What are people running? I have an 82' CJ-7 with a 401/TF904?/300. I bought a set of in frame headers, but they look too close to the auto trans..I put in, on the driverside. Any suggestions? Shorty headers, stock manifolds?

When i dumped my 401 in, i used the stock manifolds. these were the same ones on the engine when we yanked it from a J10 w/auto (not sure which auto was used), and there appeared to be plenty of clearance.
I've heard of clearance problems with aftermarket headers, and the solution always seems to be to go with the stock manifolds.

Stock cast manifolds. I'm not turning 6+grand too often. :smokin:

Thanks guys. That what I was leaning toward b/c the edelbrock shortys are high. Anything I should look for when getting manifolds?

Anything I should look for when getting manifolds?
Yes!
Cracks. Particularly the passengerside manifold. Look for a crack between the 4-6 (center) ports. I looked at three sets before i finally got a good one. They tend to crack on the inside where the two ports collect.
The driverside manifolds were all good.

You got larger problems than headers if you have a 904 behind a 401, it won't last long at all.

I prefer headers. You don't have to be running high RPMs to benefit. If you can get them to fit, get something with some smaller primaries and longer tubes. That will help you on the low end torque. The longer the tubes, the better for low end, the smaller the tubes, the better for low end. That being said, if you need block huggers to make them fit, that's OK, just go with 1 5/8 primaries or smaller.

There have been a bunch of threads on AMC v8 exhaust

http://www.pirate4x4.com/forum/showthread.php?t=199658

http://www.pirate4x4.com/forum/showthread.php?t=297977

http://www.pirate4x4.com/forum/showthread.php?t=480474

http://www.pirate4x4.com/forum/showthread.php?t=569698

You got larger problems than headers if you have a 904 behind a 401, it won't last long at all.

Do you say that b/c it's a TF904 or TF999, not exactly sure.. I see you have GM drivetrain. Do you have any suggestions? I want an auto that will work with the 401/300 combo. Well, I am going to try it but have the T-176 still as a backup for just that reason..

Thanks for the links Beat95YJ and info CJim7, bdmonist.

The TF 904 came behind some of the 4 cylinder CJs. It is a light duty trans. The TF 999, much more common, is a medium duty trans that came behind some 4 cylinders and most all 6 cylinders. Not sure about the V8s. Odds would have it that you have a TF999, in which case I would say run it until it breaks. If you run your Jeep hard, it probably won't stand up behind a 401 either. When it breaks I would go with a 727, HD trans, which should hold up fine. If you want to stay with the 401/300 the an AMC trans is your best option due to adapters and drivetrain length. A Chevy could be put in, but I think the 727 is a good tranny and should due fine if you break the 999. Check your VIN on some of the websites that can decipher it for you. IF your Jeep came with a 6 or 8, I would bet you a beer that you have the 999, not the 904. Their casings are very similar, I couldn't tell you the difference between the two.

I believe your right it is a TF999(good thing I didn't bet), came out of an 85' CJ with a I-6. Like you said I am going to run it and see. Let me know if you come across a 727A, I could use a back up plan, automatic. Thanks

any automatic waggy or chief after 1979 came with the tf727 with 23 spline output and bolts up to a d300

Built properly, a 904 will live behind a 401. There are plenty of mopar guys running 904s on the track with bigger power than a 401 makes.

With regards to exhaust headers, I had good luck with a set of Doug Thorley Tri-Ys. They clear the automatics just fine and keep everything inside the frame. Next best thing are the stock manifolds. They actually flow very well, at least better than all the other factory cast iron manifolds out there. The Eddy headers are nice because they fit the stock constrainst perfectly and are meant to replace the manifolds with no other mods to the stock exhaust. I believe they are also emissions legal, hence the high cost.

The Eddy headers are nice because they fit the stock constrainst perfectly and are meant to replace the manifolds with no other mods to the stock exhaust. I believe they are also emissions legal, hence the high cost.

There are emissions and non-emissions models. The non-emissions headers are cheaper.

I just ran into this problem. I am putting a TF-727 behind a 401 that already has full headers. The driver side will not clear. I am not sure which way to go. Back to stock or Edlebrock or Doug Thorley shortys.

I run the out of frame headers ... lots of room :flipoff2:


the amc turbo 400 tranny can handle the 401 hp ..

p.s I have a spare amc turbo 400 tranny sitting here if you need one ...

http://i17.photobucket.com/albums/b89/willysworker/Super%20Delivery/non-emissionmanifoldleft.jpg
http://i17.photobucket.com/albums/b89/willysworker/Super%20Delivery/non-emissionmanifoldright.jpg

I had Thorleys on my 401 w/400 and had plenty of room.

I think I am going to find some stock exhaust manifolds to save on money. What else will I need to run dual exhaust? Should I just take it to an exhaust place and they can take care of the rest.