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Old February 21st, 2012, 02:28 PM   #1
Mr. Beefy
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Default 46RE to D300

Ok I finally got a new trans for my rig.

I also acquired a D300.

Can anyone tell me what is needed to adapt the two together?

Trans is a 1996 46RE (1/2 ton dodge)

The bolt wholes line up but the tcase won't actually fully engage the input is too large. I'm explaining this wrong I'm sure, I'll get a picture.

Keep in mind I have a drivers drop 60 so I also have to flip the case.
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Old February 21st, 2012, 06:41 PM   #2
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What is the spline count of the output shaft on the trans?
The input of the 300 should be 23 spline. You will need to buy the input for the t case from jb conversions to match the spline count of the trans. You may also need a flip ring to mount the t.case to run a d side drop.
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Old February 22nd, 2012, 09:49 AM   #3
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I didn't have much time to look at it I'll try and get over to the shop tonight and check Tom.

JB Conversions you say.

Some people have been telling me not to do the 300 but to do a 205 instead as it's already a drivers drop. But I want to keep some of the gearing. Any inputs on this?
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Old February 22nd, 2012, 12:09 PM   #4
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From what I've found the 46re is already 23 spline output and has the 6 bolt mounting flange. The biggest thing is the width of the pan compared to the front output on the d300. It would require either a 2 piece shaft or a fairly small diameter one. The other thing is getting the shifter rails to seal since they'll be on the bottom of the tcase. Double seals is a common thing or run the Down East Offroad shifters. Those will relocate the shifter to the top on a flipped D300.
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Old February 24th, 2012, 07:06 AM   #5
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I counted the splines and yes, 46 Re and the 300 are 23 spline.

The 205 I know of is 31 splines so that's kinda out of the picture without some major changes.

I'm going to modify the 300 like in the thread you posted and put it together to get an idea of weather or not my driveshaft is going to work.
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