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2007 cadillac sts
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Discussion Starter #1
I have a v6 but want to swap out for a 4.6 north star will I halso have to change out transmission? Or would the existing v6 tranny be fine with the v8???
 

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08 STS-4 N* 1SG, 08 DTS Luxury II, 04 Bonneville GXP N*
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I'm not sure that you really appreciate how much work is required to make this change. This is definitely not a change even worth considering.
 

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2006 STS4 V8 1SG & 2007 STS V8 1SE
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It's said anything can be done, but I 'm with the crowd. I can't recall a member with a running parts-car to provide donations. I think it would take that and a lot of work, know-how & probably access to the GM Service Network.

But... If you do it,

Post Often!
 
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Anything can be done with enough money and the right skills but WHY when there are better and less costly alternatives.
 

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2006 STS4 V8 1SG & 2007 STS V8 1SE
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Koz - That can be prevented by not pressing too hard on that long thin pedal on the right.

On second thought, you're right. :)
 

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06 STS-V & 06 STS 4 (sold 2016)
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It's impossible even without beer. Just takes one fool who thinks he'll pass you in the right lane of the on ramp in his Toyota.
 

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05 STS4
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dkozloski said:
Interesting all right; if you like broken drive line parts.
Actually short of the better brakes and 6 lug wheels a FULL engine swap into a 07+ v8 STS sport (so it has the LSD rear) has the same rear end axles and I'm 90% sure transmission so "mechanically" it should tolerate it (assuming rwd without factoring the t case and front axle). As for suspension awd got the same SIZE rear bar (but supposedly not as stiff) and both front and rear bars can be swapped to any model STS. Springs again can be swapped. Shocks personally I think the magnetic ride would prove better than the Sachs shocks used on the V.

The LC3 sc CAN bolt to the LH2 northstar without issue. Run a larger pulley to lower the boost and I THINK the LH2 could handle it. No idea how long though. The V used larger walls hence the 4.4 vs 4.6 displacement difference as well as being hand build using forged components.

Personally I thought about it but it's just not worth it. I have my Camaro for speed and the LH2 with awd is fast "enough" (note more power is alway great within financial reasoning IE cost to power ratio) to easily handle most need for speed moments.
 

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08 STS4 V8 1SG & 04 SRX4 V8 & 01 Monte SS
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4,988 Posts
The V does have a slightly different transmission compared to the 6spd used in 07+ V8 / 08+ V6/8
 

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05 STS4
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Ludacrisvp said:
The V does have a slightly different transmission compared to the 6spd used in 07+ V8 / 08+ V6/8
V6 trans is completely different model from the v8. I believe the v and v8 rwd trans from 07+ was the same.

Edit.

While I was correct about the v6 and v8 being completely different it does appear the v and v8 trans are different as well. I would assume beefer internals and perhaps better cooling/ratios as opposed to the standard v8 rwd trans.
 

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08 STS4 V8 1SG & 04 SRX4 V8 & 01 Monte SS
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V6 trans is completely different model from the v8. I believe the v and v8 rwd trans from 07+ was the same.
Edit.
While I was correct about the v6 and v8 being completely different it does appear the v and v8 trans are different as well. I would assume beefer internals and perhaps better cooling/ratios as opposed to the standard v8 rwd trans.
Might you be referencing my thread?
http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2012/264180-transmission-differences-6l50-6l80-6l90-internal.html
 
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