LS Motor

[jeepmanjeff]

Looking at doing a LS2 (6.0 truck ou of a 2007 Silverado). motor install in the Jeegy

I found one on eBay with 177k on it and it is a drop out complete with the system turn key for 3 wire hook. It comes with a 30 day warranty after the install date.

It was $2030 to my door with no core charge

Any concerns here? What about VSS. Anyone using a GPS module?

Also I would like block hugger manifolds with a center drop. Don’t know where to spice these at

Not a LS guy so any help would be appreciated.


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[WrenchMonkey]

Do you know the weight difference off the top of your head, iron block vs aluminum. I'm not sure how much I'd pay per kind of weight savings, but it would be something...

[93 Krawler]

Originally Posted by WrenchMonkey

Do you know the weight difference off the top of your head, iron block vs aluminum. I'm not sure how much I'd pay per kind of weight savings, but it would be something...

Bout 70lbs

Scoggins-****ey catalog ppg181

LS Block reference Block only-

LS1/LS6 - Aluminum - 110#

LQ9/6.0L - Cast Iron - 170#

LS2 - Aluminum - 110#

LS3/L92 - Aluminum - 110#

LS7 - Aluminum - 110#

C5R - Aluminum - 120#

LSX - Cast Iron - 225#

LSX Tall Deck Cast Iron - 250#

[JeffK5]

Around 70 lbs and 70hp difference between a LS2 and a LQ4.

[jeepmanjeff]

All great information!

Will do some more research tomorrow


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[93 Krawler]

FYI, anything out of an Envoy or Trail Blazer will have a front sump.

[93 Krawler]

Sure

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[93 Krawler]

We were talking about transmissions at Windrock. The gearing drop on your 2nd to 3rd is crazy. You need a gear between them. 2nd is too high and 3rd is too low. That's why launching is hard to do. Food for thought...

SM465 - Case length - 12"
First - 6.55:1
Second - 3.58:1
Third - 1.70:1
Fourth - 1.00:1
Reverse - 6.09:1

TH350 - Case length - 21 3/4"
1st - 2.52 : 1
2nd - 1.52 : 1
3rd - 1.00 : 1
Reverse - 2.07 : 1

TH400 - Case length - 24 3/8"
1st - 2.48 : 1
2nd - 1.48 : 1
3rd - 1.00 : 1
R - 2.07 : 1

[blazerbrad]

Originally Posted by 93 Krawler

We were talking about transmissions at Windrock. The gearing drop on your 2nd to 3rd is crazy. You need a gear between them. 2nd is too high and 3rd is too low. That's why launching is hard to do. Food for thought...

SM465 - Case length - 12"
First - 6.55:1
Second - 3.58:1
Third - 1.70:1
Fourth - 1.00:1
Reverse - 6.09:1

TH350 - Case length - 21 3/4"
1st - 2.52 : 1
2nd - 1.52 : 1
3rd - 1.00 : 1
Reverse - 2.07 : 1

TH400 - Case length - 24 3/8"
1st - 2.48 : 1
2nd - 1.48 : 1
3rd - 1.00 : 1
R - 2.07 : 1

Keep in mind that it's not really apples to apples when looking at the ratios between an auto and manual transmission. You need to factor in the torque converter ratio. In general you typically at least double the ratio, meaning that the TH350 or TH400 is closer to a 5:1 ratio. The way I always explain it is you get a much broader range of ratios (i.e. wheel speed) from just one gear in the transmission because of how the torque converter varies.....from a start/launch you get the 5:1 crawling ability but can then seamlessly get a the wheel speed of the 2.5:1 gearing with no shifting at all. Of course on top of that the auto can even upshift into a higher gear in a middle of an obstacle without losing all of your momentum and engine rpm.

[93 Krawler]

Originally Posted by Waffle

What xcase are we talking about? What ratio? It's ratio and the diff ratio will be a huge factor for making a 350/400 work.

The rest of the drivetrain has nothing to do with comparing Transmissions ratios. They are what they are.

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[93 Krawler]

He has an atlas 2 - 3.0 gear ratio. Not sure of his axle gearing

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[Smiddy24]

Originally Posted by 93 krawler

he has an atlas 2 - 3.0 gear ratio. Not sure of his axle gearing

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