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Old 06-17-2006, 07:40 PM
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How to control my 4L6OE in 99 Tahoe?

Hello to all,My eye's are killing me from reading all postings on Trans & rear ends ,great fact findings,but its my turn.The super Chevy store in Brooksville,Fl has built me a 350 SB bored to 60 over & largest aluminum heads & all matched.He started out with fuel injection but ended up with a Edlebrock 750 carburetor.The problem he is going to have is the 4L6OE transmission in my 99 Tahoe LT.I'm taking all replies to him on Monday,Please ,alot of help from everyone will be much obliged .

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Old 06-17-2006, 07:45 PM
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What's the question?
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Old 06-17-2006, 08:06 PM
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I think the question is, how will a carb'd 350 with most likely a standard HEI dist work in a computer vehicle? NOT TOO GOOD, all things considered. The computer needs inputs from the fuel injection components on the engine to determine correct shift points for the trans. Sounds like a real nightmare to me? Why did the builder give up in the injection?

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Old 06-17-2006, 08:10 PM
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Ah-ha. I see now. Let me think it over. I'm interested to see what you will do.
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Old 06-17-2006, 08:17 PM
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4L6OE Help.

Sorry,I would like to Know what he will need as an addon to make the transmisson work?
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Old 06-17-2006, 09:24 PM
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In general terms, you will need to replicate all the sensor components that came on the FE setup, throttle position sensor, mass airflow sensor, O2 sensors and so on. Hopefully some of the FE guys can add more info. Bottom line, the computer needs ALL the info from the stock components to determine shift points.
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Old 06-18-2006, 07:03 AM
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You're best bet IMO would be to go to an aftermarket trans controller. I know Moon has one but I couldn't find it online. Here's one by Compushift.
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Old 06-18-2006, 07:45 AM
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should be interesting mixing and matching since the 99 Tahoe needs a PCM to operate certain functions of the vehicle.... like the guage package

IF you use a Comp U Shift controller , there will be trouble codes set since the PCM looks for certain feedbacks from the tranny.

Perhaps a custom program in the PCM would help.
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Old 06-18-2006, 10:05 AM
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4L6OE Help?

Thanks every one,I picked this shop cause of the owners age (68) & what I saw in his shop,experience & a clean shop,the man had over 9 motors ready to install (for sale) & 2 racing cars he was working on .I did shop around ,4 other shops in Tampa,all had a problem with my fuel system ,SFI,but its water under the bridge .Oh yea, he has a Transmission shop next door to him & I hope he can make a deal or swap with them.
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