THE BIG SHIBANG
On Wednesday, Jan 5th, i had my motive 3.90 gears installed to my 2004 Mustang GT 5 speed. You can see what mods i have in my signature. My brother is an oil change tech at the local ford dealership, so he had a connection with the rear end tech guy. He agreed to install the gears for me, under the table for $150. (not including the price of gears, and a bearing, and some shims, and gear oil and lube.) I purchased my gears from www.mustangtuning.com
for 152.99 including shipping. I also paid 47$ at the dealership for all the little extra parts that were needed to complete the install. (bearing, shims, fluid) I also purchased a Dallas Mustang Speedo Recal from Ninosport for 90$ shipped. (best price on the internet).
3.73's, 3.90's or 4.10's???
I decided to go with 3.90's...after a long, and agonizing debate on whether i should get 3.73 or 4.10's. It didnt take me long to totally and completely rule out any thought of getting 3.73's. Considering all the not so positive reviews about them. i.e. not enough bang for the buck. I was going to get 4.10's...but after watching those videos that somebody made of daily driving with his 4.10's in his car... http://forums.stangnet.com/showthread.php?t=521948
i quickly realized that for freeway use...those gears were just too steep. They put you at too high of an rpm. I truelly wanted to get 4.10's on my car, however, based on my normal driving routine they just seemed to be too much gear. I will say again: If i didnt have as much freeway driving, i would certaintly have purchased 4.10's. ill get into that a little bit more later in this review.
So i made the big decision to go with 3.90's....many considered this a gamble since ford doesnt make that size gear. But after talking to a guy who installs gears daily, for a living...i was assured that THE ONLY THING THAT COULD CAUSE GEAR WHINE IS THE QUALITY OF THE INSTALL. He also told me that 3.90's are a tricky gear to install in mustangs. Therefor to have somebody who KNOWS what they are doing, install them, because just because your good at installing 3.73's, or 4.10's on a mustang, doesnt mean you will be 100% successfull with the 3.90's. I was going to have this gentleman install them on my car. He was a ford tech for 7 years, and now is he gear man at a local performance shop. he was going to charge me 200 for the gear install, not including parts. He was also going to install my DM speeo for 60$. I really wanted to have this guy do the install...i talked to him a few times...and he reallly seemed to know his ****. But my brother convinced me to have his tech buddy at ford do it, for cheaper. In a way i was reluctant, but i figured who better to do it than somebody that actually works at ford, and in the process save a few bucks.
THE DAY OF THE INSTALL:
I had the gears at my house..and waited nearly two weeks for a day that my gear installer would have a chance to install them. (since he was doing it on work hours, he had to do them on a day that wasnt going to be very busy.)
It was wednesday the 5th, and was a normal work day for me. I went home for my hour lunch break. When i got home i decided to call my bro to see whats up, mainly to see when my damn gears could go in. My brother made my day when he said "dude...bring your car down here, he can do it this afternoon for sure" My heart was racing. I hastly made a sandwich and downed it faster than any other BLT in history. Got in my car and drove 10 minutes to the dealership. I dropped off my car, with the gears and took my brothers mustang (my old one) back to work. I seriously thought about it alllll day. I checked the clock every minute, waiting impatiently for 4 o'clock to come, so id be off of work, and could go get my car. the tech guy started working on it at 2pm..and said it would take almost 3 hours to install. So i figured i would have plenty of time to go home, get changed, and go to the dealership just intime for the install to be finished. i arrived at the dealership at 430. i walked right up to my car as he was installing them. i was realllly neet to see what the inside of a gear box looks like. But i quickly left the pit area so i wouldnt interfer with his concentration for my precious gear install. Which i have to admit was VERY nerve wracking for me. You fellas have no damn idea how nervious i was about gear whine. scared *****less. I go talk to my bro while he changes some other cars oil. My bro said the install was going well. Another guy (that i knew from high school) came over to say hello. In a nut shell he told me that the gear installer had been having a difficult time with the install. Quote "pain in the *** to line them up right" he told me he spent 30 minutes alone doing that. I got kinda nervious...but my buddy assured me that he got everything in there right, it just took a little longer than other gears he had done. I breathed a sigh of relief. My tech finally finished installing them at about 540. Yes it was a long install. He went out and took it for a test drive with another tech to see if they felt right. I heard them tear *** out of the car lot, lol. But i didnt care, cuz i figured he was doing what he needed to do to see if they were properly set up. he came back 5 minutes later. He told me they felt great, and the install was a success. I of course asked "does my car feel fast?" lol. he replied "well, we only got sideways once" i laughed. The guy looked incredibly tired though. it was almost 6pm..and he normally leaves at 4 pm. not to mention, having your hands about your head for a few hours on end is very tiring. I asked him about how difficult it was to line the gears up..he said that it was a b!tch. he mentioned that he installed those same exact gears on his car (not a mustang) and had no problem. this proved the point that 3.90's are definitly tricky to install on mustangs. But he assured me that the install was successful. I told him that i felt i should pay him more than 150 because of the difficulty. he said no, dont worry about it..but i could TOTALLY notice that he wanted to say "damn right you should pay me more" ..but he didnt say that. I have him 200$. i believe, and so did he, that 200$ was a fair payment. I mean...most people have their gears installed for over 300$.
BREAKING THE GEARS IN:
I pulled out of the car lot just dying to see what my car could do. But my tech guy told me to take it easy for 500 miles. I didnt like the sound of that. I have heard numerous people say that you should drive the car around, heat up the gears, let the gears cool down, 3 times and then they are fine to beat on. I have a buddy with a 12 second 5.0 (his second) he had 3.73s on both cars, and never broke them in at all. he told me both cars..he beat the **** out of it the second after leaving the installer, and he never had any problems. I decided that i would take it easy for several days....give my car around a dozen times to heat up, and cool down. During this process i never really took it over 3k rpms. I was amazed to see just how fast the rpms get to 2k. (where i normally shift at) 1st gear goes very fast... as i expected it too. But its not TOOO fast. Not nearly fast enough to where you'd want to start in 2nd or something. So ya, i took it very easy on the gears. I took the car out 3 times wednesday night. Waiting an hour between my 20 minute drives. The next day, thursday...i took it out a few times (to, and from work) and took it easy as well. Thursday night i took her out for a 25 minute drive with a buddy. I did, floor it in 2nd..and quickly noticed that it pulls just about as hard has 1st used to. *impressive* but i took it easy after that. I had my buddy pull along side me so we could see just how fast i was going. (it was difficult driving around for 24 hours not knowing exactly how fast i was going..but i had a feeling it was around 10mph too fast. So i told my buddy to drive along side me at exactly 45 mph
...my speedo said i was going about 54mph. so now i just drive 10mph faster on my speedo than what the speed limit is. I continued to take it easy all day friday, with the exception of accelerating quickly a few times, but never going over 4k. Actually i was curious to see how fast my rpms would go up in 1st...so i gave it half throttle one time..and wow..i was at 4k before i knew it. *impressive* last night, saturday night..i did quite a bit of driving. i went out with some friends...and practically drove all over town to a few places we went. That gave my gears a great chance to heat up and cool down a few times. I decided when i got home, that my gears were pretty much broken in. I took the stang out this afternoon. i drove it around for about 15 miles before getting on it.
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