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07-09-2011, 03:09 PM
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#1
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SRT Member
Join Date: Nov 2010
Location: Oklahoma
Name: Colton
Age: 29
Posts: 1,513
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Gear ratio
Stock my truck came with 3.55's. But the cover on the differential has been taken off before. I can tell because it has the red seal coming out the sides. Im wondering if someone put 3.92's in it before me. Is there anyway i can figure it out?
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07-09-2011, 04:45 PM
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#2
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V8 Member
Join Date: Nov 2010
Location: Texarkana, TX
Name: Mark
Age: 36
Posts: 697
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Jack up the rear end and count how many times the wheel spins when you turn the driveshaft once.
At least, I think that's how you do it lol
Sent from my iPhone 4 using Tapatalk
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07-09-2011, 05:52 PM
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#3
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SRT Member
Join Date: Nov 2010
Location: Oklahoma
Name: Colton
Age: 29
Posts: 1,513
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How many times should the wheels spin if their 3.92's?
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07-09-2011, 06:05 PM
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#4
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V8 Member
Join Date: Dec 2010
Location: Harker Heights, TX
Name: Garner
Age: 29
Posts: 525
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__________________
 2012 Ram 1500 Lonestar crew cab with frontier front bumper replacement
 
Gone but not forgotten:Best time: 14.7402 @87.53 on bald goodyear fortera sl 285 45 22 in 2500 DA. Corrected to 14.301 @ 90.28. 2011 Ram R/T
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07-09-2011, 06:07 PM
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#5
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V8 Member
Join Date: Nov 2010
Location: Texarkana, TX
Name: Mark
Age: 36
Posts: 697
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3.92 times
And I had it backwards. Spin the tire once and count how many times the yoke spins lol
Sent from my iPhone 4 using Tapatalk
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07-09-2011, 06:44 PM
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#6
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SRT Member
Join Date: Nov 2010
Location: Oklahoma
Name: Colton
Age: 29
Posts: 1,513
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Thanks Garner! I'll have to try that sometime
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08-10-2011, 04:48 PM
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#7
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R/T Member
Join Date: Oct 2010
Location: Sebastian, Florida
Name: Cory
Age: 33
Posts: 816
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or just pop the cover off, and check the numbers that are stamped into the ring gear, then divide the larger number by the smaller one to get your ratio...
*just an example* your numbers are 41 and 10 41/10= 4.11 which means you have a 4.11 ratio
those numbers are the amount of teeth on each gear, the larger number is the # of teeth on the ring gear, and the smaller # is the # of teeth on the pinion gear.
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'01 Silver Ram 1500 4x4 SLT Off Road Quad Cab 5.9L Auto Ya, it wants to be a 6 cylinder...Cummins that is.
My name is Ram, and I wish I was a 24v cummins.
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08-10-2011, 06:01 PM
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#8
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Turbo Member
Join Date: Feb 2011
Location: Virginia/Philippines
Name: PI_greg
Posts: 1,370
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jack both wheels off the ground, turn the wheel one full turn and count the shaft turns. 3-1/2 turns =3:55
<4 turns =3:92
4> turns =4:10
4-1/2 turns =4:56
If both wheels turn in the same direction, you some kind of traction control
If the opposite wheel turns the opposite direction, it's an open rear end.
Good luck.
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PI_greg 2003 SXT-Hemi, SS/T rims, 275/60-17, AeroForce, w/wideband, 6.1 ignition, K&N-77 CAI, Fastman TB, eFan, 180 stat, TMR, HD OEM Trans Cooler, SC3865/PSC1, Dual window switch/ high idle mod, Edge, Crazy Spartan (112 lsa), 2800, DTT 4:10, TCI Floor Shifter, Shift lite, Pacesetter Ceramic LT's, Magna Spun Cats/SI/DO Muffler, Mcgaughys 2/4.5 spindle kit, Monroe shocks, Caltracs, Aeon springs bumps, SRT-10 gage pillar, air horn
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08-10-2011, 06:51 PM
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#9
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R/T Member
Join Date: Oct 2010
Location: Sebastian, Florida
Name: Cory
Age: 33
Posts: 816
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Originally Posted by Redtruck-VA
jack both wheels off the ground, turn the wheel one full turn and count the shaft turns. 3-1/2 turns =3:55
<4 turns =3:92
4> turns =4:10
4-1/2 turns =4:56
If both wheels turn in the same direction, you some kind of traction control
If the opposite wheel turns the opposite direction, it's an open rear end.
Good luck.
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hes trying to see if hes got the 3.55 or the 3.92, which would be a hard difference to tell in turning the tires
but that is a very good method
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__________________
'01 Silver Ram 1500 4x4 SLT Off Road Quad Cab 5.9L Auto
Ya, it wants to be a 6 cylinder...Cummins that is.
My name is Ram, and I wish I was a 24v cummins.
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08-10-2011, 07:05 PM
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#10
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Newb
Join Date: Oct 2010
Location: Tallahassee, FL
Name: Mike
Posts: 47
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Originally Posted by 004x41500
hes trying to see if hes got the 3.55 or the 3.92, which would be a hard difference to tell in turning the tires
but that is a very good method
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Why? There's enough difference in 3 1/2 and 4.
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__________________
2003 Ram QCSB Hemi
Lotsa mods, but here are the highlights:
Hellwig RSB
TrueFlow CAI
Magnaflow SIDO Cat-back
ARE Tonneau
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2006 Chrysler 300C
Bentley Grill
Splash Guards
aFe Stage II CAI
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2001 Dodge Ram
1997 Dodge Ram
QCSB SLT Hemi
Linear Mode
