Power limit/capacity of the 7.5 Posi-Trac

Barricade81 · November 14th, 2010, 01:28 AM

Originally Posted by stangcharger

As long as you don't beat it often at the track even a factory 7.5 rear will be fine. With prolly 10 total times to the track from 301rwhp-436rwhp never had an issue. Still on 7.5 rear with just 3.73 and posi added, no upgraded parts yet.

Ah, Mr. Stangcharger, I remember looking at your website a few months ago. I never realized you stayed with the 7.5 rear though. That being the case it kind of swings me back towards doing the 7.5.

I'll just have to see what type of prices I can get between 8.8 and 7.5 to see which way I'll go with it. Thanks guys.

Codeman · November 14th, 2010, 05:34 PM

If you can get an 8.8 cheap with the gears you want for 500 bucks go for it because parts will almost cost you that for the 7.5. But if you can't find one for cheap go with the gears you want and a tru trac.

Barricade81 · November 14th, 2010, 11:48 PM

Originally Posted by Codeman

If you can get an 8.8 cheap with the gears you want for 500 bucks go for it because parts will almost cost you that for the 7.5. But if you can't find one for cheap go with the gears you want and a tru trac.

So far I'm only finding about a $70 difference between the 7.5 and the 8.8 differentials, and the gears for each are running the same price too. And installation wouldn't be any different for each.

But wouldn't I also need to get 31 spline axles along with the 8.8 differential? The Ford Racing 8.8 I've been looking at says it is for 31 spline axles, and the V6 rear end is a 28 spline, correct?

BlueScreaM · November 15th, 2010, 12:01 AM

Originally Posted by Barricade81

So far I'm only finding about a $70 difference between the 7.5 and the 8.8 differentials, and the gears for each are running the same price too. And installation wouldn't be any different for each.

But wouldn't I also need to get 31 spline axles along with the 8.8 differential? The Ford Racing 8.8 I've been looking at says it is for 31 spline axles, and the V6 rear end is a 28 spline, correct?

Wouldnt the 8.8 instillation cost more because they would still have to put the gears in and swap the 7.5 out.

ESG-642T · November 15th, 2010, 12:08 AM

Originally Posted by Ahoboscheese

Wouldnt the 8.8 instillation cost more because they would still have to put the gears in and swap the 7.5 out.

take them the gears and 8.8
and then
swap the rear ends your self

November 14th, 2010, 05:34 PM	#22
Codeman Hardcore Enthusiast Join Date: Nov 2007 Location: North Dakota Posts: 2,933 iTrader: 1 reviews	If you can get an 8.8 cheap with the gears you want for 500 bucks go for it because parts will almost cost you that for the 7.5. But if you can't find one for cheap go with the gears you want and a tru trac. __________________ UDP, CAI, True Duals, LTs, 91 Tune from TT, 3.73 gears, Tlok,Windstar upper, GT TB, Ported lower, Comp 218/226 cam, FRPP C Springs, J&M LCA, Tokico Blue shocks and struts, and J&M Full Length Subframe Connectors

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