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Old 09-24-2009, 06:48 PM
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What gears should I runn with my 700r4?

I recently put a 700r4 in my 68 el camino with a new 383 stroker (i think it puts out 450-500hp)

I have eaton 3.08's in my 12 bolt with a eaton posi unit.

when I am in overdrive on the highway, it seems as though I have to go 80-90mph or the motor bogs and runs at to low of a rpm, granted I dont have the motor fully tuned, but I also don't have the lock up switch hooked up yet.

what would be a good gear ratio to still keep a healthy highway speed, yet give me some fun around town?

Of course I want gears to make the car more fun, but I want a balance of that with 75-80 mph at or around 2000-2300 rpms. (less than 3k rpm's is ideal) on the highway. I really don't need to cruise at more than 80. I am a young guy driving a hot rod, which makes me enough of a ticket magnet.

thanks for the help

dustin

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Old 09-24-2009, 06:51 PM
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Seems like some 4:11 would work nice...
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Old 09-24-2009, 07:39 PM
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Here's a calculator to play with. Just input your Tire Dia., rpm you want to turn on the Highway etc.. 700R4's 4th gear is .70
Cruise rpm will depend on your cam's suggested rpm range or mileage will suffer.
http://hotrodworks.net/hotrodmath/quarter.html
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Old 09-24-2009, 07:49 PM
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Quote:
Originally Posted by SSedan64
Here's a calculator to play with. Just input your Tire Dia., rpm you want to turn on the Highway etc.. 700R4's 4th gear is .70
Cruise rpm will depend on your cam's suggested rpm range or mileage will suffer.
http://hotrodworks.net/hotrodmath/quarter.html

really cool!

has me doing 96.5 mph at 2500prm
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Old 09-24-2009, 07:52 PM
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Quote:
Originally Posted by pittbull7934
really cool!

has me doing 96.5 mph at 2500prm
my cam is rated at 2000-6000 rpms, what would ideal for me on the highwaY?
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Old 09-24-2009, 07:54 PM
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You didn't mention tire size, I run a 700R4 in my Malibu with 3.73 gears and 235/60/15 tires (26 inches tall) and it runs 2000 at 60 with the converter locked up.
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Old 09-24-2009, 09:21 PM
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3:50 to 3:70, 4:11 is too much for highway use.

Vince
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Old 09-24-2009, 11:03 PM
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I have a 3:50 with a 383 stroker and the 700r4. It is plenty lower enough. I wish I could get it locked up a little better. I think I weigh about 3,000 it is a steel body 39 4 door sedan with FG fenders. My tires are 25".

Last edited by Hoot Owl; 09-24-2009 at 11:08 PM.
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Old 09-24-2009, 11:14 PM
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Quote:
Originally Posted by Hoot Owl
I have a 3:50 with a 383 stroker and the 700r4. It is plenty lower enough. I wish I could get it locked up a little better. I think I weigh about 3,000 it is a steel body 39 4 door sedan with FG fenders. My tires are 25".

I think I am at about 3300-3500lbs with my Elky
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Old 09-26-2009, 07:19 AM
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i have a 383, 274 comp cam , 420 hp, 31 tires , 4:56 gears.
does great on the high way. cruise at 2000- 2500 what ever you like.
i also have a switch to turn the lockup off for town puttin' around .

THE SILVER BULLET (64 nova)
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Old 09-26-2009, 08:32 AM
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After playing with the calculator and talking to my rearend guy, I am pretty sure I am going to go with 3.73 that puts me going 74 mph at 2500 rpm
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Old 09-26-2009, 09:22 AM
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[QUOTE 4:11 is too much for highway use.

Vince[/QUOTE]

Not when you use a 700R...
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Old 09-26-2009, 09:24 AM
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Quote:
Originally Posted by pittbull7934
After playing with the calculator and talking to my rearend guy, I am pretty sure I am going to go with 3.73 that puts me going 74 mph at 2500 rpm

The 3.73's is a very good gear..
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Old 09-26-2009, 11:33 AM
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all depends on the dia. of the tires !
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Old 09-26-2009, 01:24 PM
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I have one car currently with a 4L60E (same ratios as your 700) and 3.08s with 255/45-17s. Its pretty much perfect for the highway, but my cam is much milder than yours. I'm actually making lots of torque at the 1800 rpm cruise range.

3.42s would be a nice step, but 4.10s would be a waste on the street. The problem isn't so much the highway RPMs, its the stupid 3.06 first gear in the tranny. GM did that in the 70s to compensate for the ridiculous 2.27-2.90 gears they were using in the axles.

Do it this way... multiply your axle ratio by the first gear ratio. In your case 3.08 x 3.06 = 9.42. Shoot for somewhere between 10.5-11.5 depending on tire size. 4.10 x 3.06 = 12.5. That's too much. First gear won't be effective. It will just blow through it too fast. If we were talking about a 200-4r, that would be different since it has a more sensible first gear.

Are you using a lockup converter? If so, pick a cruise RPM that suits the cam. If you aren't using a lockup converter, your cruise RPM needs to be higher than the stall speed. Otherwise you'll be in a highly inefficient point of converter operation, you'll waste fuel, and burn up the transmission from all the heat you're making. When it comes to cruise RPM less is NOT better as you are finding out. If you put it too far below the torque peak it lugs which wastes fuel big time. I would shoot for 2000-2200 rpms if your cam is of the duration I think it is.

The transmission ratios play a huge role. Take this example. My 4L60e/3.08 combo above is getting a T56 in its place. In order to keep the same basic ratio spread I have to swap to 4.10s and my cruise RPM will actually drop a little. The 700r4 ratios range from 3.06 to 0.70. T56 ratios go from 2.66 to 0.50.

Last edited by curtis73; 09-26-2009 at 01:29 PM.
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