trucks as both a daily driver and then a dedicated wheeler (both trucks ran a 454 w/ 44's). In fact, it's still doing fine today it just belongs to someone else.
 
i went to their www site, but I don't know enough about bearing terminology to even find what I want. It does look like they have every bearing known to man...

j
 
nvrenuf said:
Ok, I have bearings from both OE set ups here.

The part numbers on the bearings read as follows -

* 10/27 spline = "MRC 307 MG 5 USA" --- use outer diameter measurement
* 32 spline = "MRC 210MG2 USA" --- use inner diameter measurement
Click to expand...

Where are those part numbers from? I would like to get a exact measurement from them
 
Those are the part numbers are off of each bearing. Sorry but I don't have anything better than a tape to measure the bearings. :doah:
 
small bearing - large input

:confused: uuugghhh.....

Going off memory here, but I think it was SKF P/N 6010N...

2 spacers need to be made to take up the slack in thickness of the bearing.

Marv
 
damn... there are spacers to? maybe I'll just machine the case... lol.

j
 
I'll check mine when I get homebut I believe they are the same. The 2 converted cases I'm familiar with have never had any type of spacer.
 
Ok, so here is what i ended up doing.

I ended up getting a rebuilt kit with the bearings. I took down the new 32 spline bearing and the 27 spline bearing to motion industries. Luckily, they happened to have a location 20 miles away. Score!! :D I went in and asked the guy to get me the outer on the 27 and inner on the 32. He went to his library of bearing books and picked out the closest one. It turned out to be 60 bucks. I had to order it since it wasn't there so I was a bit heasitant on weather it would fit. A few days later i picked it up and took it home to see if it would fit. And damned if it did! Perfect fit. But like marv_springer said, you need spacers to make up the difference. I will post pics of the bearing so others can see when i can. Thanks again for all the info!!
 
How about the part #.
Is it the same one Marv posted or did you come up with a different one?

Thanks
Bob
 
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