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-   V6 S197 General Discussion (http://mustangforums.com/forum/v6-s197-general-discussion-48/)
-   -   8.8 rear end or 3.73 gears? (http://mustangforums.com/forum/v6-s197-general-discussion/705716-8-8-rear-end-or-3-73-gears.html)

4.0beast 01-23-2014 04:44 AM

8.8 rear end or 3.73 gears?
 
Hey i have a 4.0l s-197 vortech supercharged h.o kit and i was thinking what would be better for my next move 8.8 rear end or 3.73 diff gears, what do you guys think?

XxDISMEMBEREDxX 01-23-2014 05:47 AM

Why not both? You can find a used 8.8 rear that has 3.73's already in it. You would still have the stock rear to swap back, or sell as a complete.

steel pony 01-23-2014 06:03 AM

^^^ +1
why waste time on something you're going to do anyways!
Upgrade them both at the same time.

tx_zstang 01-24-2014 01:43 AM

Yeah, upgrade to a 8.8...and then gears you want in that. Don't bother wasting money on messing with gears in the stock 7.5.

157dB 01-24-2014 09:45 AM

BOTH of course...

Do not waste your time stuffing 3.73s in a 7.5...
And if you do, do not buy Motive gears.
They are stamped with a flying "M" for reference...

2005Redfire6 01-31-2014 02:01 PM

8.8 for sure....

pascal 01-31-2014 06:37 PM

Another vote for the 8.8, makes all the sense in the world...

JimC 01-31-2014 07:01 PM

Worst modding decision I ever made was trying to build a 7.5. All it took was a CAI, tune, and set of drag radials to break supposedly indestructible Richmond gears.

In the end it was actually cheaper to swap to the 8.8 than it was to build the 7.5 with tlok, 3.73's, and LPW girdle.

2005Redfire6 02-03-2014 07:43 AM

Quote:

Originally Posted by JimC (Post 8343292)
Worst modding decision I ever made was trying to build a 7.5. All it took was a CAI, tune, and set of drag radials to break supposedly indestructible Richmond gears.

In the end it was actually cheaper to swap to the 8.8 than it was to build the 7.5 with tlok, 3.73's, and LPW girdle.

+1, I have a friend local to me I know personally that put a T-Lok and gears in his 7.5 and had issues with it making noises, etc. Had it rebuilt again, same issue. He has spent with parts and labor close to $750 or so and it still isn't right or as strong as the 8.8 stock.

kzonts 02-03-2014 10:02 AM

I agree with the group here, but I upgraded my 7.5 to 3.73's and t-lok. I chose Ford Racing gears and had them installed at Pro Dyno. That was over 40,000 miles ago and she's still holding up fine. And I don't exactly baby the car and have taken it to the track for a few runs. But you might as well go for the 8.8 if you have the opportunity.

2005Redfire6 02-03-2014 10:04 AM

Quote:

Originally Posted by kzonts (Post 8344328)
I agree with the group here, but I upgraded my 7.5 to 3.73's and t-lok. I chose Ford Racing gears and had them installed at Pro Dyno. That was over 40,000 miles ago and she's still holding up fine. And I don't exactly baby the car and have taken it to the track for a few runs. But you might as well go for the 8.8 if you have the opportunity.

Put some drag radials on there :)

kzonts 02-03-2014 10:06 AM

Quote:

Originally Posted by 2005Redfire6 (Post 8344329)
Put some drag radials on there :)

No way! :-) as long as the tires break loose I figure I'm safe. I hope.

2005Redfire6 02-03-2014 10:18 AM

Quote:

Originally Posted by kzonts (Post 8344330)
No way! :-) as long as the tires break loose I figure I'm safe. I hope.

For sure! Traction problems help a lot with longevity, well besides the tires lol.

amaNIN 02-03-2014 01:51 PM

Quote:

Originally Posted by 157dB (Post 8339971)
BOTH of course...

Do not waste your time stuffing 3.73s in a 7.5...
And if you do, do not buy Motive gears.
They are stamped with a flying "M" for reference...

Just wondering why... Because the cost does not justify the means?
because the 7.5's aren't made for it?
because I should have gotten a GT?
Just thinking about doing exactly that...put an lsd and 3.73's in a 7.5 rear end. I may save my money.http://mustangforums.com/forum/images/icons/icon11.gif

07rousche 4.0 02-03-2014 02:04 PM

I am currently ordering a new lsd for my rear end, and i alredy had 3.73's i had to find an excuse to install but it took me 40,000 miles of 300+ rwhp and an asswoopin on it every day for it to finally trim the teeth off the gears. If you arent 300+rwhp and dont plan to be anytime soon you will do great with just gears

2005Redfire6 02-03-2014 02:22 PM

Quote:

Originally Posted by amaNIN (Post 8344426)
Just wondering why... Because the cost does not justify the means?
because the 7.5's aren't made for it?
because I should have gotten a GT?
Just thinking about doing exactly that...put an lsd and 3.73's in a 7.5 rear end. I may save my money.http://mustangforums.com/forum/images/icons/icon11.gif

Because the 7.5 sucks and its going to break lol.

07rousche 4.0 02-03-2014 02:52 PM

7.5 does suck but it will last longer then your t5

JimC 02-03-2014 07:53 PM

Quote:

Originally Posted by amaNIN (Post 8344426)
Just wondering why... Because the cost does not justify the means?
because the 7.5's aren't made for it?
because I should have gotten a GT?
Just thinking about doing exactly that...put an lsd and 3.73's in a 7.5 rear end. I may save my money.http://mustangforums.com/forum/images/icons/icon11.gif

It has nothing to do with the "should have got a GT" junk.

Unless you are capable of doing all the work yourself, and repeating it when necessary, it will cost you as much or more to build a 7.5 as it will to just buy a 8.8 with everything you want already installed and swap it over. And you will still have a weak link in that rear end; plus if you need to rebuild that tlok you will find out that no one makes a rebuild kit for a 7.5.

I spent more to build a 7.5 with tlok, 3.73's and LPW girdle than it cost me to get the 8.8 and swap it in after I broke the 7.5. All it took was a CAI, tune, and set of drag radials to break the 7.5 - and that was on a set of Richmond gears that 2 shops said were "indestructible". Bent the pinion within a year.

So the cost doesn't justify it (and in fact it is tough to find a tlok now for the 7.5).

XxDISMEMBEREDxX 02-04-2014 12:24 AM

The 8.8 is a tougher rear. If you find a used 8.8 with 3.73 already in it, you'll save time and money. You will end up with a stronger, longer lasting setup. If you have to have new parts, you can buy a FRPP 8.8 pre-built rear with 3.73's. I'd look for a low mileage used one first. IMO... go with the 8.8 rear.

amaNIN 02-04-2014 09:36 AM

Quote:

Originally Posted by JimC (Post 8344614)
It has nothing to do with the "should have got a GT" junk.

Unless you are capable of doing all the work yourself, and repeating it when necessary, it will cost you as much or more to build a 7.5 as it will to just buy a 8.8 with everything you want already installed and swap it over. And you will still have a weak link in that rear end; plus if you need to rebuild that tlok you will find out that no one makes a rebuild kit for a 7.5.

I spent more to build a 7.5 with tlok, 3.73's and LPW girdle than it cost me to get the 8.8 and swap it in after I broke the 7.5. All it took was a CAI, tune, and set of drag radials to break the 7.5 - and that was on a set of Richmond gears that 2 shops said were "indestructible". Bent the pinion within a year.

So the cost doesn't justify it (and in fact it is tough to find a tlok now for the 7.5).

And they are more expensive. I don't think I'm going to upgrade my 7.5 rear end, I've heard enough bad things already.
If I were to find an 8.8 rear end with the lsd, and 3.73's or 4.10's or better than stock, wouldn't that be an easier install?
Because its already put together. You just have to fork up $1200 for it.


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