LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

2003 LQ4 swap

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Old 01-27-2013 | 07:46 AM
  #51  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

grinding and painting pedal lever
Attached Thumbnails 2003 LQ4 swap-227668_509980099042238_250203230_n.jpg   2003 LQ4 swap-428980_509980162375565_1312325844_n.jpg   2003 LQ4 swap-603038_509980222375559_34524305_n.jpg  
Old 01-27-2013 | 07:47 AM
  #52  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

pedal assembly mounted
Attached Thumbnails 2003 LQ4 swap-603040_510613878978860_132939850_n.jpg   2003 LQ4 swap-481189_510613892312192_1638634786_n.jpg  
Old 01-27-2013 | 07:50 AM
  #53  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

removed all unneeded wires, rerouted wiring and wrapped in felt tape to reduce noise of wires behind dash, its amazing how much excess wiring is behind these dashes especially when your doing one of these swaps
Attached Thumbnails 2003 LQ4 swap-226681_509577222415859_327012487_n.jpg   2003 LQ4 swap-226735_509577349082513_468490064_n.jpg   2003 LQ4 swap-537983_509577479082500_1688778011_n.jpg  
Old 01-27-2013 | 07:54 AM
  #54  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

sound deadening layers first vibration layer next insulation layer finally noise layer from www.sounddeadenershowdown.com
Attached Thumbnails 2003 LQ4 swap-734706_509668369073411_531425312_n.jpg   2003 LQ4 swap-227713_509668395740075_1164336912_n.jpg   2003 LQ4 swap-603053_509668425740072_880899998_n.jpg  
Old 01-27-2013 | 07:55 AM
  #55  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

installing HVAC box and dash reinstalledAttachment 253038
Attached Thumbnails 2003 LQ4 swap-312301_509668449073403_7432630_n.jpg   2003 LQ4 swap-394930_510613842312197_321094749_n.jpg  
Old 01-27-2013 | 08:05 AM
  #56  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

TAC module mounted, cruise control and throttle pedal wires routed
Attached Thumbnails 2003 LQ4 swap-484739_519334491440132_288180831_n.jpg  
Old 01-27-2013 | 09:46 AM
  #57  
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From: Dixon, IL
Car: 91 RS
Engine: LTwon
Transmission: T-56
Axle/Gears: Both
Re: 2003 LQ4 swap

Movin right along!
Old 07-12-2013 | 10:20 AM
  #58  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Bulkhead connector wired
Attached Thumbnails 2003 LQ4 swap-bulkhead-engine-side.jpg   2003 LQ4 swap-bulkhead-interior-side.jpg  
Old 07-12-2013 | 10:23 AM
  #59  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

fuse block installed,OBD2 block installed,oil pressure switch installed
Attached Thumbnails 2003 LQ4 swap-fuse-block-installed.jpg   2003 LQ4 swap-obd2-port.jpg   2003 LQ4 swap-oil-pressure-sender.jpg  
Old 07-12-2013 | 10:24 AM
  #60  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

braided oil cooler lines installed and new transmission harness installed
Attached Thumbnails 2003 LQ4 swap-braided-transmission-cooler-lines   2003 LQ4 swap-braided-transmission-cooler-lines.jpg   2003 LQ4 swap-new-transmission-harness-installed.jpg  
Old 07-12-2013 | 10:25 AM
  #61  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

transmission pan cleaned inside and out
Attached Thumbnails 2003 LQ4 swap-pan-cleaned-outside.jpg   2003 LQ4 swap-pan-cleaned.jpg  
Old 07-12-2013 | 10:30 AM
  #62  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

alternator , power steering pump and balancer installed
Attached Thumbnails 2003 LQ4 swap-alternator-installed.jpg   2003 LQ4 swap-engine-bay-power-steering   2003 LQ4 swap-balancer-installed.jpg  
Old 07-12-2013 | 10:31 AM
  #63  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

belt installed and radiator installed
Attached Thumbnails 2003 LQ4 swap-belt-installed-2.jpg   2003 LQ4 swap-belt-installed.jpg   2003 LQ4 swap-radiator-installed.jpg  
Old 07-12-2013 | 10:32 AM
  #64  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

cold air intake
Attached Thumbnails 2003 LQ4 swap-cold-air-intake.jpg   2003 LQ4 swap-cold-air-intake-2.jpg   2003 LQ4 swap-engine-bay-cold-air.jpg  
Old 07-12-2013 | 10:38 AM
  #65  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Lokar dipstick installed, filling oil and cranking oil pressure
Attached Thumbnails 2003 LQ4 swap-lokar-transmission-dipstick.jpg   2003 LQ4 swap-filling-oil.jpg   2003 LQ4 swap-cranking-oil-pressure.jpg  
Old 07-12-2013 | 10:39 AM
  #66  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

y-pipe start
Attached Thumbnails 2003 LQ4 swap-y-pipe-lh.jpg   2003 LQ4 swap-y-pipe-rh.jpg   2003 LQ4 swap-y-pipe-start-2.jpg  
Old 07-12-2013 | 10:41 AM
  #67  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

y-pipe installed
Attached Thumbnails 2003 LQ4 swap-y-pipe-3.jpg   2003 LQ4 swap-y-pipe-installed.jpg   2003 LQ4 swap-y-pipe-painted.jpg  
Old 07-12-2013 | 10:48 AM
  #68  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

latest underhood pic, I have driven it lately but haven't gotten in the gas too hard as the torque arm is temp installed its running great! so happy I did this swap! the cruise control works well with the DBW, speedometer works no tach though.
Attached Thumbnails 2003 LQ4 swap-underhood-assembled.jpg  
Old 07-13-2013 | 10:01 PM
  #69  
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From: Georgia
Car: 91' Z28. 70' Dune Buggy
Engine: LSX Cam/Full Bolt ons
Transmission: T56
Axle/Gears: 4.10
Re: 2003 LQ4 swap

Great work! Looks like you took your time and did everything right!
Old 07-14-2013 | 05:53 AM
  #70  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Originally Posted by Buggy Disaster
Great work! Looks like you took your time and did everything right!
THANKS!
Old 07-19-2013 | 10:10 PM
  #71  
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Posts: 2,227
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From: Canada,Ont
Car: 1987 TransAm Ttop
Engine: 2005 LQ4
Transmission: Ls1 T56
Axle/Gears: 3:42
Re: 2003 LQ4 swap

did you get the factory tach working yet? what ecm are you running? i have mine working but found how inaccurate it was compared to my autometer.it would also periodically drop to zero at high rpms at wot and then read again when i let off the gas.
Old 07-20-2013 | 05:27 AM
  #72  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

I have not had time to figure out the tach yet out of town working, I think I just wired into the wrong wire in the dash I've been told you need the computer signal changed from 4 cyl output to 8 cyl output though. I am using the factory 2003 2500 Hd truck computer.
Old 07-20-2013 | 01:26 PM
  #73  
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From: Canada,Ont
Car: 1987 TransAm Ttop
Engine: 2005 LQ4
Transmission: Ls1 T56
Axle/Gears: 3:42
Re: 2003 LQ4 swap

Yes it has to be calibrated in the tune for proper tach output.I cant remember the exact numbers you need to set the tach output to but its posted somewhere in the forums.
Old 09-20-2013 | 09:46 PM
  #74  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Stay tuned the next stage of this build is coming when I get home from 86 days of work , unbalanced engineering torque arm install (race version) , Be Cool fans , Holley LS A/C bracket , high output fuel pump (Granatelli), adjustable rear control arms , performance alignment , Loom wire harness , roll bar install for torque arm mounting and safety. Will be busy during Nov/Dec
Old 01-24-2014 | 07:02 PM
  #75  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Roll Bar pics
Attached Thumbnails 2003 LQ4 swap-379658_649582831748630_788570272_n.jpg   2003 LQ4 swap-644338_649582921748621_362278157_n.jpg   2003 LQ4 swap-1390595_649582958415284_1541904366_n.jpg  
Old 01-24-2014 | 07:05 PM
  #76  
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Posts: 181
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Roll bar
Attached Thumbnails 2003 LQ4 swap-1458447_649582858415294_2064660891_n.jpg   2003 LQ4 swap-1459218_649582795081967_345531943_n.jpg   2003 LQ4 swap-1458701_647683255271921_1394261238_n.jpg  
Old 01-24-2014 | 07:12 PM
  #77  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Seat belts
Attached Thumbnails 2003 LQ4 swap-1465242_656786201028293_1329505660_n.jpg  
Old 01-24-2014 | 07:15 PM
  #78  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Unbalanced engineering torque arm install
Attached Thumbnails 2003 LQ4 swap-1441251_656785184361728_1929529947_n.jpg   2003 LQ4 swap-534050_656785011028412_2089777796_n.jpg   2003 LQ4 swap-1472989_656785857694994_1237233138_n.jpg  
Old 01-24-2014 | 07:17 PM
  #79  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

Torque arm mod for improved adjustability
Attached Thumbnails 2003 LQ4 swap-1472054_669805589726354_1285953138_n.jpg   2003 LQ4 swap-1477615_669715806401999_920725627_n.jpg  
Old 01-24-2014 | 07:18 PM
  #80  
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From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: 2003 LQ4 swap

latest engine pict
Attached Thumbnails 2003 LQ4 swap-1482754_670261629680750_2001535057_n.jpg  
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