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Sled Pulling From Street to Pro-Mod, get your Sled Pulling fix here!

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Old 03-08-2019, 01:36 PM   #1
Crackas

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2.5 Puller 4.56 vs 4.88 Gears

I'm doing a gear swap in my 2012 and can't decide between 4.56 or 4.88. Will also be doing a spool in the rear and locker in the front with 35" tires at the same time. Target RPM is a minimum of 3500 but not looking to go over 4200 to stay in the charger and cam's sweet spot. I will also be swapping between the BOB 2.5 charger and a 2.6 smooth bore where I have to.
 
Old 03-08-2019, 06:09 PM   #2
pushlar84
 
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I’ve always ran 4.56’s
CR’s don’t need the extra gear imo
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2001 Ram- fuel by Northeast Diesel, 2.6 ED, Allison 1000. Haisley cam, engine & trans built in house
 
Old 03-08-2019, 06:19 PM   #3
Rich dzl
 
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1100 hp plus to run that gear (4.56) if the truck is hooking up
 
Old 03-08-2019, 06:58 PM   #4
Crackas

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Thanks guys. If i was strictly running the BOB 2.5 charger i think i could get away with 4.56 but being limited power wise with the 2.6 smooth bore has me concerned i won’t be able to stay on top of it. Should have also mentioned i have an nv4500 in it running direct. Right now I’m running 33” sts in direct with stock driveline and 3.73 averaging 33-3500 once the sled pulls it down at the end of the track.
 
Old 03-08-2019, 08:17 PM   #5
Rich dzl
 
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4.88 would be safest choice
 
Old 03-08-2019, 08:29 PM   #6
ryanss22
 
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If strictly a pulling truck and able to unlock front to steer go 4.88 rear 4.56 up front. That's what I'm running and does fine. I just unlock one hub up front to turn in the pits and hooking to sled
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96 fummins 12V puller, few other goodies

BUILT NOT BOUGHT!!!!to
 
Old 03-09-2019, 05:08 AM   #7
pushlar84
 
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Go on 4lo.com
There is a gear calculator, I use it all the time
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2001 Ram- fuel by Northeast Diesel, 2.6 ED, Allison 1000. Haisley cam, engine & trans built in house
 
Old 04-06-2019, 07:26 PM   #8
cummins.powered

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I’ll be building a 2.5 Truck soon also. Not trying to high jack your thread but Are you guys pulling in 4 gear and 4 low with these gear ratios?
 
Old 04-06-2019, 07:59 PM   #9
ryanss22
 
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Yes, with an nv4500 trans, 4lo, 4th gear, slip clutch a little then let it eat..
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96 fummins 12V puller, few other goodies

BUILT NOT BOUGHT!!!!to
 
Old 04-19-2019, 10:17 PM   #10
turboram
 
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456 gears
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70 dodge powerwagon 3" lps puller "Frank"
 
Old 04-21-2019, 11:58 AM   #11
Burningtire
 
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I was running 4.88s with nv4500, 241dhd. Was around 800hp in a 2.5 small frame/2.6sb class. If I stuck with the class I was gonna try the split ratio or 4.56 front and rear.

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Gots a two point five pullin truck!
 
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