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97 to newer l36 engine/trans swap ??'s

C

cavGTP

New member
Last year I bought a 97' GT with 188k miles for a good deal. Turned out to be a LIM failure. My first thought was to get a newer....about a 99ish motor to drop in it. I know 97 is the off year for the GP so I'm not sure what it would take to put in a newer L36. If I keep the 4t40e tranny, would I be able to use the 97 PCM and harness?....or should I swap to the 4t45e?......maybe the a GTP swap be more logical at that point?

The motor did leak coolant in. I thought about maybe cleaning it up and replacing the gaskets but i'm not sure what kind of damage has been done. Just wanting to get a good starting platform. Any input or advice would be greatly appreciated. Thanks!
 


to use the 4t60e you need the 97 pcm. to use a 4t65e (which you REALLY REALLY should since its no longer vacuum controlled and a lot nicer) you need a 98+ pcm.

the only difference between the 4t65e and the HD version is the differential and axles, IMO not worth it. keep an l36 tranny for the good gearing too. ;)

if you want more power, top swap an l36 block.
 
Since it is a '97 you can find a '97 L67 motor and tranny and just drop it all right in at once :D
 
Ah yeah, I meant the 4t60e and 65 not 4t40 haha

Ok so i definitely need to get rid of the 4t60e. With the 97 L67, would my GT harness work, or would I need to get a GTP harness? I wouldn't need the axles cause the 97 GTP didn't use the hd tranny right?

I'm assuming a 98+ L67 would swap just like the L36 then (harness + PCM), except it needs the GTP axles...and the hd tranny of course. No need to re-pin or re-wire anything, unless I was trying to mod my 97 harness?

Sorry for massive amount of questions in my post, just trying to cover the various options depending on the deal I get with a motor/tranny combo. So, not a good idea to rebuild my current motor? MY buddy knows someone who can hone out the block for cheap.

Thanks for the help guys! :cool:
 
97 GTP used the HD as well. only the 97 GT and SE have the crappy 4t60e.

do a 98+ swap of everything and dont look back (motor, trans, pcm, harness).
 
Ok, well I guess that takes care of it! Here's some pictures of it when I brought it home, oh and one of my 04 Comp G. Got a good deal on the 97...only $350...body is clean!Thanks again for the help.

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grand_prix_gtp.jpg
 


Bio248 said:
to use the 4t60e you need the 97 pcm. to use a 4t65e (which you REALLY REALLY should since its no longer vacuum controlled and a lot nicer) you need a 98+ pcm.

the only difference between the 4t65e and the HD version is the differential and axles, IMO not worth it. keep an l36 tranny for the good gearing too. ;)

if you want more power, top swap an l36 block.
Click to expand...

so u think its better to keep the non HD 4t65e because i was thinking about getting the HD one before i top swaped
 
converting it to HD would be a waste of money imo...

Just put that money towards a built tranny, your going to need one eventually.
 
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