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Pages: 1

In this thread we will discuss 28 to 31 spline conversions

(Click here to view the original thread with full colors/images)

Posted by: 94m5

ok, long story short is,

I bought an Explorer diff, and just now learned that it is a 31 spline. Jeremi said that there isn't much difference length wise between the cobra cv shafts and the viii units.

My question is, has anyone put cobra halfshafts in a viii? I can buy new shafts fairly cheap and would like to go this way. I have heard there is only ~3/8" difference between the two.

If not, I'll just put the new inner knuckles on my old shafts. I would like to have 100% new shafts, but can deal with rebuilds.

Sorry for all the questions lately, I'm just trying to get things lined up in advance.

Mike

Posted by: kustomizingkid

Can't you just swap the side gears in your new diff instead?

Posted by: unity

I have no clue what we are talking about

But Mark VIII new OEM shafts can be had for $100 on eBay right now.

Posted by: Markviiiedrea

the side gears and hubs will have to be change or use a 99 and up IRS diff. when it comes down to it

31= stronger
28-inexspensive

Posted by: 94m5

It is a 02 explorer center section. Is there any way that I can use the stock side gears in the new diff, or should I sack up and pay the 215$ for a new diff from Max?

Thanks guys

Mike

Posted by: Markviiiedrea

Its alot of work for used side gears. you can get a center section for less then that. I would say just buy one and put it in.

Posted by: chickenviii

you mention, putting the inner joint on the existing axle (in one way or another) could be a possibility

Posted by: slowmkviii

I am working on changing to 31 spline at the moment finding axles for a good price is my problem

Posted by: slowmkviii

Quote:

Originally Posted by Markviiiedrea

the side gears and hubs will have to be change or use a 99 and up IRS diff. when it comes down to it

99-2002 diffs will be 28 spline and 03-04 are 31 spline and no need to change hubs

Posted by: kustomizingkid

Just slap your 28 spline side gears in.

Posted by: Markviiiedrea

Quote:

Originally Posted by slowmkviii

99-2002 diffs will be 28 spline and 03-04 are 31 spline and no need to change hubs

I was thinking cobra

Posted by: Roadboss

go here for your axles:

http://stores.ebay.com/PANOZ-AUTO-MI...QQftidZ2QQtZkm

Posted by: 94m5

Allright guys,

I think I'm just gonna break down and buy the new Diff from Max. For 215 Bucks, it's not worth my time and aggrivation to tear apart a brand new set of CV's and Frankenstien ones that will work.

If anything, I'll throw a quick rebuild on my 31 Spline diff and E-bay the sonofabitch.

Thanks for your insight guys.

Mike

Posted by: slowmkviii

Quote:

Originally Posted by Markviiiedrea

I was thinking cobra

that is cobra

Posted by: 94m5

Quote:

Originally Posted by kustomizingkid

Just slap your 28 spline side gears in.

I must have missed this before, Will this work? I figured there would be a difference between the open spiders and the trak-lok units.

I'll gladly go this way if it will work.

Posted by: slowmkviii

Quote:

Originally Posted by 94m5

I must have missed this before, Will this work? I figured there would be a difference between the open spiders and the trak-lok units.

I'll gladly go this way if it will work.

there is a difference between open diff and track-lok diff. Spider gears don't have much to do with the open or track-lok If you got an open diff you can change side gears to make it 28 or 31 spline if you need. I also thought that an explorer diff had only one mounting spot on the front of the diff or did you by just a track-lok If it is just a track-Loc and It is the same as a f-150 or cobra 03-04 you can not change the side gears to 28 spline you would need 31 spline half shafts new at for the retail for $276 each pending on your discount

Posted by: Psychostang

Just as an fyi, 99 Cobras are 28 spline. 2001 and up Cobras are 31 spline. Also, 28 spline gears are physically smaller than 31 spline gears, so they won't work.

Posted by: slowmkviii

Quote:

Originally Posted by Psychostang

Just as an fyi, 99 Cobras are 28 spline. 2001 and up Cobras are 31 spline. Also, 28 spline gears are physically smaller than 31 spline gears, so they won't work.

Only 03-04 terminator's have 31 spline diffs period.

Posted by: 94m5

ok, I'm a bit confused,

I have a complete 02 explored center section. I want to pull the trak- Lok out of it, and pull my original 28 spline spider gears out of my open differential and put them in the explorer differential to make it a 28 spline in stead of a 31.

Will my original 28 spline open differential spidergears work in a limited slip setup?

Thanks guys

Mike

Posted by: slowmkviii

no sorry wont work

Posted by: slowmkviii

hope this helps on the right is a 03-04 cobra track-lok 31 spline side gear and pinion shaft on the left is a open diff 28 spline side gear and pinion shaft

Posted by: 95sc

Quote:

Originally Posted by slowmkviii

Only 03-04 terminator's have 31 spline diffs period.

That's incorrect, 00 cobra R and 01 cobra had 31 spline differential also.

Posted by: slowmkviii

Quote:

Originally Posted by 95sc

That's incorrect, 00 cobra R and 01 cobra had 31 spline differential also.

sorry you are correct forgot about that one not a very commen rear end to show up for sale and I was talking about cars not trucks so dont go there

Posted by: 95sc

BTW swapping to stock 31 spline axles won't make your IRS stronger because they still use 28 spline outer shafts and that's the spot when axles brake most of the time , anyway .There is a guy over on Tccoa running DSS cobra level 5's

Posted by: Psychostang

99 Cobras have 28 spline, and 01 up cobras have 31 spline...PERIOD!!!

Posted by: slowmkviii

Quote:

Originally Posted by Psychostang

99 Cobras have 28 spline, and 01 up cobras have 31 spline...PERIOD!!!

I did some looking you are probably correct I think I just had bad luck
both people I talked to when I bought my diff said thay had an 01 diff with the 28 spline Now I think they were wrong and you are right
sorry I just had bad info

Posted by: Psychostang

Not a problem at all. Most people don't know that ford switch between 99 and 01. Prolly because those two vehicles didn't receive any where near as much attention, as the 03/04 cobras did.

Posted by: vr4

Quote:

Originally Posted by Psychostang

99 Cobras have 28 spline, and 01 up cobras have 31 spline...PERIOD!!!

bingo

Quote:

Originally Posted by slowmkviii

hes right.

ALL explorers have 31 spline. IRS or not. ranger 8.8s are 28 spline EXCEPT for rangers equipped with the torsen diff (FX4 level 2)

when it comes to IRS 8.8s in cars...all are 28 spline up until 2001 cobras. 99 is the only cobra IRS with 28 splines

Posted by: 94m5

Got it, Thanks guys,

I'm calling Max as we speak for the diff.

Posted by: MarkVIII93

Okay... who does hub redrills? I need mine drilled asap.

Posted by: 94m5

CRAP........

I pointed you to the wrong thread man Im sorry.

You need the one regarding my hub swap. The link is in there.

Mike

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