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03-10-2014, 12:02 AM
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#1
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Name: Rustin
Title: Let the Beatings Begin!
Status: Not Here
Join Date: Jul 2010
Location: Redding, CA.
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Posts: 2,212
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Front to rear gear ratios for pulling competition.
Do the rules for any of the clubs, allow you to run a different gear ratio on the front compared to the rear?
For example: If I decided to run 4:10 on the rear and maybe 3:73 on the front, or the other way?
I was just wondering if it made sense to run at a faster speed on the front drive axel, compared to the rear.
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Last edited by Rustin; 03-10-2014 at 12:03 AM.
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03-10-2014, 12:16 AM
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#2
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Name: 97crewcab
Title: Wrong.
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Join Date: Aug 2006
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Posts: 2,804
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I don't know why any rules would prevent you from doing a split gear ratio?
If a split ratio is used the front is faster than the rear. I know there are pullers using 4.56 front and 4.88 rears.
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03-10-2014, 12:19 AM
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#3
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Name: Nootch
Title: nosprkreqrd
Status: Not Here
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Location: Ft. Mcmurray
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not to derail the thread, but why do pullers run different gear sets? i have heard of this before. I am assuming its so the front "digs" harder and helps to pull weight forward?
__________________
Clever.Wise.Mechanic.
Spark plugs are for those who can't handle the pressure
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03-10-2014, 01:20 PM
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#4
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Name: Rustin
Title: Let the Beatings Begin!
Status: Not Here
Join Date: Jul 2010
Location: Redding, CA.
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Quote:
Originally Posted by Nootch
not to derail the thread, but why do pullers run different gear sets? i have heard of this before. I am assuming its so the front "digs" harder and helps to pull weight forward?
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This is why I started the thread. I have no clue, and I might want to get into the sport. It seems perfectly clear to run different gears.
__________________
If it has anything to do with Search Results, I make it happen!
Other then that, I'm a supporter and spectator of Diesel Power Sports!
It's better to ask for forgiveness, after the foot is inserted into mouth.
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03-10-2014, 01:38 PM
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#5
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Name: ClamDigger4
Title: Too Much Time
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Join Date: Feb 2010
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Rear tires bite way harder and It's tougher to keep the higher desired wheel speed. Front end doesn't bite as hard allowing more wheel speed.
phone
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03-10-2014, 01:41 PM
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#6
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Name: jones95runner
Title: Too Much Time
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Join Date: Jan 2010
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We've tried it. Truck always hopped on the big end. But not saying the gear was the whole problem. Run the same ratio now with pretty good results.
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03-10-2014, 02:38 PM
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#7
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Name: Supershafts
Title: We race, so You win
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Location: Long Island, N.Y.
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Posts: 421
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I wouldn't be using different ratios front to rear UNLESS i was playing with different tire heights.
Unless you're on ice, having different ratios is going to bite you, and EVEN on ice it'll bite you
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We Race!! We Vote!!
71 Dart 340, 73 RR 440-6pk clone, 78 Magnum GT, 85 W-350 Power Ram le cc, 91 Dodge daytona, 95 Jeep GC, 99 Dakota, 08 Dodge Ram 6.7
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03-10-2014, 03:40 PM
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#8
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Name: Rustin
Title: Let the Beatings Begin!
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Join Date: Jul 2010
Location: Redding, CA.
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Posts: 2,212
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Now we are getting somewhere! Thank you for bringing in some physics and experience into the picture.
__________________
If it has anything to do with Search Results, I make it happen!
Other then that, I'm a supporter and spectator of Diesel Power Sports!
It's better to ask for forgiveness, after the foot is inserted into mouth.
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03-10-2014, 03:49 PM
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#9
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Name: zstroken
Title: For $$$ your name here
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Location: Western Michigan(by the lake)
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Quote:
Originally Posted by Supershafts
I wouldn't be using different ratios front to rear UNLESS i was playing with different tire heights.
Unless you're on ice, having different ratios is going to bite you, and EVEN on ice it'll bite you
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I am not sure what you mean, I ran a faster gear and a larger tire on the same axle and never had an issue.
__________________
2008 4x4 Megacab, 68RFE
97 Dodge gone....
24V P-Pump Mafia member #1(retired)
Thanks to Mumau Diesel, Goerend Transmission, Northeast Diesel Service!
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03-10-2014, 04:02 PM
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#10
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Name: Supershafts
Title: We race, so You win
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Location: Long Island, N.Y.
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Posts: 421
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When the weight comes on, the truck is going into bind and you might as well hit the brakes running 2 different ratios front to back and using the same tire diameter.
If you have say 44 tire at the rear and 35 tire at the front , you would want a 4.90 at the rear and 3.90 at the front
__________________
We Race!! We Vote!!
71 Dart 340, 73 RR 440-6pk clone, 78 Magnum GT, 85 W-350 Power Ram le cc, 91 Dodge daytona, 95 Jeep GC, 99 Dakota, 08 Dodge Ram 6.7
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03-10-2014, 04:15 PM
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#11
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Name: ClamDigger4
Title: Too Much Time
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Quote:
Originally Posted by Supershafts
When the weight comes on, the truck is going into bind and you might as well hit the brakes running 2 different ratios front to back and using the same tire diameter.
If you have say 44 tire at the rear and 35 tire at the front , you would want a 4.90 at the rear and 3.90 at the front
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This is false seeing as wheel speed is always faster than ground speed on a properly set up truck.
phone
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03-10-2014, 05:01 PM
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#12
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Name: zstroken
Title: For $$$ your name here
Status: Not Here
Join Date: Sep 2006
Location: Western Michigan(by the lake)
Member`s Gallery
Posts: 23,151
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Quote:
Originally Posted by Supershafts
When the weight comes on, the truck is going into bind and you might as well hit the brakes running 2 different ratios front to back and using the same tire diameter.
If you have say 44 tire at the rear and 35 tire at the front , you would want a 4.90 at the rear and 3.90 at the front
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Quote:
Originally Posted by ClamDigger4
This is false seeing as wheel speed is always faster than ground speed on a properly set up truck.
phone
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Never saw a bind, or any hop. Again I ran a faster gear in the front as well as a larger tire in the front, so my front was definitely faster.
On pavement I might be concerned, but the slip we see on dirt isn't an issue.
__________________
2008 4x4 Megacab, 68RFE
97 Dodge gone....
24V P-Pump Mafia member #1(retired)
Thanks to Mumau Diesel, Goerend Transmission, Northeast Diesel Service!
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03-10-2014, 05:12 PM
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#13
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Name: JerrodGlover
Title: Pulling God
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Location: Grand Rapids, MI
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I have also run different ratios front and rear with the same size tire. Like someone stated your always spinning the tires pulling so no binding problems.
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03-10-2014, 06:10 PM
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#14
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Name: JL Builders
Title: On a quest for more power
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Join Date: Apr 2011
Location: Moseley Virginia
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Posts: 1,267
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Ive always heard of some of the old time gas guys doing this. But I never have.
Are you guys still running staggered gears?
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6.7 sled puller, cracked motor in half.... Nothing to show for it. But ready to try again.
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03-10-2014, 06:40 PM
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#15
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Name: JoeySlushr
Title: Green Behind the Ears
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Location: Land of 10000 Laws
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Posts: 79
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Most of the gassers do this (pry 700hp plus). I was told that it helps keep the truck straight going down the track
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03-10-2014, 06:49 PM
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#16
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Name: DISTURBED
Title: YEA WE RIDE THE SHORT BUS
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Join Date: Nov 2007
Location: Winchester, Va
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Posts: 6,417
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Quote:
Originally Posted by Supershafts
I wouldn't be using different ratios front to rear UNLESS i was playing with different tire heights.
Unless you're on ice, having different ratios is going to bite you, and EVEN on ice it'll bite you
|
Quote:
Originally Posted by Supershafts
When the weight comes on, the truck is going into bind and you might as well hit the brakes running 2 different ratios front to back and using the same tire diameter.
If you have say 44 tire at the rear and 35 tire at the front , you would want a 4.90 at the rear and 3.90 at the front
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This is completely incorrect. Even in the OEM stock gears the front is always faster then the rear. If it wasn't then when in 4wd the rear would try to push the front binding the tcase. With the front being faster it pulls the rear along. in pulling we run a faster gear in the front sometimes. Since the back is doing 75% of the work you over drive the front to get more traction from the front end. If the front and rear are close to the same then you only get the same speed out of the front as the rear. By over driving it you are essentially getting more cleat on the ground per foot traveled which would be a greater pulling force to help the rear keep the truck moving. I ran a 36" tire on the front and a 35" on the back will do the same thing. You can safely over drive the front 7%. Some do more but much more then that gets sketchy
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01 CTD Retired sled puller, dedicated "Twin Turbo" tow rig
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Last edited by DISTURBED; 03-10-2014 at 06:52 PM.
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03-10-2014, 07:17 PM
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#17
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Name: Nootch
Title: nosprkreqrd
Status: Not Here
Join Date: Jan 2013
Location: Ft. Mcmurray
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Posts: 1,359
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thank you for that post Disturbed. Makes a lot of sense. as well as the tracking comment JoeySlushr made.
__________________
Clever.Wise.Mechanic.
Spark plugs are for those who can't handle the pressure
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03-10-2014, 08:31 PM
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#18
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Name: JL Builders
Title: On a quest for more power
Status: Not Here
Join Date: Apr 2011
Location: Moseley Virginia
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Posts: 1,267
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I've been thinking about running a 5.13 in the rear with a 4.88 in the front.
__________________
6.7 sled puller, cracked motor in half.... Nothing to show for it. But ready to try again.
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03-10-2014, 08:55 PM
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#19
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Name: zstroken
Title: For $$$ your name here
Status: Not Here
Join Date: Sep 2006
Location: Western Michigan(by the lake)
Member`s Gallery
Posts: 23,151
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Quote:
Originally Posted by JL Builders
I've been thinking about running a 5.13 in the rear with a 4.88 in the front.
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I would think with a 6.7 CR that you would want a 4.56 in the front and a 4.88 in the rear.
__________________
2008 4x4 Megacab, 68RFE
97 Dodge gone....
24V P-Pump Mafia member #1(retired)
Thanks to Mumau Diesel, Goerend Transmission, Northeast Diesel Service!
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03-10-2014, 09:53 PM
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#20
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Name: JL Builders
Title: On a quest for more power
Status: Not Here
Join Date: Apr 2011
Location: Moseley Virginia
Member`s Gallery
Posts: 1,267
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Quote:
Originally Posted by zstroken
I would think with a 6.7 CR that you would want a 4.56 in the front and a 4.88 in the rear.
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I've thought about that too. I currently have all 4.88s.
__________________
6.7 sled puller, cracked motor in half.... Nothing to show for it. But ready to try again.
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