Jatco 3N71B/4N71B (automatic trans) buildup information

KEAS rock, they're building me a drag transmission with transbrake when I got the coin because I'm not good enough to do it myself lol Good for 10s they say, and they're located close to me in Victoria!

Damnit,i buggered up somewhere.2-3 shifts excellent,1-2 shifts firmer but nowhere near as good as 2-3.Anyone done this?Im not sure where i went wrong..

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1-2 shift made 1 hole bigger to 9/64,but it was shit all.I shimmed the pressure regulator .125 and pinned the pressure modifier shut.Also driller a 1/8 hole for the 2-3 shift in the plate and thats about it.Reading the instructions,is there any hole sposed to be drilled in the bodys either side of the separator?I also have to get a turbo modulator before i go ripping it out again…hard to come by,those things.

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Wow,that is ALOT better than what i have..Thanks heaps champ!!Ill let you know how i go.

will a 87 non-turbo automatic modified with this info handle 13 second Na2turbo passes?

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Thanks. Is there a "rebuild kit" somewhere for this thing? So i can rebuild it and do mods at same time.

Sorry for all the questions, I'm on a new project for an auto and you know more about these auto's then i do!

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Modded the valve body again,love where it shifts and how little you have to press the throttle for it to upshift but it slips its ass off,mind you as far as i know it is an original auto..so gonna try tighten up the clutches..If thats a no go,shes getting parked till i get a manual…bugger the auto..lol

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You guys should offer this service to members. Or at least do mine. :lol:

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