Hello, im considering swapping in a pontiac 400 in my firebird but i think the biggest challenge will be putting a 700r4 behind a pontiac engine. I know chevy has their own bellhousing pattern and the BOP is different. Is there any adapters to make this happen?? Couldnt find much info but have heard of it happening. Any help is appreciated. Thanks

not to sound like an *** but y the pontiac 400? id take a sbc 350 over that anyday, better engine all around dont be fooled just cause it has more displacement... sell the 400 buy a 350 and enjoy the bountiful see of aftermarket parts...

o and if you are set on the 400 i believer ive seen said adapters b4 ill look around for ya...

Its cool no harm done. the pontiacs are known for monster torque especially down low, but dont go past 5500 and you will see the inside of it. I just dont want another three speed and a gear vendor is $$$$. And its a nostalgia kind of thing, pontiac car pontiac motor like the good old days. Thanks for checking.

i'm not sure of an adapter for the 700R4, but IIRC the 2004R was made with a sbc & bop bolt pattern. hope this helps

Thank you that is a good lead to follow

Not really..... 400+ CID motors of ANY brand are known for monster torque, compared to little weenie 350 CID ones. Doesn't matter what foundry cast the iron. Fuel makes torque, not cast iron brand. A 400 Pontiac makes the same torque as a 400 or 396 or 402 Chevy, or a 400M Frod, or a 400 Olds, or whatever.

But yeah, you could, in theory, use a motor plate, like people do to put a Powerglide behind absolutely anything. What you'd have to do for a flex plate and some of the other smaller parts, I'm not too sure. Where you'd have the most work to do, would be the exhaust, and the accessories.

The 400 isn't the best choice... if you were going to go to all that work and trouble and expense, don't short yourself. The 455 is EXACTLY the same amount of work and money, but is near 15% more CID, i.e. power; that'd be alot smarter. Spend the same $$$, do the same work, go through the same trouble, but end up with 15% "more" at the end. Much smarter.

http://www.jegs.com/p/JEGS/751074/10002/-1/10531 there is the adapter u need its like 60 bucks....they have one for chevy engine to bop trans, or like u need bop engine to chevy trans... enjoy,,,i still say sbc maybe a 400 chevy

Thanks for the link very nice. And yes actually the 455 is a smarter choice, like 305 or 350 but you work with what you got. And i think stroke has a little something to do with torque- oh and fuel of course.

I put a 700r4 behind an olds 455 last year. Used the Trans Dapt adapter plate. Went together no problems. Also, the mid 80's cutlass had a 700r4 that used a bop bellhousing.

I found a 2004R out of an 86 cutlass with the BOP pattern. Not sure they had 700R4's in them. But hey I guess its possible. I was saving this tranny for the same Pontiac motor swap in my 86 Firebird.

thanks for the info, never would of thought to look in a cutlass! i think pontiac motors are misunderstood and under estimated also thanks

Hi,
check out the new TCI 6X Transmission its a 4L80E 6 speed automatic That bolts right to the pontiac block, no adapters. got mine last summer, they also have a new torque converter called the breakaway, it allows you to daily drive very nicely and do a little street racing, car is awsone on fuel with this set up.
Im using a for 9" rear with 4:11 gears, ladder bar suspension ride tech air ride system, and 32x18x15 mickey thompsons.full roll cage
I have an IAII Block 511 cu in with fast ez efi dual quad fuel injection, Msd 6A Ignition and a bilet distributor,Headman hedders and a 2.5 inch exuast with electric cutouts and borla mufflers, it was dyno tested at houson engine and is kicking out 806hp 600 ft lbs or torque. its one mean street machine,
And just for a heads up....most 455 blocks have thin areas and are not as strong as the 400, you can put a 455 crank in a 400 and even stroke it a tad with rods,
had a few built this way and 6200 to 6500rpm was never a problem if put together right. street and strip raced them quite a bit.

lol they are misunderstood and underestimated on "this" forum but make no mistake Real pontiac engines have a huge following and massive after market parts support these days, check out some of the traditional pontiac and second gen forums for information. These engines are awesome and are what the thirdgen firebird should have been equipped from from the factrory.