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Old 04-30-2011, 09:16 AM   #1
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Rear Gears!

Since I drive alot of highway driving and when my mustang is done , would it be ok to switch my gears to 3.73s? cause with these 4.10s my RPM is at 4000-4500 RPMs, and that's only at 60-70mph

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Old 04-30-2011, 09:24 AM   #2
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Re: Rear Gears!

What transmission are you running? Because no OD transmission should be at 4-4.5 at 70 w/ 4.10's.

-Will
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Old 04-30-2011, 09:35 AM   #3
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It's a aode rebuilt to hold up 550hp
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Old 04-30-2011, 10:15 AM   #4
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Re: Rear Gears!

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Originally Posted by Knight F Mohawk View Post
What transmission are you running? Because no OD transmission should be at 4-4.5 at 70 w/ 4.10's.

-Will
i bet with that trans he's running a non-lock up converter which is why the rpms are so high.

im at 22-2300rpm at that speed with 3.45's. with a racing aod, and it because my converter doesnt have a lock up.
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Old 04-30-2011, 10:30 AM   #5
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Could that be why sometimes it knocks me out of OD to 3rd gear ?..... I have a new 2800 torque converter from boss hog that has a lock up. Should I wait and see with the new TC how it rides?
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Old 04-30-2011, 10:46 AM   #6
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Re: Rear Gears!

nooo. that sounds like your trans. not having lock-up doesnt knock u into a lower gear.
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Old 04-30-2011, 01:03 PM   #7
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So if my torque converter is a non-lock up that would cause my RPMs to be 4000-4500 on the highway?
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Old 04-30-2011, 05:50 PM   #8
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Re: Rear Gears!

honestly im not sure if it would be that high or not. but it's usualy 250-300 rpm higher than a lock up. think of a lock up as being like a fifth gear. being that high though, it sounds like your trans is in 3rd. i think u hvae valve body or solinoid issues with your trans. even in a non lock up it stays in the correct gear, doesnt cause u to drop to 3rd.
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Old 04-30-2011, 06:50 PM   #9
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Quote:
Originally Posted by svtlx
honestly im not sure if it would be that high or not. but it's usualy 250-300 rpm higher than a lock up. think of a lock up as being like a fifth gear. being that high though, it sounds like your trans is in 3rd. i think u hvae valve body or solinoid issues with your trans. even in a non lock up it stays in the correct gear, doesnt cause u to drop to 3rd.
X2 now I was running a 5 speed with my last 4.10s but I was like 2600 at 75 if I remember right. U not getting into od
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Old 04-30-2011, 07:56 PM   #10
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Re: Rear Gears!

It sounds like you're riding in 3rd

-Will
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Old 05-01-2011, 08:53 AM   #11
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Well once my new motor is in and the new torque converter I'll see how it drives , but my question was ( how are 3.73s in a aode, compared to 4.10s )
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Old 05-01-2011, 06:51 PM   #12
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In my opinion, you should fix the problem of your transmission not going into overdrive first, see how it's working for you then, and then pose the question of whether or not you should switch to 3.73's. You might really like the 4.10s after you're in your final gear.
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Old 05-01-2011, 06:55 PM   #13
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Quote:
Originally Posted by 85GTPony
In my opinion, you should fix the problem of your transmission not going into overdrive first, see how it's working for you then, and then pose the question of whether or not you should switch to 3.73's. You might really like the 4.10s after you're in your final gear.
The car goes into overdrive because when I'm driving local I turn the overdrive off and when i push the red button on my shifter it kicks into overdrive,.... But sometimes (not everytime) on the highway I'm in overdrive and it'll shift down to 3rd then right back into OD, I I'm definitely getting that checked out tho !
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Old 05-01-2011, 07:17 PM   #14
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Well I'm just saying 4000-4500 on the freeway definitely Indicates you are not in overdrive. If you are in fact going into overdrive something is seriously wrong with your setup, like maybe your converter is just slipping like crazy constantly. In either case, yes you will need to fix whatever the problem is first!
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Old 05-01-2011, 07:23 PM   #15
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Re: Rear Gears!

It's almost impossible to answer "how are 3.73's compared to 4.10's". It really depends on your specific combo. With the right engine/cam/converter combo you wouldn't need as much gear....if you went with a different setup (something like a larger cam and less converter) then the 4.10's would almost be required.

It really depends on your combo. I would ask your engine builder what converter and gears they recommend

-Will
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Old 05-01-2011, 08:07 PM   #16
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Quote:
Originally Posted by Knight F Mohawk
It's almost impossible to answer "how are 3.73's compared to 4.10's". It really depends on your specific combo. With the right engine/cam/converter combo you wouldn't need as much gear....if you went with a different setup (something like a larger cam and less converter) then the 4.10's would almost be required.

It really depends on your combo. I would ask your engine builder what converter and gears they recommend

-Will
Ok will do! My head/cam/intake is Edelbrock Performer Heads and Intake , with trickFlow stage 1 cam
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Old 05-01-2011, 08:47 PM   #17
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Re: Rear Gears!

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Originally Posted by WhiteCobra94 View Post
Ok will do! My head/cam/intake is Edelbrock Performer Heads and Intake , with trickFlow stage 1 cam
wooot? your running a stage one with 4.10 gears. you would prolly definatley be happier with 3.55-3.73
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Old 05-01-2011, 09:00 PM   #18
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Yea, well when I bought the car 6 years ago it was bone stock and all I did to it was pulleys, full exhaust , 4.10s and lowered it, and last year I put a new trans in it, that car's been like that for 3-4 years now, and now she's getting a full make over !!!! I don't Mind fixing the problem and getting a set of 3.73s
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Old 05-01-2011, 09:02 PM   #19
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Re: Rear Gears!

im just fukn wit u. u may like the 4.10's
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racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 05-01-2011, 11:41 PM   #20
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Re: Rear Gears!

What converter?

-Will
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Old 05-02-2011, 12:44 PM   #21
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Quote:
Originally Posted by Knight F Mohawk
What converter?

-Will
I just bought the Boss Hog 2800 Stall
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