285/75/R16's

bobs98tlr · 01-04-2009, 10:23 PM

Im gonna put some 285's on my 01 4x4...curious if you guys know of a different speedo gear that i would have to put in my tranny or whatever? How far off would my speedometer be if i didnt change anything. Just curious any info is helpful. Thanks.

__________________
01 2500 4x4 CTD QCLB, Edge Ez, silencer MIA, cut off stock exhaust, BHAF, AFE Bladerunner, Air Dog 100, RV275's

black01qcsb · 01-05-2009, 09:55 PM

it might be off 2 or 3 mph its not a big enough deal to get a gear to correct it

__________________
black 2001 2wd qcsb goerend billet,4.10's, juice with attitude, 5in fbd turbo back, black h2's 295/70/17 terra grap's 12k hid's

15.0 @91mph

mjd91 · 01-05-2009, 09:58 PM

I got 285 and it's a very minor difference.

__________________
2000 short, 4x4, 6 speed, 12.25" DD Valair, S.O.VP44, AEM Brute Force HD, FBD 5" with 6" tip, ADRENALINE!!!, AirDog II 165, AutoMeter Cobalts, 35" Mud Grapplers on 18" Black XD Diesels

1000EE-Monarch · 01-05-2009, 10:25 PM

The '01 is all electronic you can not change the speedometer ratio by swapping a speedo gear. Only way to do it is to reprogram the PCM.

Some of the programmers (Smarty) can reprogram the PCM for different size tires. Otherwise you'd have to take it to a shop to get it reprogrammed.

__________________
Alex K.
'01 3500 QC 4x4 NV5600 HO. Stock for now. BHAF, no silencer ring, muffler delete.
WANTED: '98 12v 3500 QC 4x4 5spd 3.55 gears

JasonY · 01-07-2009, 05:35 PM

Since the speed signal comes from the rear axle speed sensor and the wheel speed senders up front, the tire size shouldn't effect the speedometer.

Mine is off ~6mph from my GPS at 65. Which seems to be normal since i havnt owned a vehicle that the speedo is actually dead on accurate.

Jason

__________________
2001.5 Ext. Cab Short bed 4X4-315 BFG AT's/AEM HD intake/MBRP 4"/Silencer ring M.I.A/Raptor 100/new VP44/Mag deep trans pan/Edge EZ/RV275's/Quad Commander/Kool-Vue power/heated tow mirrors

1000EE-Monarch · 01-07-2009, 07:38 PM

Quote:

Originally Posted by JasonY

Since the speed signal comes from the rear axle speed sensor and the wheel speed senders up front, the tire size shouldn't effect the speedometer.
Jason

Yes the speed signal comes from the sensor in the rear end. However tire size does affect it, a larger tire will travel a longer distance down the road per revolution.

__________________
Alex K.
'01 3500 QC 4x4 NV5600 HO. Stock for now. BHAF, no silencer ring, muffler delete.
WANTED: '98 12v 3500 QC 4x4 5spd 3.55 gears

JasonY · 01-07-2009, 07:44 PM

Quote:

Originally Posted by 1000EE-Monarch

Yes the speed signal comes from the sensor in the rear end. However tire size does affect it, a larger tire will travel a longer distance down the road per revolution.

Wasn't thinking far enough into it

Jason

__________________
2001.5 Ext. Cab Short bed 4X4-315 BFG AT's/AEM HD intake/MBRP 4"/Silencer ring M.I.A/Raptor 100/new VP44/Mag deep trans pan/Edge EZ/RV275's/Quad Commander/Kool-Vue power/heated tow mirrors

m_reynolds · 01-07-2009, 11:31 PM

This website right here should help you out......

Tire Size Calculator

__________________
01.5 2500 QC 4X4 6spd, DRAG COMP, KENNY DD CLUTCH, Hardened Output Shaft, RSD 5" exhaust, AEM Bruteforce, FASS 150/150, HTT Exhaust Manifold, ISSPRO (FP, boost, pyro), Thanks to James at Rollin Smoke Diesel....

smokey burnouts · 01-07-2009, 11:50 PM

My Edge says i have the usual and expected 5mph difference with the 305's but the Garmin says its right on....

__________________
01 2500 4X4 QC LEVELED 35's on 17x10 KMCs: BHAF, JUICE(HOT), 150hp FIRESTORMS, 5" FBD STRAIGHT PIPED,J-HOOK, DTT VB, TCS 89% CONVERTER, BILLET SHAFTS, FDB BUILT TRANNY, HOLLEY PUMP, KIMBER 1911 SECURITY SYSTEM THANKS TO FARMBOYS DIESEL, WICKED DIESEL
WANT: 2500 5.9L 4x4 MEGA cab, handshaker, 6"lift on 37's, FBD 5", Smarty, gauges
www.myspace.com/74212921

01-04-2009, 10:23 PM	#1 (permalink)
bobs98tlr Cummins Fanatic Join Date: Sep 2008 Location: Roscoe, IL Posts: 101 Thanks: 0 Thanked 1 Time in 1 Post bobs98tlr's Truck Pics	285/75/R16's Im gonna put some 285's on my 01 4x4...curious if you guys know of a different speedo gear that i would have to put in my tranny or whatever? How far off would my speedometer be if i didnt change anything. Just curious any info is helpful. Thanks. __________________ 01 2500 4x4 CTD QCLB, Edge Ez, silencer MIA, cut off stock exhaust, BHAF, AFE Bladerunner, Air Dog 100, RV275's

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01-05-2009, 09:55 PM	#2 (permalink)
black01qcsb Diesel Freak Join Date: Jul 2007 Location: twentynine palms Posts: 758 Thanks: 0 Thanked 2 Times in 2 Posts black01qcsb's Truck Pics	it might be off 2 or 3 mph its not a big enough deal to get a gear to correct it __________________ black 2001 2wd qcsb goerend billet,4.10's, juice with attitude, 5in fbd turbo back, black h2's 295/70/17 terra grap's 12k hid's 15.0 @91mph

01-05-2009, 09:58 PM	#3 (permalink)
mjd91 Diesel Head Join Date: May 2008 Location: Copperas cove, Texas Posts: 3,873 Thanks: 15 Thanked 118 Times in 91 Posts mjd91's Truck Pics	I got 285 and it's a very minor difference. __________________ 2000 short, 4x4, 6 speed, 12.25" DD Valair, S.O.VP44, AEM Brute Force HD, FBD 5" with 6" tip, ADRENALINE!!!, AirDog II 165, AutoMeter Cobalts, 35" Mud Grapplers on 18" Black XD Diesels

01-05-2009, 10:25 PM	#4 (permalink)
1000EE-Monarch Cummins Nut Join Date: Jun 2008 Location: CA Bay Area Posts: 390 Thanks: 0 Thanked 3 Times in 3 Posts 1000EE-Monarch's Truck Pics	The '01 is all electronic you can not change the speedometer ratio by swapping a speedo gear. Only way to do it is to reprogram the PCM. Some of the programmers (Smarty) can reprogram the PCM for different size tires. Otherwise you'd have to take it to a shop to get it reprogrammed. __________________ Alex K. '01 3500 QC 4x4 NV5600 HO. Stock for now. BHAF, no silencer ring, muffler delete. WANTED: '98 12v 3500 QC 4x4 5spd 3.55 gears

01-07-2009, 05:35 PM	#5 (permalink)
JasonY Cummins Nut Join Date: Mar 2008 Location: Delaware Posts: 336 Thanks: 1 Thanked 14 Times in 13 Posts JasonY's Truck Pics	Since the speed signal comes from the rear axle speed sensor and the wheel speed senders up front, the tire size shouldn't effect the speedometer. Mine is off ~6mph from my GPS at 65. Which seems to be normal since i havnt owned a vehicle that the speedo is actually dead on accurate. Jason __________________ 2001.5 Ext. Cab Short bed 4X4-315 BFG AT's/AEM HD intake/MBRP 4"/Silencer ring M.I.A/Raptor 100/new VP44/Mag deep trans pan/Edge EZ/RV275's/Quad Commander/Kool-Vue power/heated tow mirrors

01-07-2009, 11:31 PM	#8 (permalink)
m_reynolds Diesel Freak Join Date: Jan 2008 Location: Waynesburg, KY Posts: 645 Thanks: 14 Thanked 2 Times in 2 Posts m_reynolds's Truck Pics	This website right here should help you out...... Tire Size Calculator __________________ 01.5 2500 QC 4X4 6spd, DRAG COMP, KENNY DD CLUTCH, Hardened Output Shaft, RSD 5" exhaust, AEM Bruteforce, FASS 150/150, HTT Exhaust Manifold, ISSPRO (FP, boost, pyro), Thanks to James at Rollin Smoke Diesel....

01-07-2009, 11:50 PM	#9 (permalink)
smokey burnouts SHOOTIN FOR 550HP!!! Join Date: Nov 2007 Location: From Anderson SC, Chesterfield VA for now Posts: 1,103 Thanks: 0 Thanked 1 Time in 1 Post smokey burnouts's Truck Pics	My Edge says i have the usual and expected 5mph difference with the 305's but the Garmin says its right on.... __________________ 01 2500 4X4 QC LEVELED 35's on 17x10 KMCs: BHAF, JUICE(HOT), 150hp FIRESTORMS, 5" FBD STRAIGHT PIPED,J-HOOK, DTT VB, TCS 89% CONVERTER, BILLET SHAFTS, FDB BUILT TRANNY, HOLLEY PUMP, KIMBER 1911 SECURITY SYSTEM THANKS TO FARMBOYS DIESEL, WICKED DIESEL WANT: 2500 5.9L 4x4 MEGA cab, handshaker, 6"lift on 37's, FBD 5", Smarty, gauges www.myspace.com/74212921