Just built and installed my 426... now I have traction problems...... lets talk

[MadTunes Racing]

Hi guys,

I just completed a 426 build for my jeep. It's a mild setup on the spec sheet but is causing some significant traction issues on the street. It spins all four from a low speed roll and completely fries them from a dig. It seems to do better leaving the traction control on which is the opposite of what I used to do with the little boy cam only setup. When the jeep spins the tires in first it usually short shifts into second and may even throw the p700 code if you leave the traction control off. It has been pretty cool lately and I know it will hook better when the weather is good but I wanted some input from others. This is the first time I've "confused" the tcm by spinning the wheels. I'm sure it would do much better with some drag radials on the rear but I really just wanted to hear what other jeeps with massive torque are doing for traction and how the tcm and transmissions are working with this hp level keeping the drivetrain mostly stock.

On a side note, I'm also debating on either installing blue top solenoids or getting the mopar tcm first. I want to keep the car "stock like" when easing around in it and am a bit worried about excessively harse downshifts with the blue tops.

[yungsrt]

Get the BB stageII valve body instead of the Bluetops.



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[tugboatchad]

I've heard that Paramounts TCM and valve body play nice together on a stock trans and it won't shift until it hits its shift point. Might be worth contacting Bill. His TCM with my D1 Procharger still caused short shifting but it was like at 5900 or better rather than 4000 ish. As for the massive 426 torque you are experiencing I can't comment on that from lack of stroker experience.


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[Cotton Picker]

Congrats on the new 426 ! Now order a SHR transmission and call it a day. Demon has a smoking group buy on them now.




CP

[bcm0018]

If your on a stock trans get blue tops or preferably a BB vavle body. I say the VB cause if you need a new trans he will subtract the initial cost off the new trans. The jeeps tend to short shift into second with lots of tire spin, its pretty common. Also mine roasts the tires on the street as well. If you have a mild build you may not need a TCM. The TCM is used to raise shiftpoints and if you have a mild build you may not need the extra rpm

[MadTunes Racing]

I'll probably eventually upgrade the entire trans but I'm not planning that for a while if I can help it. Doesn't the bb valve body have blue tops in it? I'm probably going to pass on the valve body for now as I'd rather spend that money once if I end up needing the entire trans done. How harsh is the downshift when just easing along and coming to a stop with blue tops installed? Will it tick off a wife?

Thanks for the replys.

Oh and tug: I'm running nitto 420s. What tires are you running and how does it hook in the summer from a dig on the street?

[J&D's SRT's]

Originally Posted by bcm0018

If your on a stock trans get blue tops or preferably a BB vavle body. I say the VB cause if you need a new trans he will subtract the initial cost off the new trans. The jeeps tend to short shift into second with lots of tire spin, its pretty common. Also mine roasts the tires on the street as well. If you have a mild build you may not need a TCM. The TCM is used to raise shiftpoints and if you have a mild build you may not need the extra rpm

First congrats on the new motor & get used to the lack of traction now, hehe.

Second this ^^^ Plus if you ever do decide to get of of the Paramount TCM's in the future everything will play excellent together.

Jim

[MadTunes Racing]

Originally Posted by bcm0018

If your on a stock trans get blue tops or preferably a BB vavle body. I say the VB cause if you need a new trans he will subtract the initial cost off the new trans. The jeeps tend to short shift into second with lots of tire spin, its pretty common. Also mine roasts the tires on the street as well. If you have a mild build you may not need a TCM. The TCM is used to raise shiftpoints and if you have a mild build you may not need the extra rpm

good to know on the valve body credit ... Hmm Any comments on down shifting off throttle, regular driving? with the blue tops installed/ or the vb installed

[tugboatchad]

In the summer I was on a bad OEM 6.1L (torn ring land), I was pissed and needed a relief so I left my buddies Harley shop and went home to get the Jeep to blow off some steam and return to the shop. I laid 100'+ of rubber in the alley on new Crapyear's in about 88* of sunny weather on blacktop, in 2nd gear! Lol!


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[DemonPerformance]

Do you have an LSD btw? Most of the guys that responded to this thread have LSD's in the rear...that also helps with the traction issues...right now if you don't then you're peg legged so that doesn't help you much.