Gearing

[JNavy1974]

I bought a 2003 1500 Silverado LS with a 4.8L. I put on a 2" leveling kit with a 1.5: body lift and put on 33" tires. I believe the current gearing is 3.42 but need to confirm. I tow a 17' with a sxs and quad that is around 3000 lbs. The truck really struggles on hills...even long hills with no tow it doesn't have as much power as I think it should have. I have been debating on changing the gears, but think it is possible it might be the cats starting to clog... The truck is rated for 8100 lbs tow and I am only towing 3000 lbs. Does this sound like a cat issue or does this gearing setup off? Thanks.

[carnau]

3 hours ago, JNavy1974 said:

I bought a 2003 1500 Silverado LS with a 4.8L. I put on a 2" leveling kit with a 1.5: body lift and put on 33" tires. I believe the current gearing is 3.42 but need to confirm. I tow a 17' with a sxs and quad that is around 3000 lbs. The truck really struggles on hills...even long hills with no tow it doesn't have as much power as I think it should have. I have been debating on changing the gears, but think it is possible it might be the cats starting to clog... The truck is rated for 8100 lbs tow and I am only towing 3000 lbs. Does this sound like a cat issue or does this gearing setup off? Thanks.

Get me the Vin and I can let you know.

[JNavy1974]

1 hour ago, carnau said:

Get me the Vin and I can let you know.

2GCEK19V431115715

[carnau]

On 3/27/2018 at 8:03 PM, JNavy1974 said:

2GCEK19V431115715

GT4 - REAR AXLE - 3.73 RATIO

[JNavy1974]

Is that what I have in there now, 3.73? I shouldn't be struggling that much then...wonder if I am losing power through the cats then...thanks for the info...i really appreciate it...

[JNavy1974]

One more question, when it comes to the tranny, how do you tell if you have a 4 or 6 speed? Thanks.

[diyer2]

41 minutes ago, JNavy1974 said:

One more question, when it comes to the tranny, how do you tell if you have a 4 or 6 speed? Thanks.

Serious?

 

[carnau]

51 minutes ago, JNavy1974 said:

One more question, when it comes to the tranny, how do you tell if you have a 4 or 6 speed? Thanks.

M30 - 4-SPD AUTOMATIC TRANSMISSION The reason it may be struggling is because it is a 4800 engine.

[carnau]

Here is your build.

 

1SA - BASE DECOR INCLUDES: * AIR COND, DUAL ZONE MANUAL * 40/20/40 SEATING 1SZ - PREFERRED EQUIPMENT SAVINGS 69C - DARK CHARCOAL - CLOTH 69I - DK PEWTER INTERIOR TRIM 6YH - COMPONENT FRT LH COMPUTER SEL 74U - VICTORY RED/LT PEWTER MET 7YH - COMPONENT FRT RH COMPUTER SEL AE7 - 40/20/40 SPLIT BENCH RECLINING FRONT SEAT AJ1 - DEEP TINTED GLASS AL0 - SENSOR INDICATOR INFLATABLE RESTRAINT FRT PASS AM7 - FOLDING REAR SEAT AU3 - POWER DOOR LOCK SYSTEM C7H - 6,400 LB GVW RATING CJ3 - AIR COND., DUAL ZONE MANUAL DE2 - BLACK FOLDAWAY EXTERIOR MIRRORS E63 - FLEETSIDE BODY EVA - EVAP EMISSION REQUIREMENT FE9 - FEDERAL/NY/VT EMISSIONS FK2 - TORSION BAR SPRING ADJUSTMENT FK3 - TORSION BAR SPRING ADJUSTMENT GT4 - REAR AXLE - 3.73 RATIO JC3 - 4 WHEEL POWER DISC BRAKES K34 - CRUISE CONTROL K47 - HIGH CAPACITY AIR CLEANER K68 - 105 AMP DELCOTRON GENERATOR KNP - HD AUX TRANSMISSION COOLING SYS KUP - THROTTLE CONTROL ELECTRONIC LR4 - VORTEC 4800 V8 SFI GAS ENGINE M30 - 4-SPD AUTOMATIC TRANSMISSION NF2 - FEDERAL EMISSION SYSTEM NP2 - MANUAL SHIFT TRANSFER CASE OSG - OSHAWA ASSEMBLY QNK - P245/75R16 ALS BW TIRES SLM - STOCK ORDERS UB0 - AM/FM STEREO W/CD PLAYER UQ5 - EXT RANGE SOUND FRT & RR SPKRS V73 - STATEMENT OF VEHICLE CERT.-U.S. /CANADA VB3 - CHROME REAR STEP BUMPER VG3 - FRONT DELUXE CHROMED BUMPER VK3 - FRONT LICENSE PLATE MOUNT VR4 - WEIGHT DISTRIB. PLATFORM HITCH VXS - COMPLETE VEHICLE LABEL X88 - CHEVROLET CONVERSION XNK - P245/75R16-109S ALS BW TIRES YD3 - BASE EQUIP FOR SCH GVW PL-FT AX YD6 - BASE REAR SPRING YNK - P245/75R16-109S ALS BW TIRES Z82 - HEAVY DUTY TRAILERING EQUIPMENT Z85 - HEAVY DUTY SUSPENSION ZNK - P245/75R16-109S ALS BW TIRES ZY1 - SOLID PAINT

[JNavy1974]

40 minutes ago, diyer2 said:

Serious?

 

Actually yes, I wasnt sure if it is in reference to the shifter or internally...some trannys actually have more shift points internally than you see at the shifter...correct?

[JNavy1974]

35 minutes ago, carnau said:

Here is your build.

 

1SA - BASE DECOR INCLUDES: * AIR COND, DUAL ZONE MANUAL * 40/20/40 SEATING 1SZ - PREFERRED EQUIPMENT SAVINGS 69C - DARK CHARCOAL - CLOTH 69I - DK PEWTER INTERIOR TRIM 6YH - COMPONENT FRT LH COMPUTER SEL 74U - VICTORY RED/LT PEWTER MET 7YH - COMPONENT FRT RH COMPUTER SEL AE7 - 40/20/40 SPLIT BENCH RECLINING FRONT SEAT AJ1 - DEEP TINTED GLASS AL0 - SENSOR INDICATOR INFLATABLE RESTRAINT FRT PASS AM7 - FOLDING REAR SEAT AU3 - POWER DOOR LOCK SYSTEM C7H - 6,400 LB GVW RATING CJ3 - AIR COND., DUAL ZONE MANUAL DE2 - BLACK FOLDAWAY EXTERIOR MIRRORS E63 - FLEETSIDE BODY EVA - EVAP EMISSION REQUIREMENT FE9 - FEDERAL/NY/VT EMISSIONS FK2 - TORSION BAR SPRING ADJUSTMENT FK3 - TORSION BAR SPRING ADJUSTMENT GT4 - REAR AXLE - 3.73 RATIO JC3 - 4 WHEEL POWER DISC BRAKES K34 - CRUISE CONTROL K47 - HIGH CAPACITY AIR CLEANER K68 - 105 AMP DELCOTRON GENERATOR KNP - HD AUX TRANSMISSION COOLING SYS KUP - THROTTLE CONTROL ELECTRONIC LR4 - VORTEC 4800 V8 SFI GAS ENGINE M30 - 4-SPD AUTOMATIC TRANSMISSION NF2 - FEDERAL EMISSION SYSTEM NP2 - MANUAL SHIFT TRANSFER CASE OSG - OSHAWA ASSEMBLY QNK - P245/75R16 ALS BW TIRES SLM - STOCK ORDERS UB0 - AM/FM STEREO W/CD PLAYER UQ5 - EXT RANGE SOUND FRT & RR SPKRS V73 - STATEMENT OF VEHICLE CERT.-U.S. /CANADA VB3 - CHROME REAR STEP BUMPER VG3 - FRONT DELUXE CHROMED BUMPER VK3 - FRONT LICENSE PLATE MOUNT VR4 - WEIGHT DISTRIB. PLATFORM HITCH VXS - COMPLETE VEHICLE LABEL X88 - CHEVROLET CONVERSION XNK - P245/75R16-109S ALS BW TIRES YD3 - BASE EQUIP FOR SCH GVW PL-FT AX YD6 - BASE REAR SPRING YNK - P245/75R16-109S ALS BW TIRES Z82 - HEAVY DUTY TRAILERING EQUIPMENT Z85 - HEAVY DUTY SUSPENSION ZNK - P245/75R16-109S ALS BW TIRES ZY1 - SOLID PAINT

Wow, thank you very much...

[carnau]

7 hours ago, JNavy1974 said:

Wow, thank you very much...

No problem!

[swathdiver]

FYI:  The 6-speeds were not introduced until the GMT900 platform beginning in 2007.

[JNavy1974]

2 hours ago, swathdiver said:

FYI:  The 6-speeds were not introduced until the GMT900 platform beginning in 2007.

Thanks, I did not know that...

 

[Volucris]

I have a 4.8 with 3:73 gearing, no lift, stock tires.  I think you are asking a of of the 4.8 to turn those 33's.  It just isn't all that powerful.