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V6 Rear end Gears. 3.73 or 4.10

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Old 11-30-2008, 03:51 PM   #1
Shaunmac9128
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Default V6 Rear end Gears. 3.73 or 4.10

I'm looking to get teh 3.73 gears in my stock 01 V6. I was wondering if anyone knew the basic gains I could expect? Also if it would be worth it to get a Tlock as well? I am going to get the SCT SF3 programer and royal puple oil i think as well. does anyone have a guess as to how much it will cost to get installed? Or can it be done in my garage with simple hand tools?
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Old 11-30-2008, 04:02 PM   #2
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better off the line acceleration, about half a second in the quarter mile

tloks are junk, my car is on its 3rd FRPP diff, and all i have is intake/exhaust/tune, im going with a detroit true trac when the tlok thats in there goes out

i dont like synthetic in the rear end, i run straight GL-4 gear oil

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Old 11-30-2008, 04:11 PM   #3
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do you have an auto or a 5spd? The popular choice is 4.10 for the auto and 3.73 for the stick. Personally, I was going to get a 4.10 for my manual (driveability be damned lol), but they were hardcore backordered so I just went with the 3.73's (still waiting to be installed ).

I wouldn't really suggest a tlock; they can withstand up to 300rwhp, but they tend to break at stock power... a lot. It's hypocritical, but I have one (still waiting to be installed), but mine is just to get me through this winter; I'm going to be looking for an 8.8 rear end and a TrueTrac this summer.

And yeah, gears/lsd can be installed in a garage with (I believe) hand tools, but I wouldn't recommend it if you've never ripped apart a rear end before; from what I've heard, the spacing is hard to get right and requires a feel for it. If you don't space it right, you risk having gear whine and you could more or less destroy the rear end. I'd recommend just having a reputable shop doing it... it's what I'm doing (but I just don't trust myself lol)

*edit: also, remember that your cruising rpm's will be higher with 3.73's or 4.10's than they will be with the stock gear.
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Old 11-30-2008, 04:12 PM   #4
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I have an auto so you think the 4.10 would be better? I just dont want it to not have any highway acceleration thats the thing.
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Old 11-30-2008, 04:19 PM   #5
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Quote:
Originally Posted by reaper2022 View Post
do you have an auto or a 5spd? The popular choice is 4.10 for the auto and 3.73 for the stick. Personally, I was going to get a 4.10 for my manual (driveability be damned lol), but they were hardcore backordered so I just went with the 3.73's (still waiting to be installed ).

I wouldn't really suggest a tlock; they can withstand up to 300rwhp, but they tend to break at stock power... a lot. It's hypocritical, but I have one (still waiting to be installed), but mine is just to get me through this winter; I'm going to be looking for an 8.8 rear end and a TrueTrac this summer.

*edit: also, remember that your cruising rpm's will be higher with 3.73's or 4.10's than they will be with the stock gear.
where did you get 300 rwhp? they were designed for the 120 HP torquless 2.9 bronco 2/ranger/exploder
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Old 11-30-2008, 04:21 PM   #6
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I don't know if it'll be better, but I know it's a pretty popular choice for guys with auto's. But gears just don't increase off-the-line acceleration, they increase acceleration throughout the rpm range, so highway acceleration shouldn't be a problem. Just remember that 4.10's will reduce your top speed a good bit (I think the theoretical top speed of a manual with 4.10's is something like 125 compared to the theoretical 140 of stock gears), but there's really no reason you should be going that fast anyway

But either way, I'm sure you'll be happy. Even the 3.73 is a big step up from the stock auto rear end gear (I believe the stock rear end is a 3.27).

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where did you get 300 rwhp? they were designed for the 120 HP torquless 2.9 bronco 2/ranger/exploder
I'm just going by what the 3.8L Modifications sticky says
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Old 11-30-2008, 04:24 PM   #7
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Quote:
Originally Posted by reaper2022 View Post
I don't know if it'll be better, but I know it's a pretty popular choice for guys with auto's. But gears just don't increase off-the-line acceleration, they increase acceleration throughout the rpm range, so highway acceleration shouldn't be a problem. Just remember that 4.10's will reduce your top speed a good bit (I think the theoretical top speed of a manual with 4.10's is something like 125 compared to the theoretical 140 of stock gears), but there's really no reason you should be going that fast anyway

But either way, I'm sure you'll be happy. Even the 3.73 is a big step up from the stock auto rear end gear (I believe the stock rear end is a 3.27).
with a .70 4th gear in an auto with stock 3.27s and 26" tall tires at 5500 rpms its like 195 mph, 4.10s will be like 180... not really much to worry aboot there
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and a lots of parts awaiting install

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borla cat back, K&N, SCT tuned, Leveled, tinted, smoked cabs/markers, fisher mm2

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Old 11-30-2008, 04:26 PM   #8
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Okay thanks guys, and I think I'm going to go with the 3.73 gears from AM and get the SCT tuner, do either of you know how much it would run to get installed?
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Old 11-30-2008, 04:27 PM   #9
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i was quoted $300

you want one of these to

http://www.drivetrainspecialists.com...ruetrac-1.html
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Old 11-30-2008, 04:28 PM   #10
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Damn, I was hoping it would be less. I assume it cant be done at home with simple hand tools?
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Old 11-30-2008, 04:31 PM   #11
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Yeah, if you're quoted at more than $300 for a rear end install, go somewhere else. It generally shouldn't be more than $300, but it all depends on who's doing it and where you live, I guess.

But i was under the impression there was more of a difference in top speeds than that... I know when I ran my numbers though a gear/speed calculator, it was saying with the 3.73 I'd be at 2500rpm at 70 in 5th with the stock wheels/tires (compared to 2000 stock), but it may just be that I found a crappy calculator

And you'll be happy with the sct x3... I know I love mine

*edit: like I said, you can do it yourself with hand tools, but spacing everything requires experience/skill (or luck )... if you've never done a rear end before, I'd say it's probably a good idea to just have a shop do it for you. But I'd say search for a few how-to's on rear end gear installations... if you feel confident, go for it
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Old 12-01-2008, 08:46 AM   #12
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i would definately let a shop install it.... why not just sell that stuff and buy you an 8.8 if you plan on having power down the road lol
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Old 12-01-2008, 09:11 AM   #13
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If you are adding some power (turbo or supercharger), the stock differential carrier and aftermarket t-lok are weak; you can break teeth on the spider gears.
I built up a 7.5 rear for 2005+ with 3.73s, but am not using it now.

Depending on your power level, a 8.8 swap may be the best overall for the money, long term.

As far as swapping the gears yourself, it's not a trivial thing that anyone can do right. It does take a couple of special tools for proper clearances and pre-load torque, and maybe pressing on/off some bearings. Otherwise its not technically hard to do. Find a local reputable shop though.

4.10s will get you up to speed faster, but will rev your engine higher on the highway. If you do lots of highway driving, I'd recommend 373s. If you do lots of city driving and just have that heavy foot and love the acceleration, go with 410s.
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Old 12-01-2008, 10:34 AM   #14
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I blew my 7.5" up with just bolt-ons on a set of Michelin pilots just taking off from a stop light, I wouldn't trust them to anywhere near 300rwhp.
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Old 12-01-2008, 10:59 AM   #15
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8.8s arent even that stronge, i blew one up in a stock mach 1, roughly ~280 rwhp

built 7.5 > stock 8.8
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Old 12-01-2008, 05:08 PM   #16
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What is all including in "building up" a rear end? I have heard some terms tossed around about spindels and such but I have no idea what that means.

And is a beefed up 8.8>7.5 or 8.8=7.5.
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Old 12-01-2008, 05:19 PM   #17
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stock 7.5 <stock 8.8 <built 7.5 <built 8.8 <9"

built would be a detroit/eaton diff, at a minimum, girdle and hardened axles wouldnt hurt either
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Old 12-01-2008, 05:58 PM   #18
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+1 a 7.5 can be built stronger than an 8.8, but the 8.8 is a stronger starting point.
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Old 12-02-2008, 09:42 AM   #19
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Say I was to drop a 8.8 stock rear end from a gt into my v6 (from the same generation stang of course). That would give me a stronger rear end for most upgrades and then I can beef it up some more to handle just about anything.

Correct?

Also is a tuner needed if I swap it out with a stock gt rear end? Or is there some cailbration tool needed or what?
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Old 12-02-2008, 11:23 AM   #20
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if you build the 8.8 it will handel more then a built 7.5, but a built 7.5 should be fine for pretty much anyone on this site.

a 97 will need the speedo gear in the tranny depending on the gear ratio
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borla cat back, K&N, SCT tuned, Leveled, tinted, smoked cabs/markers, fisher mm2

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Old 12-02-2008, 11:23 AM
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