[brianteel]

if you have a 3.1 you have to swap out the whole thing. the trans will not work so well with the L67

[bumpin96monte]

Steve Smith said:

I imagine with the low miles on the stock 3.1 I could sell it for a decent price which would help finance this project. Would the best route be to swap the entire engine & trans? I would think the s.c. 3.8 would have a beefier trans than my current 3.1. Heck, swapping out the entire sub-frame for the project is not beyond my capacity as an auto body mech.

Don't count on getting any money out of your 3.1- I tried selling mine w/ the tranny with about 90k on them, and didn't get any offers over about 10 forums. The last week I put it up for free w/ pickup- and no one would even come get it for free. The bad thing is they are a dime a dozen in junkyards, and they are not sought after for any performance part. At least if you had a 3400 or a 3500, then there would be the 3100 people wanting to buy it for parts- but with the 3100, the only thing worth any money might be the intake manis and heads for core's for porting.

The best route is to do the complete powertrain (engine, trans, axle inners). People have a hard enough time keeping the 4t65 on the 3800's together, much less having to work with a 4t60 from the 3100. Just do it once and be done with it, so you don't have to go back and mess with it.

Doing a complete subframe dropout would not be an easy way to go- you're easier off just dropping in the engine/trans. A 95 century should be an A-body still, and with the 3100 in there, the lower 3800 mounts should bolt right in. You'll just need to make upper mounts on the radiator support (assuming your 3100 is a side mount). I just think modifying a w-body or h-body cradle to fit would be a lot more work than needed for the swap. The only way I would do this is if you were crazy about making it a race car, then I would grab a 00+ impala aluminum cradle and swap that in- but like I said- a lot more work that route.

[zeethirtyfo]

step by step instructions? for a 3.4 to l67 swapp anyone?
anyone?

[bumpin96monte]

zeethirtyfo said:

step by step instructions? for a 3.4 to l67 swapp anyone?
anyone?

Look at the thread called "bumpins 3800 faq"

Scroll all the way to the bottom of the main post.

Its not the most complete yet, but I'm working on it....

[zeethirtyfo]

thanks bumpin'

[custommontess]

i was wondering, i just bought a 98 monte Z34 with the 3800. can you just bolt up the supercharger from the L67 or is it harder than that. if any one knows tell me so i can get this done, i need boost

[lav74]

custommontess, on Mar 17 2007, 07:31 PM, said:

i was wondering, i just bought a 98 monte Z34 with the 3800. can you just bolt up the supercharger from the L67 or is it harder than that. if any one knows tell me so i can get this done, i need boost

Well, this isn't a motorswap, it's called a top end swap. You need the entire top end off a L67 engine (LIM, SC and fuel rails, pulleys, balancer)

HeavyChevy3800 did a top end swap. Check out his thread, and search up on it.

[DOHCZ34]

lav74, on Mar 17 2007, 07:07 PM, said:

custommontess, on Mar 17 2007, 07:31 PM, said:

i was wondering, i just bought a 98 monte Z34 with the 3800. can you just bolt up the supercharger from the L67 or is it harder than that. if any one knows tell me so i can get this done, i need boost

Well, this isn't a motorswap, it's called a top end swap. You need the entire top end off a L67 engine (LIM, SC and fuel rails, pulleys, balancer)

HeavyChevy3800 did a top end swap. Check out his thread, and search up on it.

and heads

[lav74]

DOHCZ34, on Mar 17 2007, 08:09 PM, said:

lav74, on Mar 17 2007, 07:07 PM, said:

custommontess, on Mar 17 2007, 07:31 PM, said:

i was wondering, i just bought a 98 monte Z34 with the 3800. can you just bolt up the supercharger from the L67 or is it harder than that. if any one knows tell me so i can get this done, i need boost

Well, this isn't a motorswap, it's called a top end swap. You need the entire top end off a L67 engine (LIM, SC and fuel rails, pulleys, balancer)

HeavyChevy3800 did a top end swap. Check out his thread, and search up on it.

and heads

Thanks Chris. That sounds right.

[custommontess]

thanks, i will buy those parts so i can get it done this weekend

[Greenls07]

So to do the engine swap on my LS 3.1 to 3.8 SC i would have to get a new transmission as well to go with the engine?

[jimbob19]

Greenls07, on Jun 1 2007, 08:15 PM, said:

So to do the engine swap on my LS 3.1 to 3.8 SC i would have to get a new transmission as well to go with the engine?

Ok i have a 95 Ls with 3100 and i just purchased a 97 gtp for 250.00 the only thing i need to no is the wiring. I no i need the harness from a 98 na 3800 but im not sure how to wire it up. I have all the peices to change it to obdii but i dont no what wires to switch on the c100 connector at the firewall and cant find a diagram for it. Is that all i should need?

[Burke]

Hi, I'm a new kid on your block. I've been turning wrenchs for almost 40 years. I know alot about the old school hp tricks but next to nothing about computer cars. I've been reading all the stuff from your site and have a pretty good uderstanding on what I have to do to swap my 98 Lumina LTZ 3800 2nd ser. with a s/c 3800 1 ser. from an 94 Buick Park Ave Ultra. The question is, since the s/c engine has to be torn down do to a rod knock, do I just swap the top part, heads on up or the complete engine? I do realize that the 2nd ser. block is alittle lower in hieght, so are the angles going to allow me to mix the parts in the first place?

[me6894]

Burke, on 28 March 2010 - 11:03 AM, said:

Hi, I'm a new kid on your block. I've been turning wrenchs for almost 40 years. I know alot about the old school hp tricks but next to nothing about computer cars. I've been reading all the stuff from your site and have a pretty good uderstanding on what I have to do to swap my 98 Lumina LTZ 3800 2nd ser. with a s/c 3800 1 ser. from an 94 Buick Park Ave Ultra. The question is, since the s/c engine has to be torn down do to a rod knock, do I just swap the top part, heads on up or the complete engine? I do realize that the 2nd ser. block is alittle lower in hieght, so are the angles going to allow me to mix the parts in the first place?

You don't want a series 1 you want a series 2. The series 1 had the M62 and didn't make anymore horsepower than the series 2 3800 n/a that is already in your car.

Look for an L67 out of a 98 or newer gtp, regal gs, etc. Or you can get an L32 out of an 04+ grand prix that will drop in basically the same as an L67 but will have the more efficient gen 5 blower.

[Burke]

Thank you for your input. Is there anything worth keeping from the 94 3800 s/c car?

[me6894]

Burke, on 29 March 2010 - 06:40 PM, said:

Thank you for your input. Is there anything worth keeping from the 94 3800 s/c car?

Not really. Pretty much everyone is different for a series 2

[Burke]

What about the tranny? Could that be used with the 2nd ser. or newer 3800?

I'm trying to post some pic's, but I keep getting a error message. I guess I'll try another ave.

This post has been edited by Burke: 30 March 2010 - 11:18 AM

[me6894]

Burke, on 30 March 2010 - 12:13 PM, said:

What about the tranny? Could that be used with the 2nd ser. or newer 3800?

I'm trying to post some pic's, but I keep getting a error message. I guess I'll try another ave.

No.

I don't know why you would want a 16 year old tranny anyways.

[ChibiBlackSheep]

me6894, on 30 March 2010 - 12:31 PM, said:

I don't know why you would want a 16 year old tranny anyways.

Yeah, you gotta wait 2 more years before he/she is legal.

[Nick07]

ChibiBlackSheep, on 30 March 2010 - 12:57 PM, said:

me6894, on 30 March 2010 - 12:31 PM, said:

I don't know why you would want a 16 year old tranny anyways.

Yeah, you gotta wait 2 more years before he/she is legal.

That wasn't the next thing I was expecting to read. I lol'd for sure

[Dyonysis]

ChibiBlackSheep, on 30 March 2010 - 09:57 AM, said:

me6894, on 30 March 2010 - 12:31 PM, said:

I don't know why you would want a 16 year old tranny anyways.

Yeah, you gotta wait 2 more years before he/she is legal.

Freakin' Awesome!

I am immensely disappoint that my normally sick/ Family Guy influenced mind did not see that.

[LaneLander]

ChibiBlackSheep, on 30 March 2010 - 11:57 AM, said:

me6894, on 30 March 2010 - 12:31 PM, said:

I don't know why you would want a 16 year old tranny anyways.

Yeah, you gotta wait 2 more years before he/she is legal.

OH my now that is the funniest thing I have read all day.

[xjugstarx]

i have a 99 monte carlo ls that has a little over 240,000 miles on it and the transmisson just started to slip i plugged my scan tool in and it was giving me a P1870 code which i looked up on all data at my school which it turned out to be a TCC solenoid check so to make a long story short i want to swap my 3.1 for the L67. After reading this it seems that i dont need any mods. It hasnt been lowered its bone stock except for intake and programmer, which i think is why the transmission started to slip. So if you could help me out with what mods i need or any useful info i would greatly appreciate it.