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Automatic Tranny Gear Ratios
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Topic: Automatic Tranny Gear Ratios (Read 450 times)
G-rod
Wheeler
Offline
Posts: 44
95 hardbody
Automatic Tranny Gear Ratios
«
on:
July 03, 2012, 11:04:03 AM »
I am trying to decide whether to buy calmini crawler gears, but I have searched everywhere for what gear ratios are in the 95 RE4R01A automatic transmission. I need to determine what my crawl ration will be. I have also heard that the torque converter adds an additonal gear reduction. Anyone got any info on this subject?
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OffroadX
One Whom Trees Fear
TrailBoss
Offline
Posts: 1,019
7617 original NOR posts, nyah!
Re: Automatic Tranny Gear Ratios
«
Reply #1 on:
July 04, 2012, 02:03:04 PM »
The TC doesn't add gear reduction in a useful way as far as torque goes, but it the fact that it slips does allow for a practical reduction ratio-wise in that more engine RPMs result in fewer RPMs going out the the transmission than if it were direct drive. Make sense?
Ratios:
1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.694
So your ratio is 2.785 x 3.92 x (4.36 or 4.63) = 47.6:1 or 50.6:1 mathematically, but could easily be double that depending on the amount of TC slip. On the other hand TC slip is a bad thing as far as building heat in the transmission, so it's best to not rely on slip and know when to back off.
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Eat your Jello with a straw! (really, try it!)
When did you last check your spare tire pressure?
sexy6chick
Ask Me 'Bout My 1st Gear!
Administrator
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Posts: 4,217
Re: Automatic Tranny Gear Ratios
«
Reply #2 on:
July 04, 2012, 02:19:40 PM »
If you have the 4cyl you might luck out if Calmini has some on the shelf. They have stopped manufacturing the crawler gears, just fyi.
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SASed 2002 S/C 4x4 Nissan Frontier
1980 Jeep Wagoneer D44 Front Axle, Procomp springs up front, 63" Chevy Springs in rear, Custom Penski Front/Rear Bumper, Sliders, Skids, and Roofrack, 35" BFG KM2's, 15" Cragar Soft 8 Steelies
OffroadX
One Whom Trees Fear
TrailBoss
Offline
Posts: 1,019
7617 original NOR posts, nyah!
Re: Automatic Tranny Gear Ratios
«
Reply #3 on:
July 04, 2012, 06:42:40 PM »
There are no automatic 4-bangers that I'm aware of.
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Eat your Jello with a straw! (really, try it!)
When did you last check your spare tire pressure?
G-rod
Wheeler
Offline
Posts: 44
95 hardbody
Re: Automatic Tranny Gear Ratios
«
Reply #4 on:
July 05, 2012, 05:02:53 AM »
So calmini is no longer making crawler gears? May have to go with the AC version. So the Torque Converter allows for slippage and that is where the reduction comes in. Is there a good approximation at what the amount of reduction could be at 1500rpm?
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OffroadX
One Whom Trees Fear
TrailBoss
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Posts: 1,019
7617 original NOR posts, nyah!
Re: Automatic Tranny Gear Ratios
«
Reply #5 on:
July 05, 2012, 05:07:16 PM »
Not that I'm aware of. Depends on just how much the wheels are fighting back and how much load you're putting on things.
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Eat your Jello with a straw! (really, try it!)
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bluztravler
Wheeler
Offline
Posts: 67
RuttNutts Offroad Canada
Re: Automatic Tranny Gear Ratios
«
Reply #6 on:
July 21, 2012, 06:14:53 AM »
automatic you say
I think a tranny cooler should go in first.
Heat will kill the trans, big tires, aggressive driving.
Even an electric fan is not a bad idea, off road your rig isn't moving so fast and its not pushing air though the rad.
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