Well my shop is ready to install my BRAND NEW LS engine. However, the bolt pattern on my turbo-400 transmission does not match the engine. The LS engine bolt pattern is designed for a chevy turbo-400 transmission..ugh!!! Come to find out olds,pontiac and buick have a different bolt pattern compared to the chevy turbo-400..So they are saying i need a BELL HOUSING ADAPTER for my transmission to make this work.They are having a hard time finding an adapter...So does anyone here know where i can find this adapter???

 

Summit, Jegs, or most any other performance suppler.
JEGS 60170: Engine to Trans Adapter Plate Chevy Engine to B.O.P. Trans - JEGS High Performance

 

Thank you!! That appears to be the correct one...

 

You would think my shop could have found this??? But it was also closing time when they let me know about this...

 

I can't believe I am helping this swap but get something stronger like the Transdapt adapter. I had that flimsy one on my 8.5 to 1 307 headed Olds 350 connected to a 4L60E. I could only fit 4 of the 6 bolts on the cheap one like that. This one is notched and has the reduced head bolts.
https://www.summitracing.com/parts/trd-0060

 

I was just looking at this one before i read your response...Thank you!!!

 

If you are going through all of that why not put in the matching 4L80E trans. See how easy I spend your money. Truthfully if the BOP 400 isnt fresh you will likely be replacing it shortly. Why not do it now. Plus you get overdrive.

 

I was going to do that next year, but it is a thought???

 

Hell yes. Do it now. You have committed this far. Do it right. You are shooting for a modern drivetrain car. Do it. Bank is obviously no issue. I would step up while you are there anyway. You will love it that much more.