changing 25 spline diff to 28 spline

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elrob

Post subject: changing 25 spline diff to 28 spline

Posted: Fri Oct 09, 2009 8:36 am

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i have a 75 series lsd and would like to use it in a 78 series diff ,can i just use the side gears from the 78 series to make it a 28 spline diff?

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cjh

Post subject: Re: changing 25 spline diff to 28 spline

Posted: Fri Oct 09, 2009 8:21 pm

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28 spline axles won't fit into a 25 spline centre....the hole where the axles goes is smaller.

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elrob

Post subject: Re: changing 25 spline diff to 28 spline

Posted: Sat Oct 10, 2009 12:37 pm

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? dont they just go into the side gears.if they can be change than this wont be a problem,right?

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67RCE

Post subject: Re: changing 25 spline diff to 28 spline

Posted: Sat Oct 10, 2009 1:44 pm

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An LSD doesnt have side gears.

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cjh

Post subject: Re: changing 25 spline diff to 28 spline

Posted: Sat Oct 10, 2009 3:02 pm

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Ride: 93 ED sedan

Power: 161 rwkw

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elrob wrote:

? dont they just go into the side gears.if they can be change than this wont be a problem,right?

If I had some out right now, I would take photos and post them to show you.
The holes in the sides of the 25 slpine centre are TOO SMALL for a 28 spline axle to fit in.
The side bearings are different because of this too......but have the same outer diameter.
An LSD does have side gears....it wouldn't work without them.

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elrob

Post subject: Re: changing 25 spline diff to 28 spline

Posted: Sun Oct 11, 2009 8:48 am

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i might just have to stop being lazy and pull apart my 25 spline diff and 28 spline and compare :roll:

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cjh

Post subject: Re: changing 25 spline diff to 28 spline

Posted: Tue Oct 27, 2009 1:47 pm

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OK....I now have pictures to show what I mean. The 28 spline axle won't fit into a 25 spline centre.
In the pictures are a 25 spline 2 pinion LSD ( EA ), a 28 spline 4 pinion single legger ( EBII ), and a 28 spline 4 pinion LSD ( new ED/EF ).
I am building a 28 spline 4 pinion LSD diff, using 3.27 gears, and EBII housing to put into my ED sedan.

Attachments:

File comment: 28 spline axle in the 28 spline 4 pinion single leg centre

IMGP2966.JPG [ 325.04 KiB | Viewed 152 times ]

File comment: Showing how a 28 spline won't fit into a 25 spline centre.

IMGP2965.JPG [ 350.2 KiB | Viewed 182 times ]

File comment: Top view of 25 and 28 spline centres

IMGP2961.JPG [ 385.72 KiB | Viewed 160 times ]

File comment: Left= 25 spline 2 pinion LSD
Centre= 28 spline 4 pinion single legger
Right= 28 spline 4 pinion LSD

IMGP2959.JPG [ 385.24 KiB | Viewed 201 times ]

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elrob

Post subject: Re: changing 25 spline diff to 28 spline

Posted: Tue Nov 03, 2009 7:01 pm

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hmmmmm intereseting.how much do you think it is to small by.im thinking i can machine it out at work if the side gear fits that is.

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