strengh of tii rear end vs stock mustang 28 spline 8.8 solid rear sra

[ImportEvolution]

Anyone know the strengh of tii rear end vs stock mustang 28 spline 8.8 solid rear  ?  I spoke to grannies and they said the stock 8.8 would be stronger but I've read lots of stories on the mustang boards of  stock rears breaking at like 300whp .  I've been running my tii rear 6sp with 500+ whp with no problems

just curious

[MPbdy]

What do they say is breaking?  Your car is like 800 pounds lighter than a mustang.

The T2 rear has been in the 8's or something like that, so it can take the power.  For how long hasn't really been answered, but you can pick up a new rear end for like $200 worst case.  People who try to launch hard with slicks break axles the first few runs usually, but the diff itself stays together.

The larger ring gear is going to be stronger.  The biggest reason people swap to the 8.8 with the FC is for gear ratio selection and axle strength.  If you're happy with the gear ratio I know there are stronger axles out there for the turbo 2 rear end.

[ImportEvolution]

I think the axle is breaking and then they upgrade to the 31 spline axle and diff.  But it seems like a lot of the mustang guys upgrade to 31 spline pretty early in the mod process.

If I knew 28 spline would work good, I'd probably go ahead and do the sra swap sooner rather than later. 

those fox bodies are pretty light too, especially when the drag guys put them on a diet

shipping weights for the V8 models
LX notchback: 3035
LX hatchback: 3100
LX convertible: 3240
GT hatchback: 3190
GT convertible: 3330

[AWD V8]

The S10 guys are using the Explorer rear ends as they are much stronger. So far they have 3800 lb trucks running slicks on a stock rear end, going under 10 secs. I've been on that forum for years and not heard of one breaking.

I've got one in my AWD Jimmy in preparation for my LSX V8.

[ImportEvolution]

The S10 guys are using the Explorer rear ends as they are much stronger. So far they have 3800 lb trucks running slicks on a stock rear end, going under 10 secs. I've been on that forum for years and not heard of one breaking.

I've got one in my AWD Jimmy in preparation for my LSX V8.

quote from granny site :  NOTE-...although the stock Explorer rear is 59-1/2" wide, it is not suitable to use in a RX-7 if a 59-1/2" width is desired. The Explorer used un-equal length axles resulting in a whopping 2-3/4" pinion offset, not practical for our purposes. Only start w/ an Explorer rear if you want a rear 56-1/2" WF/WF or narrower. If you want to use heavier Explorer style center with the larger axle tubes and maintain a stock 59-1/2" WF/WF width, the best option is to narrow a wider 8.8 from a full size truck.

[ImportEvolution]

I found that the 28 spline has a diameter of 32.75mm and the tii halfshaft diameter is 26mm.    Does anyone know the diameter of the tii stub shaft that always breaks?

[AWD V8]

I'm not aware of the desired axle width, only offering an option. Guys are also narrowing the off-set rear axle by 3" for the 2wd trucks. So that might be better, or not?

When they narrow them they buy another short axle (which is 3" shorter) and shorten the longer tube giving a centered diff. Many guys shorten the tubes themselves by doing a simple butt weld and relocate the spring perches, if using leafs.

So I don't know if this is still an option or not. Only been wrenching on my S10, and never considered an 8.8 for a Mazda.

[MPbdy]

Hmmmm I see now you're talking about solid rear.  Not sure if the 28 spline solid axles are weaker than the 28 spline IRS units.

I also thought you were talking about the lard ass mustangs that came after the fox bodies, the ones with irs

[AWD V8]

I thought we were talking solid rear axle, I guess I'm so focused on old school Chevy trucks I didn't even think about IRS.

So go ahead and ignore me, I won't be offended.

[MPbdy]

No you're right, the OP is wanting to know about solid rear.

I glanced over that and was thinking about IRS stuff...

[AWD V8]

Well I'm no expert, on anything really, just that I installed an Explorer 8.8 in my truck, and I've been on the S10 forums for quite awhile so I know a bit about the one I installed. Just saying the Explorer 8.8 is much stronger than the Mustang 8.8. I've read that the Mustang guys are swapping in the Explorer rear axles. And if a guy is handy at fabricating it can be shorten with a minimum of effort and expense.

[zbrown]

I found that the 28 spline has a diameter of 32.75mm and the tii halfshaft diameter is 26mm.    Does anyone know the diameter of the tii stub shaft that always breaks?

IIRC the TII doesn't break at the full axle diameter, they break at the base of the splines where there is a groove/ring that has a smaller diameter


IMO the 28 spline 8.8 would be a considerable amount stronger than the TII