timdjohn Posted April 3, 2006 Report Posted April 3, 2006 I have basicly decided to swap out my 3.1L to a 3.4L that I shall rebuild. it is going into a 1992 GP BTW. So i plan to look for a 91-95 3.4L , I am wondering what all I shall need outside of the engine it'self? Shall I have to get a new wireing harness? I am sure I shall need a new computer, but I read somewhere that I have to have a new cradle as well. is that true? I hope not. I am guessing I also shall have to get the electronic 4 speed automatic as well. Quote
19Cutlass94 Posted April 3, 2006 Report Posted April 3, 2006 3.1 to 3.4DOHC??? Should bolt right in. Youll need a wiring harness though what tranny do you have? Quote
timdjohn Posted April 3, 2006 Author Report Posted April 3, 2006 3.1 to 3.4DOHC??? Should bolt right in. Youll need a wiring harness though what tranny do you have? Yes the DOHC 3.4L I have the 4T60 tranny, I figured I would have to use the 4t60-E and a new computer to match Quote
timdjohn Posted April 3, 2006 Author Report Posted April 3, 2006 search I have searched, it brings up so much unrelated info you give up. That is why I kindly ased. It gets so tiring on msg forums when those in the know get smug and just post onlinrs that say search. So very constructive Quote
fastbird232 Posted April 4, 2006 Report Posted April 4, 2006 Well, the worst thing you can do is complain about it, because then people will just start jumping on you about that. Just say, "I did search..." and wait for someone to offer something constructive. If you're going to put in a 3.4, why not a '96-'97 with the 5 extra hp? Quote
timdjohn Posted April 4, 2006 Author Report Posted April 4, 2006 If you're going to put in a 3.4, why not a '96-'97 with the 5 extra hp? Well I was going to look for the 96-97 engine, but I had just been looking on I belive 60degreev6.com that there are several changes to the 96-97 such as exhuast and wiring. I was sort of looking for a farly factory installed look and ease of install. so if I had to modify exhaust and cut into the wiring harness I may as well go full throttle with an L67. But i could easily be wrong. It also depends on what all I can find out there locally for a sutable engine. if I find a 96 cheap I may just take that. Quote
Psych0matt Posted April 4, 2006 Report Posted April 4, 2006 there shouldnt be much more to a 96-97 other than the harness, and the exhaust should bolt right up (as long as the pre 96 dohc and 3100's have the same exhaust) I just put a 96 in mine ('94) and it bolted right up Quote
patgizz Posted April 4, 2006 Report Posted April 4, 2006 i just did some searching, unfortunately it looks like any writeups i ever did on the swap were lost when the forum changed over because they were there before the new software. and since 60v6 is on a new server and i did the swap write up back in the gmforums days, that's gone too. oh well. Quote
timdjohn Posted April 5, 2006 Author Report Posted April 5, 2006 there shouldnt be much more to a 96-97 other than the harness, and the exhaust should bolt right up (as long as the pre 96 dohc and 3100's have the same exhaust) I just put a 96 in mine ('94) and it bolted right up Oh so you just put a 96 3.4L in your 94? hm well I guess all the issues I had read out there must have been wrong if you didnt have to do any mods. BTW I was going to try and use no matter what year engine I get, the 1992 PCM for a 3.4L. So if I did this i should still be able to use a 1992 wire harness, so I am thinking. But once again all my planning could go wrong once I get into the swap. Quote
GP1138 Posted April 5, 2006 Report Posted April 5, 2006 unfortunately it looks like any writeups i ever did on the swap were lost when the forum changed over because they were there before the new software. oh well. No. If you look back, all of the technical forums are archived from 2002 when this forum was starting. Try using different search terms. To wit: http://www.w-body.com/forum/index.php/topic,2877.msg24172.html#msg24172 take everything you can see out of the engine compartment that has to do with engine, trans, mounting of them, cooling system(all lines both radiator and heater), air conditioning system, wiring(the plug unscrews at the firewall on the pass. side). take the engine harness, computer, and whatever is attached to them(the fuse blocks in the engine compartment) oh ya, take the alternator cooling tube and blower motor and its associated wiring from under the right fender I came across this by going to your profile and looking from the beginning at all the posts you've made from '02 on. Quote
patgizz Posted April 5, 2006 Report Posted April 5, 2006 funny. i put in my name and "dohc swap" in the search and came up emptyhanded, whereas before the new software all the old posts popped up. Quote
Psych0matt Posted April 6, 2006 Report Posted April 6, 2006 I would give you all the links to the threads I had bookmarked, but since the new setup, none work :-( Yes, there are a few sensors, and a few things youneed to know, but I don't know without looking what those are, and what applies to your swap as opposed to a 3.4 to 3.4 EDIT: Try these, the first one has some very helpful info about halfway down, and feel free to im or pm me if you actually do this, its fresh in my mind http://www.w-body.com/forum/index.php/topic,39034.0.html http://www.w-body.com/forum/index.php/topic,39487.0.html Quote
timdjohn Posted April 6, 2006 Author Report Posted April 6, 2006 I would give you all the links to the threads I had bookmarked, but since the new setup, none work :-( Yes, there are a few sensors, and a few things youneed to know, but I don't know without looking what those are, and what applies to your swap as opposed to a 3.4 to 3.4 EDIT: Try these, the first one has some very helpful info about halfway down, and feel free to im or pm me if you actually do this, its fresh in my mind http://www.w-body.com/forum/index.php/topic,39034.0.html http://www.w-body.com/forum/index.php/topic,39487.0.html Thanks, these links do help a great deal. at lest it gives me some direction. I tried to do a search also but can not really find anything older then 2002 which is I guess where all the good post for this swap were. [br]Posted on: April 06, 2006, 07:31:21 PM_________________________________________________ Oh on other thing, I had read the post you did while you were putting in the 94 intakes on your 96 engine. But I did not find out what the results were. So do you feel the older intake gives you the low end and the 96 engine gives you the higher output that you were hopeing for? Quote
JakeMetz63 Posted April 7, 2006 Report Posted April 7, 2006 97 3.4 to 94 GTP was an easy swap. Need a doughnut gasket for the exhaust and need to weld the EGR. The air system wont be working, so patch those up too. I had to use my 94 intakes because I didnt have the throttle body on the 97. Quote
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