• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Transmission Swap Fittment (Regal to GP)

indygrandprix

indygrandprix

New member
Bought a transmission from a 98 Buick Regal GS and am going to put it in my 01 GT. I already read up on the issues with the fittings for the tranny lines needing to be switched. Not a big deal. My bigger concern was that the casting on the tranny's bellhousing from the Regal says 910 and the one on my GT says 901 and then the one in My GTP says 911. I just want to make sure everything will bolt up before I tear into my GT.

Other questions I also had...

Is the 4th shaft hardened in the HD tranny before 03?

Anything I should replace besides the axle seals and input shaft seal before putting it in?

Will the regal torque converter work in the GT?
 


I'm not 100% as to why, but the interchange from car-part.com is showing 97-98 GTP and GS only work in those cars. I think there were some subtle differences but am not sure. Regardless, the torque convertor for the Regal won't bolt to a L36 flexplate, so you'll need to use the one from the GT trans. Also, the gear ratios are going to be wrong so you'll need to change the trans settings in the PCM so that works right. And, you need the P/S axle for the HD differential.
 
I know about reprogramming for the Gear Ratio change. I'm gonna have dsmuts do that for me after I get it changed over.

If I have the flex plate from the L67 engine will that bolt to the L36 crank so I can use the Regal torque converter?
 
I would change the filter and clean out the pan now.As far as I know only the line hook ups may be different.See if the boxes on the trans are the same.The 4th is supposed to be hardened in 03 up.I had an 03 trans rebuilt and the splines had some wear still.I am not sure if I have an early 03 or what but I replaced it.
 
indygrandprix said:
I know about reprogramming for the Gear Ratio change. I'm gonna have dsmuts do that for me after I get it changed over.

If I have the flex plate from the L67 engine will that bolt to the L36 crank so I can use the Regal torque converter?
Click to expand...

If you have the L67 flexplate then you can run the L67 torque convertor.
 
Actually yes an l67 tq converter WILL bolt to an l36 flexplate. Its the l67 flexplate that wont bolt to an l36 tq converter. L36 flexplates have dual bolt patterns, l67s have one. Only issues youll run into is the tranny lines and dif gear ratio. Also your car will be a lil slower. You grabbed the matching pass cv axle too right?
 


seems like you got it all covered, the only other thing that you may have to do is the PNP swap, if your 03 has an internal shift deal.

the 98 regal trans has that black box by the shift lever its external. theres a how too here if you need it.
 
On all the l36s i dropped trannies on they were, there was actually a debate on a gtp fb page that saved my butt. They were having the reverse debate. Im planning on bolting an l67 to an l36 trans pulled my flywheel and it was single pattern. I grabbed flexplate off an 01 monte ss, dual pattern
 


PLEASE do not swap flex plates to fit the torque converter... If the bolt holes do not line up use a grinder to make them bigger or smaller.
 
I'll have to see if it's dual pattern when I tear into it. I was gonna do a build thread on how to Put a HD trans in a GT car. I know its not much different from R&R of any 4t65e trans but I figured i might as well.

As far as the axle I was just going to get a new one from NAPA and tell them I need it for an 01 GTP. That will get me the correct length axle right? I replaced the Driver Side one about 10k ago fortunately I hadn't replaced the pass one yet.
 


Scottydoggs said:
seems like you got it all covered, the only other thing that you may have to do is the PNP swap, if your 03 has an internal shift deal.

the 98 regal trans has that black box by the shift lever its external. theres a how too here if you need it.
Click to expand...

I haven't read anything about a PNP switch swap. My car i'm putting the 98 tranny in is an 01 tho so I shouldn't have to right? It's just 03+ that had internal PNP switches?
 
98 has this box by the shiftier lever.

if the tranny in your car has this box its a direct swap. if not you need to follow this how to.

http://www.grandprixforums.net/thre...witch-to-a-transmission?p=1090321#post1090321

IMG_4698.jpg
 
You must log in or register to reply here.
Back
Top