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.

91 LS Swap

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Old Dec 1, 2017 | 02:37 PM
  #1  
Inkaddict54's Avatar
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From: Oakland Park
Transmission: 4l60e
91 LS Swap

alright guys I new to this. Looked all over the forms . Trying to figure out exactly what I need to do to stuff an truck ls into it. So far I have the 4.8 that I wanna turbo but also want to add a/c. I bought all the brackets from Ict . I’m trying to figure out what else to get .

The parts i have 4.8 ls from 01-03 1500 with a 4l60e
spoon cross member
Ict brackets
Walbro 450 fuel pump
dirty dingo mounts.

Any information will be helpful.
I’m only running the 4l60e till I build a 4l80e
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Old Dec 1, 2017 | 02:55 PM
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From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: 91 LS Swap

Everything is already covered in the stickies in the LXT LSX sub forum
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Old Dec 1, 2017 | 03:04 PM
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Car: 86 Sport Coupe
Engine: 5.3 LM7
Transmission: T56
Axle/Gears: 4th gen 3.42 posi
Re: 91 LS Swap

I put a video up a few weeks ago on what i did for my swap. I covered pretty much everything as far as options go for A/C and exhaust. You’ll want to get an f body oil pan to replace the truck pan, as it will hang below the k member. You’ll also need to replace the truck intake with one from a car. Ls6 intake would be the best bang for your buck. The stock 4.8 truck intake won’t clear the factory hood.


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Old Dec 1, 2017 | 03:08 PM
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From: Oakland Park
Transmission: 4l60e
Re: 91 LS Swap

Thank you ! I have a 4.8 with a 4l60e and wire harness from the truck and cluster. I herd that you have to tap the block for the water pump ?
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Old Dec 1, 2017 | 03:15 PM
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From: New York
Car: 86 Sport Coupe
Engine: 5.3 LM7
Transmission: T56
Axle/Gears: 4th gen 3.42 posi
Re: 91 LS Swap

Originally Posted by Inkaddict54
Thank you ! I have a 4.8 with a 4l60e and wire harness from the truck and cluster. I herd that you have to tap the block for the water pump ?
Don’t see why you would need to. Your just running the pump that came on the motor, no need to modify.
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Old Dec 1, 2017 | 03:21 PM
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From: Oakland Park
Transmission: 4l60e
Re: 91 LS Swap

A lot of people on the forums said need to put the ls 5.7 water pump for a 98 - 02 Camaro ss. I just wanna make sure I buy all the right parts to get it ready to turbo it . Doing that March.
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Old Dec 1, 2017 | 03:49 PM
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Car: 86 Sport Coupe
Engine: 5.3 LM7
Transmission: T56
Axle/Gears: 4th gen 3.42 posi
Re: 91 LS Swap

Originally Posted by Inkaddict54
A lot of people on the forums said need to put the ls 5.7 water pump for a 98 - 02 Camaro ss. I just wanna make sure I buy all the right parts to get it ready to turbo it . Doing that March.
Yea you’ll need ls f body accessories as Im pretty sure the truck alternator won’t clear the hood. If you go with an f body 5.7 water pump, you’ll need all f body acessories. The spacing is different between the car and truck accessory drives. I’m pretty sure you need to drill and tap the block for the ls alternator bracket. My Lm7 5.3 did’t have the hole drilled, but the space is there. As for the water pump, it just bolts right up. No drilling or tapping required.
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Old Dec 1, 2017 | 03:59 PM
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From: Monroe, Michigan
Car: 1991 Camaro RS
Engine: 4.8l LS
Transmission: TH350
Axle/Gears: 3.23
Re: 91 LS Swap

There is a few different options. Take a look in the power adder section for my thread, I have my 4.8/4l60e in already.


You will need an Fbody Pan, pick up tube, windage tray, dipstick, and dipstick tube. Along with this you should also purchase an ls1 intake and fuel rail along with an fbody water pump. You can purchase spacers to use the fbody water pump with the truck accessories.


I purchased ITC brackets that move the alternator to the left, along with moving the power steering pump. Everything has worked great. The kit also included the spacers for the water pump as well.
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Old Dec 1, 2017 | 07:30 PM
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From: Oakland Park
Transmission: 4l60e
Re: 91 LS Swap

Is it on your website ?
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Old Jan 15, 2018 | 05:33 AM
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Re: 91 LS Swap

I bought a 5.3L truck engine and used an LS1 oil pan and a slightly modified LS1 accessory drive set-up. I chronicled that challenge here:
https://www.thirdgen.org/forums/ltx-...ory-drive.html
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