4.6 thunderbird. easly upgraded? need help.

How much boost do you intend to run? You might get away with a small amount of boost( 2 - 4 PSI ) at that higher compression ratio and octane level of fuel. If you intend to run bigger boost, I would use the NPI heads or build a motor to handle the boost. If it was me, I would build the motor to handle the boost.

I would use the NPI heads as in the non performance improvement heads unless you built the bottom end with forged components and set the compression ratio to the head used.

A 4psi blower would be one with a larger pulley on it than what it would have for 6psi.

One of the problems I run into alot with the MN12s, is in the AODE/4r70ws, the 1-2 shift accumulator piston ends up crooked in the piston bore. Sometimes even, on the 2-3 accumulator, as well. If you ever drop the pan on one, look for the one visible piston and snapring, and pull the snapring out. On just about every trans I've done this on, the spring behind the first piston cover is shattered in 3 pieces, and the piston behind the spring is stuck. You can order the revised pistons on Ebay for cheap.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1,1&item=7930846101&sspagename=STRK%3AMEWA%3AIT"

There is a link to one.

Doing the Jmod is free on these transmissions, granted you have a new solenoid gasket on hand. However, I would recommend getting a complete shift kit, as they come with all new gaskets, springs, check balls, and a manual lever rod. Get a kit, and the updated pistons I linked you to, and fill the trans with Mercon V, and it will shift just incredibly. Not mushy by any sense of the word. I just installed a TransGo kit, and new accumulator pistons on a 95 Cougar with a 4.6, and when you take off like a normal human being, you can't even hear or feel the trans shift. If you romp on it, it will squawk the tires in 2nd every time, and if you manually shift it, you can roast 2nd, and squawk 3rd. In my opiniion, it was the best mod the car had ever received.

I will also reccomend a new torque converter, since the O.E. ones have very weak fins, and tend to slip like crazy after 100k. Even if you get a stock stall replacement, you'd be shocked at the way a new one feels in comparison. Do all of this, get some 4.10s, and say goodbye to traction!
Good luck with your Mn12 hop-up!

Unless you plan on buying the Crower offset retainers, I would look at the Crower and Comp low lift performance cams. A mild cam would be ok, get more aggressive cams then ported heads will be required.

bagged said:

how is the j-mod free? it requires me to mill down the pistions and add another fritction and steel... i belive it said you dont use the pressure plate...which i do not like that idea at all, because this can end up in a bent out plate, over clearence and ....fried clutches...i could be wrong

PI cams, intake, GT tub, MAF from a GT, 3:73s , torque converter and such sound like my ticket!

why not drop the extra cash and go for an after market cams? just a bang for the buck deal? or would a after market came be a lil much?

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The Jmod only requires you to do a little drill work, and possibly have to buy a new separator plate gasket, if yours gets jacked up during the process. Check out the article over at TCCOA.com

t bird guys on tccoa act like there is nothing besides 4.6 or pushrod can be done. good luck

billfisher said:

t bird guys on tccoa act like there is nothing besides 4.6 or pushrod can be done. good luck

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You know what, you wouldn't have got **** put down your throat if you WOULD NOT HAVE POSTED BLATANTLY WRONG INFO.

i had to post something. screw them. i simply posted a motor to consider and dumba$$ t-bird guys(only to include those on tccoa(you know who you are))

some t-bird guy actuallt had to e-mail me, because they get flamed for suggesting anything different. i didn't post crap until you guys forced me to. i though the gt500 and 05 gt weighed the same. besides, you guys are looking to flame any new ideas, not get your tech right. EVEYONE(nearly) that posted on that site got a crapload of things(specs) wrong so i don't really care what narrow monded t-bird guys think. if it ain't you don't take it personal. i even posted stats and it got flamed. i tried fact, fiction, sci-fi, bull$hit, and you guys flamed it. did i throw stuff out there, of course, but so what. after trying to be civil what do you expect?

if you are personally an open minded ford boy, then try something new. have fun, but don't look to flame anything new that peer pressure makes you follow the crowd.