Vortec 5.7 paired to th350?

[jackerekson]

Have a 79 c30 I'm doing a lot of work to, it's getting a 91 front clip solid axles and I shortened the frame to fit a short box, have a 97 burb the tranny went out on so I decided to convert to the fuel injected 350, if I keep the th350 in it what would I need to do to make that work?


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[VileZambonie]

The VSS signal

[fitz]

Painless wiring makes a VSS that attaches between your trans & speedo cable for about $150. 

[SkinnyG]

Jags that Run makes a VSS that attaches to the backside of the pinion flange for about $90.

You could get a programmable MegaSquirt ECU for less than a carburetor, and have full control over any modifications you do.  Doesn't need a VSS at all.

[VileZambonie]

I should clarify, it won't have a vss signal but that does not mean you necessarily need it unless you are concerned about DTC's being set or TCC operation (if its a TH350c)

[SkinnyG]

In my reading, apparently the VSS has a role in cruise tuning, as well as deceleration and makes lower engine speed more stable.  I have no first-hand experience though.

[jackerekson]

Could I just pull the whole wiring harness out of the burb and lay it into my truck without hooking up the transmission cable or will it throw the ecu off?


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[SkinnyG]

My understanding is it will throw the ECU off.  A code, plus driveability issues.  But I may be wrong about your particular combination. The project I am wiring up EFI for, needs the VSS for sure.

[VileZambonie]

Is it a TH350 or TH350C? Does it have the square connector on the drivers side?

[Sinister.454]

Sucks because youll need to rig up a electric fuel pump...adds $$ and headaches to the job.
Better to buy a crate engine and run the standard manual pump.
Ask me how I know...