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post #1 of 39 (permalink) Old 03-24-2009, 05:31 PM Thread Starter
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3.55's?

hey guys i got a 95 cougar xr7. i have the 3.08 gears now and looking to get some 3.55's what would you recommend?
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post #2 of 39 (permalink) Old 03-24-2009, 05:40 PM
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3.73 or 4.10 or 4.30 all depends on what you want to do with it.

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post #3 of 39 (permalink) Old 03-31-2009, 01:27 PM
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Ill give a free BUMP becuz i wanna look into puting 3.55 gears in my t-bird. Are they worth it? will they make my car any quicker? lose of MPG?. (Sorry, I dont mean to hijack this thread!)
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post #4 of 39 (permalink) Old 03-31-2009, 01:29 PM
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at a minimum, put 3.73 gears in these cars.

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post #5 of 39 (permalink) Old 03-31-2009, 01:31 PM
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Quote:
Originally Posted by TRickert View Post
Ill give a free BUMP becuz i wanna look into puting 3.55 gears in my t-bird.
Are they worth it? will they make my car any quicker? lose of MPG?. (Sorry, I dont mean to hijack this thread!)
will they make my car any quicker? YES
lose of MPG? YES
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post #6 of 39 (permalink) Old 03-31-2009, 02:19 PM
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I have 3.55's in mine right now. I'd take 3.73 or 4.10's over them hands down.

-Matt
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post #7 of 39 (permalink) Old 03-31-2009, 03:06 PM
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What kind of mpg are you getting?

Jon, 96 Thunderbird LX Sport
2004 Explorer PI, 02 GT MAF + Airbox, BBK 78mm TB, Marauder TC, Ceramic coated ported manifolds by Braincoating, 3.73 Trac lok, Cut Sport springs, SC side skirts
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post #8 of 39 (permalink) Old 03-31-2009, 04:02 PM
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3.73's here. I get around 19-20 MPG on a worn out early '95 engine with bad valve seals and over 200K miles.

With a low miles Explorer I'd expect to get MPG in the mid 20's.

I also highly recommend the 3.73's over the 3.55's.

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post #9 of 39 (permalink) Old 03-31-2009, 04:34 PM
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I have 3.73s in my MarkVIII and I still get 22-24mpg running 75-80 on the highway. Cruising at 80 is right around 2600rpms, so it isn't like the revs are too high on the highway. Definitely don't waste your time with 3.55s, go with 3.73s if you spend a decent amount of time on the highway, and 4.10s if you hardly ever see the highway.

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post #10 of 39 (permalink) Old 03-31-2009, 05:38 PM
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That really does amaze me. I believe yall but still. I have 3.08's with an UNTUNED explorer motor and running the highway:city 80:20 I get about 23-24 mpg's. I run ~75 on the highway.

I assume what I need to do is stop doubting and believe yall!!

Jon, 96 Thunderbird LX Sport
2004 Explorer PI, 02 GT MAF + Airbox, BBK 78mm TB, Marauder TC, Ceramic coated ported manifolds by Braincoating, 3.73 Trac lok, Cut Sport springs, SC side skirts
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post #11 of 39 (permalink) Old 03-31-2009, 06:31 PM
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I had 3.73's and now up to 4.10's (or down LOL)

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Updated 10/14/11
3800 Dirty Dog installed and drag radials
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post #12 of 39 (permalink) Old 03-31-2009, 09:26 PM
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I've been getting 18-19 city if i'm not driving how I like too, highway I usually get around 25. My city mileage actually improved going to the 3.55's, highway is nearly the same.

-Matt
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post #13 of 39 (permalink) Old 04-02-2009, 05:21 PM
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Quote:
Originally Posted by Trunk Monkey View Post
3.73's here. I get around 19-20 MPG on a worn out early '95 engine with bad valve seals and over 200K miles.

With a low miles Explorer I'd expect to get MPG in the mid 20's.

I also highly recommend the 3.73's over the 3.55's.

Which brand of gears did you go with? I would like to get this upgrade as well.
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post #14 of 39 (permalink) Old 04-02-2009, 05:32 PM
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Originally Posted by Sleeper_95 View Post
Which brand of gears did you go with? I would like to get this upgrade as well.
IMO, I wouldn't buy any other gear than Ford Racing brand.

But I have heard of many sets of Motive gears being installed and used w/o any issues also. They are a cheaper gear made in China.

pics of my car
http://forums.tccoa.com/showthread.p...ght=train+yard

Updated 10/14/11
3800 Dirty Dog installed and drag radials
13.0 @ 106.5 1.79 60ft

Last edited by R8D-XXX; 04-02-2009 at 05:38 PM.
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post #15 of 39 (permalink) Old 04-02-2009, 05:35 PM
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Originally Posted by Trunk Monkey View Post
3.73's here. I get around 19-20 MPG on a worn out early '95 engine with bad valve seals and over 200K miles.

With a low miles Explorer I'd expect to get MPG in the mid 20's.

I also highly recommend the 3.73's over the 3.55's.
Quote:
Originally Posted by Sleeper_95 View Post
Which brand of gears did you go with? I would like to get this upgrade as well.
They're FRPP (Ford Racing Performance Parts) gears.

Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. FusionŽ Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto

Last edited by Trunk Monkey; 04-02-2009 at 06:22 PM.
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post #16 of 39 (permalink) Old 04-02-2009, 05:59 PM
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I'm with these guys, lol. I went from 3.27s to 3.73s and never regret it. It seems like I am always in the power band on the highway. I can about gaurantee you will regret not getting 3.73s as you may have noticed from some of the guys who went with 3.55s on here.
3.73s FTW

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post #17 of 39 (permalink) Old 04-02-2009, 09:14 PM
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They're FRPP (Ford Racing Performance Parts) gears.
Got a link or part number? Seems everything is all Mustang parts. Also, I'm thinking of getting the Hypertech module. I wonder if the programming of the hypertech will take into account the change in gear ratio? As you can tell, modifying my stock '95 T-bird is all new to me.
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post #18 of 39 (permalink) Old 04-02-2009, 10:51 PM
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Got a link or part number? Seems everything is all Mustang parts. Also, I'm thinking of getting the Hypertech module. I wonder if the programming of the hypertech will take into account the change in gear ratio? As you can tell, modifying my stock '95 T-bird is all new to me.
Gears for a mustang and t-bird are the same. Even though a t-bird has IRS, the pumpkin is still an 8.8 rear end. You can usually find a used set of gears from somebody for almost half price, or you can buy new from Summit for about $160 I think.

pics of my car
http://forums.tccoa.com/showthread.p...ght=train+yard

Updated 10/14/11
3800 Dirty Dog installed and drag radials
13.0 @ 106.5 1.79 60ft
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post #19 of 39 (permalink) Old 04-03-2009, 09:19 AM
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Thanks. Would something like this work?

http://store.summitracing.com/partde...5&autoview=sku
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post #20 of 39 (permalink) Old 04-03-2009, 09:43 AM
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Thanks. Would something like this work?

http://store.summitracing.com/partde...5&autoview=sku
yes.

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post #21 of 39 (permalink) Old 04-11-2009, 01:05 AM
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At the risk of hijacking.... if anyone is interested in a set of 3.55's I've got a set for sale.


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post #22 of 39 (permalink) Old 04-11-2009, 10:52 AM
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Read in another thread that the computer will adapt up to 2 gear changes. If that's the case, wouldn't anything over the 3:55's require a tune??

95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #23 of 39 (permalink) Old 04-11-2009, 11:12 AM
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Guess my question is, when you guys went from stock to 3:73's, did ya have to get a tune or if not, notice any strange side effects?

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K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #24 of 39 (permalink) Old 04-11-2009, 01:12 PM
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Yes, you need a tune that will alter your shift points. You also need a new speedometer gear for whatever gear ratio you went with, so your speedo is accurate.
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post #25 of 39 (permalink) Old 04-11-2009, 04:34 PM
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I'm about to install a Hypertech power module and was wondering if going with 3.73 gears would somehow interfere with the module? I'm new to upgrading the T-bird so please bear with me.
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post #26 of 39 (permalink) Old 04-11-2009, 06:03 PM
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Quote:
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Guess my question is, when you guys went from stock to 3:73's, did ya have to get a tune or if not, notice any strange side effects?
The reason for the tune is to tell the trans to shift earlier because with the faster acceleration, you might hit your rev limiter before the shift happens at WOT. You can also compensate for this in the trans though by doing the J-mod. When you drill the hole larger in the trans, the accumulator fills faster and the shift happens sooner, so by doing that and the gears, it should balance out and your shifts will be at the same points or at least close enough.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
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post #27 of 39 (permalink) Old 04-11-2009, 07:53 PM
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i have 3.73's mileage is 23.4 mpg in town, highway 27 mpg my car has 200,000 miles all the stuff in my sig etc. i wish i would have went with 4.10's thats just me though.

Mods: The usual stuff... 3.73 Gears, J-mod, catless mandrel 2.5" true duals, Marauder Converter, Eibachs, Xcal2 and Phoenix Gold Audio, chrome 18's, etc. etc..
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post #28 of 39 (permalink) Old 04-11-2009, 08:01 PM
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Hmmm You guys have me thinking about putting a 3.73 in the hogs head

But would it still be a Trac-lok ?

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post #29 of 39 (permalink) Old 04-11-2009, 08:41 PM
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If you have a trak-lok now, then swapping to 3.73s you would keep the TL. If you have an open diff, then get a TL unit, and do that and the gears at the same time.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
-97 Tbird Sport 4.6 Nice weather daily driver
-"Your buddy Mike is INSANE!" -ClintD's dad
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post #30 of 39 (permalink) Old 04-12-2009, 08:15 AM
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Thanks for the info Mike And yep she is a trak-lok .

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