Author Topic: LS3 motor and 6speed manual trans  (Read 190 times)

737driver

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LS3 motor and 6speed manual trans
« on: August 06, 2019, 10:45:42 PM »
So I have been looking around at different LS options for my 77TransAm project. I have seen a lot of LS3 engine and transmission combos from 2010 and up camaros. Outside accessory brackets and oil pans, Do anyone have info on the fitment of these motors? I have been also looking for other LS options as well. I have also looked at the LS connect and cruise option from Chevy Performance as well. Really looking for any thoughts or ides people might have on it.
Thanks,
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

scarebird

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Re: LS3 motor and 6speed manual trans
« Reply #1 on: August 06, 2019, 11:35:19 PM »
Radiator is one issue, water pump outlet another...

737driver

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Re: LS3 motor and 6speed manual trans
« Reply #2 on: August 07, 2019, 11:45:29 AM »
What issues would they create? I thought that if I use an LS Radiator it should work, are there any other issues with the water pump?
thx,
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

scarebird

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Re: LS3 motor and 6speed manual trans
« Reply #3 on: August 07, 2019, 01:57:53 PM »
What issues would they create? I thought that if I use an LS Radiator it should work, are there any other issues with the water pump?
thx,
Jim

I used a 98-02 F radiator in mine for hose routing - the upper hose needed to be shortened as the water pump outlet moved in LS3's. 

Outlets need modding with fittings - If I used the Holley pan like I should It will be even lower in the frame.






I would not screw around with frame cutting for the AC, use the aftermarket mount kit

skisix38off

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Re: LS3 motor and 6speed manual trans
« Reply #4 on: August 07, 2019, 02:00:40 PM »
This has been done many times.  At an overall view, there are several places that make all the parts you need to do the conversion.  I just finished my own and there is a thread on this a few down.  Motor mounts, Fuel system, Cooling system and how to feed info to the gages are the big categories.  If you are going to have someone do this for you ( I highly recommend this option unless you are unusally handy in the garage) then you will need to provide input on how you want to do it or, how they have experience doing it.

I'm loving mine!

Re: LS3 motor and 6speed manual trans
« Reply #4 on: August 07, 2019, 02:00:40 PM »

737driver

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Re: LS3 motor and 6speed manual trans
« Reply #5 on: August 07, 2019, 02:04:00 PM »
That is real good info! I plan on using the high mount brackets for the accessories and not notching the subframe. I think I found a decent LQ9 block that I am going to take a look at.
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

737driver

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Re: LS3 motor and 6speed manual trans
« Reply #6 on: August 07, 2019, 02:07:00 PM »
I plan on doing it myself , I have the shop and tools to do it. Just trying to figure out the best options and plans on going about it.
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

FormTA

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Re: LS3 motor and 6speed manual trans
« Reply #7 on: August 07, 2019, 04:56:54 PM »
I used dirty dingo engine brackets and I didn't set the engine back far so the stock 98 ls alternator fit and I didn't need to use angle fittings on the water pump. It also let's you install the transmission crossmember in the back hole of the frame and you don't need a special crossmember or cut and weld the tang.
79 Trans am 301 (work in progress) LS swap n progress
79 Formula 301 (Work in progress)
67 RS Camaro (Work in progress)
See the recurring theme???

skisix38off

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Re: LS3 motor and 6speed manual trans
« Reply #8 on: August 08, 2019, 07:14:51 AM »
I plan on doing it myself , I have the shop and tools to do it. Just trying to figure out the best options and plans on going about it.
Jim

I had really good luck with Matts classic Bowties, I bought a Holley EFI controller and the harness.  And I used the MuscleRodz engine mount and crossmember, I also bought their gas tank with in tank pump and radiator.

Re: LS3 motor and 6speed manual trans
« Reply #8 on: August 08, 2019, 07:14:51 AM »
You can help support TAC!