FRPP 3.73 Gears + T-LOK?
07-08-2009, 04:15 PM
#11
Join Date: May 2008
Location:
Posts: 23
If I understand your question, yes there are 4.10 and 3.73 gear sets that fit the 7.5" rear end. So no you would not necessarily have to get the 8.8 to have those gear ratios.
07-08-2009, 04:29 PM
#12
Join Date: May 2008
Location:
Posts: 23
Keep in mind that an 8.8 rear is at least 50 pounds heavier than the stock rear. If you are not going FI.. or running the car at the track with slicks.. it is not really necessary. That said.. there is nothing at all wrong with "overbuilding" the rear end (if you don't mind the added weight).
The t-lok itself is not really that expensive.. and you really do need it with the 3.73 or 4.10 gears.. traction will be an issue if you don't.
The t-lok itself is not really that expensive.. and you really do need it with the 3.73 or 4.10 gears.. traction will be an issue if you don't.
07-08-2009, 05:08 PM
#13
5th Gear Member
Join Date: Oct 2005
Location: Southern California
Posts: 3,678
QUESTION: has anyone actually blown their 7.5 t-lok under regular driving conditions while F/I? seems that its only an issue if you take it to the track. i believe Beaustang is still running a 7.5 (4.10) with the X.
07-08-2009, 07:57 PM
#14
5th Gear Member
Join Date: Oct 2006
Location: MO
Posts: 3,234
A member from another forum (that used to be called "4.0...) weighed his.. and this is what he said:
"V6 stock-no tloc 120 pounds
8.8 with 3.73s and tloc 175 pounds
I am not 100% sure it is completely accurate but after picking them both up together I am gonna say I am at least pretty close with a 55 pound difference. DAMN!"
Also.. while this is solely based on information gathered from the internet.... If you are going to run track drag radials you should get the 8.8. If your are your average driver that will have street tires.... even with a few burn outs and spirited driving.. you will be fine with simply adding new gears and a t-lok to your stock differential.
"V6 stock-no tloc 120 pounds
8.8 with 3.73s and tloc 175 pounds
I am not 100% sure it is completely accurate but after picking them both up together I am gonna say I am at least pretty close with a 55 pound difference. DAMN!"
Also.. while this is solely based on information gathered from the internet.... If you are going to run track drag radials you should get the 8.8. If your are your average driver that will have street tires.... even with a few burn outs and spirited driving.. you will be fine with simply adding new gears and a t-lok to your stock differential.
07-08-2009, 09:05 PM
#15
2nd Gear Member
Join Date: Jun 2009
Location: Iowa
Posts: 324
so, let me get this straight, I am thinking of upgrading from the 3.31 gears on my 08 GT to the 3.73's. I should be ordering the t-lock and bearings, along with the gears themselves, correct? Should I also order the install kit that is on the drop down at American Muscle? If I order all of these, is there ANYTHING else that needs to be purchased? And, do I then take the car to the Ford dealership to be re-flashed for the speedo to be correct? Any help would be appreciated, as I am seriously considering ordering these soon. I am waiting to get the price tomorrow of what the install will cost. Thanks!
07-08-2009, 09:28 PM
#16
Moderator
Join Date: May 2006
Location: Michigan again!
Posts: 8,579
If you have the GT 08droptop, you already have the Tlok. It comes on all the 8.8 rear ends (which is the stock rear end for the GT).
As far as reflashing, you will probably find it cheaper in the long run to buy a SCT tuner and reflash the car yourself. The dealer will probably charge as much as what the handheld will cost you, and you can upgrade to a better intake and tune as well. The gear set up is one of the adjustable options on the SCT.
As far as reflashing, you will probably find it cheaper in the long run to buy a SCT tuner and reflash the car yourself. The dealer will probably charge as much as what the handheld will cost you, and you can upgrade to a better intake and tune as well. The gear set up is one of the adjustable options on the SCT.
07-08-2009, 11:18 PM
#17
3rd Gear Member
Thread Starter
Join Date: Apr 2009
Location: WA
Posts: 537
Higher gear ration will allow faster acceleration with the sacrifice of having a lower top speed. A Traction Lock (T-lok) will allow power to go to both rear wheels rather than just the rear right wheel.
If you get just the gears without a t-lok, you will probably get no traction at all and will be a useless mod. Getting a t-lok is beneficial for better traction, so it is worth it to get it.
Some people just end up getting a GT take-off 8.8 Rear end because they are stronger, and have gears pre installed in them. Both are an expensive route, but worth it in the end,
If you get just the gears without a t-lok, you will probably get no traction at all and will be a useless mod. Getting a t-lok is beneficial for better traction, so it is worth it to get it.
Some people just end up getting a GT take-off 8.8 Rear end because they are stronger, and have gears pre installed in them. Both are an expensive route, but worth it in the end,
That makes perfect sense to me. Getting gears without a T-lok then would be like getting a cold air intake without a tune....a mod whose true potential isn't being fully achieved.When you say "Higher gear ration will allow faster acceleration with the sacrifice of having a lower top speed."....what do you mean by "with the sacrifice of having a lower top speed? Does that mean that I won't be able to hit 80, 90, 100 mph anymore?
Also, I have the FRPP cold air intake + ProCal tune on my car. I imagine that I will need to reflash the PCM with the new gear ratio when I have the gears changed correct?
07-09-2009, 02:03 AM
#19
5th Gear Member
Join Date: Oct 2005
Location: Southern California
Posts: 3,678
top speed is irrelevent and shouldnt even be a considered factor.... unless of course you like to run high speed chases with cops on open highways 
.... sure you lose some top speed with higher gears but how often are you driving 120mph+?.... realistic performance is what your car can do under 100mph.
.... sure you lose some top speed with higher gears but how often are you driving 120mph+?.... realistic performance is what your car can do under 100mph.
