4.10 gears and RPMS
04-28-2010, 04:28 PM
#11
5th Gear Member
Join Date: Mar 2006
Location: MD, but NC for school
Posts: 2,374
I have an auto with 4.10s and at 77 mpg im right at 3000 rpm, i dont remember the other mph or rpm off hand, you do kinda wish you had another gear when on the highway, but around town its fun as hell
04-28-2010, 04:50 PM
#12
Thread Starter
Join Date: Apr 2010
Location: California
Posts: 7
Thanks guys for all the feed back. I believe I will be going with 4.10 gears see what heppens. For those who wanted to know how much HP and TQ I'll be making. well, we will have to wait until I take it to a dyno and a place where they can tune it. I live in Southern Cali and I don't know where to take my car for a good tune and dyno...(I mean a recognized place. If you guys know of any in California let me know...)
04-28-2010, 06:50 PM
#13
4th Gear Member
Join Date: Apr 2009
Location: sttesuhcaxaT (The State you love to hate)
Posts: 1,360
Hello guys I'm new to the Mustang forum and I have a couple of questions.
I was talking to a mechanic about an instalation of 4.10 gears in my 96GT mustang(Auto). He said this will be a big mistake," RPMS will be High, and in the freeway my spedometer will reach only up to 60-65 mph." Is this true? should I go with 3.73? My other question is; After driving, once I put the car in Park a Hissing sound comes from my transmission. Do you guys know what that might be? Mods on my car are: complete PI swap, comp Stage 2 cams, Underdrive pullies, Cold airs intake (K&N) Accufab plenum and throttle, B&M shift kit, TCI torque converter I don't remember if its 2400 or 3200 stall.
Mods to come: MM coil-overs and Blisteins schocks, cc plates, front lower control arms, rear lower control arms, bump steers, SLP Loudmouth 2, magnaflow Tru X pype and Bassani Midlength headers.
I was talking to a mechanic about an instalation of 4.10 gears in my 96GT mustang(Auto). He said this will be a big mistake," RPMS will be High, and in the freeway my spedometer will reach only up to 60-65 mph." Is this true? should I go with 3.73? My other question is; After driving, once I put the car in Park a Hissing sound comes from my transmission. Do you guys know what that might be? Mods on my car are: complete PI swap, comp Stage 2 cams, Underdrive pullies, Cold airs intake (K&N) Accufab plenum and throttle, B&M shift kit, TCI torque converter I don't remember if its 2400 or 3200 stall.
Mods to come: MM coil-overs and Blisteins schocks, cc plates, front lower control arms, rear lower control arms, bump steers, SLP Loudmouth 2, magnaflow Tru X pype and Bassani Midlength headers.
Your mech is full of crap.
04-28-2010, 08:13 PM
#14
4th Gear Member
Join Date: Nov 2009
Location: SoCal
Posts: 1,826
05-12-2010, 07:29 PM
#16
1st Gear Member
Join Date: Sep 2007
Location: Missouri
Posts: 82
A 1996 GT. I am not sure but I think you have a .67:1 4th gear ratio instead of the .70:1 on later models. That means your rpms will be about 5% lower than the newer cars. I don't think you can adjust the speedometer with a tuner. I think you are going to have to change the speedometer drive gear in the transmission.
The overdrive gear ratio makes a difference. I have a T-45 with 3.73 gears. I run approximately the same rpms at 70 mph as a T-3650 with 4.10s. My overdrive gear ratio is .67:1 (about the same as yours).
The overdrive gear ratio makes a difference. I have a T-45 with 3.73 gears. I run approximately the same rpms at 70 mph as a T-3650 with 4.10s. My overdrive gear ratio is .67:1 (about the same as yours).
05-12-2010, 08:05 PM
#18
6th Gear Member
Join Date: Oct 2006
Location: Texas
Posts: 10,551
I have 4.10s and wouldnt ever BUY anything taller. I am swapping to an IRS here pretty soon with 3.73s and im not gonna be happy. lol gonna take some getting used to. with a t45 im at about 2500rpm on the highway.. ull get used to it. I get about 26 mpg on the highway.
05-12-2010, 08:23 PM
#19
When does your IRS go in HOSS? And yea, mine will have the stock 3.55's in it so i aint gonna be anywhere near happy til they come out. but i will be able to launch harder if i take it to the track without spinning as much. Only benefit of taller gears in my opinion.
05-12-2010, 08:45 PM
#20
6th Gear Member
Join Date: Oct 2006
Location: Texas
Posts: 10,551
I dunno yet. we have to set something up. the big issue right now is I just had ankle surgery not to long ago and im on crutches for 6 weeks, and cant drive. SOOOOO... unless we can get some other dudes to help its not gonna be done untill around june 8th.
Im getting a 99 irs with 3.73s mm bushings, eibach pro-kit, upgraded pitman arms and endlinks, mac catback. Damn good trade if you ask me. my car is gonna be a straight smooth cruiser after the swap.
Im getting a 99 irs with 3.73s mm bushings, eibach pro-kit, upgraded pitman arms and endlinks, mac catback. Damn good trade if you ask me. my car is gonna be a straight smooth cruiser after the swap.