Northstar GTP??

[CapnBreakAlot]

Yeah I'm not trying to have the fastest GP out there.. Just something unique. How much are LS4's going for? and I still have that 99 eldorado so could I pull the trans out of that? It would probably need rebuilt though. It slips into 2nd and 3rd with any decent amount of throttle. I might just go buy a trans.. less work lol.

 

[Nighthwk12]

Wouldn't need a different trans for the LS4. It bolts up to a 4t65e

 

[CapnBreakAlot]

Thats right.. they use the 4t65e HD in the GXP don't they? Is the gearing any different in those than my GTP?

 

[blueguy]

Nope.

 

[CapnBreakAlot]

Nope.

Nope to what? I asked two questions there lol. I'm assuming nope to the gearing? Therefore meaning that the gearing is the same and I should have no trouble bolting an LS4 up to my GTP trans?

 

[Scottydoggs]

that engine and trans will never mate up.:th_coocoo:

 

[CapnBreakAlot]

Why not?

 

[Scottydoggs]

bell housings are different, you would need to find a tranny that would bolt up to a ls4.

my brothers got a olds aurora, its got a N* in it and a auto fwd trans. hit the perf shift button and it chirps second gear, bone stock. not sure what tranny its got, i do know its not what a gtp or regal uses.

 

[CapnBreakAlot]

4T80E probably.. I believe thats what they put in the N* cars. I'll have to look into seeing if a 4T80E will bolt up to an LS4

 

[Scottydoggs]

heres the tranny it uses.


The Northstare engine and 4T80-E had been exclusive to Cadillac prior to the Aurora.

 

[CapnBreakAlot]

I have a 99 Eldorado that pretty much done so I could possibly pull the trans out of that. Like I said earlier though it probably needs rebuilt.. That is of course if that'll bolt up to an LS4

 

[Nighthwk12]

that engine and trans will never mate up.:th_coocoo:

The cases are different from a ls4 and 3800?

 

[Scottydoggs]

ls4 should fit our trannys, same thing as the gxp.

the northstar wont. i thought he was still on the northstar.

 

[CapnBreakAlot]

Ohh jeez. You had me all confused there for a second.. So the LS4 will bolt right up to my GTP trans?

 

[Scottydoggs]

the bell housing should. my guess would be you need to use a v8 flex plate. then hope it uses the same holes for the torque converter. so you dont need to buy one of them.

 

[87IROCZOWNER69]

Come to Nebraska....the junkyard by me has a t-boned Bonneville GXP with about 80K on it. The yard only charges $300-400 for a full motor IIRC.

 

[camopaint0707]

why not an LNF ecotec while we are at it.

 

[orange57]

Few N* haters in here. They made some updates to the engine for 2000+ FWD, and revamped it for RWD in 04. The RWD is a solid motor, have it in my 05 STand love it. Just an fyi, the bell housing bolt pattern is unique to the motor, and as others have said it is expensive to repair when something goes. The bottom end is pretty stout, but the top end was questionable on the fwd. Oh, and the split case design is prone to oil leaks.

 

[Nighthwk12]

^Fact^