pimpimusmaximus

I am swapping in a 97 LT1, but am using the harness and PCM from a 94. So far everything seems to work. My question is that the harness and PCM are from a manual car and do not have any transmission hookups (eg. VSS and lock-up). Being that my 700R4 is non-electric and pressure shiftied, would the VSS and lock-up kit be needed? There is nothing to splice into from the harness due to the manual setup from the donor car.

Atilla the Fun

Unless you wasted several hundred dollars on a non-lock converter, you need some lockup control. And even the ZF S6-42 & T56 LT1s used a VSS input. If it got omitted from your harness / computer, then exchange. The VSS can be programmed out, but that's race-only. For street use, keep the VSS. There are several different ways to do it, but do it.

pimpimusmaximus

Fisrt of all THANK YOU for answering. I have been checking this post several times a day snce I posted it and YOU are the 1st to even try to answer. This is by far the most pressing question in my swap. Considering I am re-using my OE 700R4, shouldn't the wiring already be there? I have never had the computer hooked up in my 84. (since I have owned it). and it locks up fine. The converter is indeed a lock-up, but I believe it is a vaccum switch.

DeathStarr89

iTrader: (1)

You can always run a switch to it and manually lock it up. I've had mine like that for a couple years and it's handy. Just don't forget to unlock it when you go to pass someone on the highway.

Atilla the Fun

I'm not on here regularly. Several times some days, skip weeks or months at times. Seems to me that the moderators take a stab at any thread that goes 2-3 days with no replies. When the moderators don't reply, that makes me curious. My '84 T/A LG4 / 700R-4 came with the same vacuum switch as Painless Wiring's lockup kit. Both of them have 2 wires as well as the vacuum port. Painless calls for a brake interrupt, and provides a switch you can find under-dash of most mid-'80s GM RWD A/T vehicles. '84 gad a cable from the trans to the speedometer, and the VSS is affixed to the other side of the speedometer, in the dash where you can't see it. But the '84 signal may not match what the '94 computer is expecting. Dakota Digital can help with that if it whomever tunes your '94 computer can't set it. Once it is driving, the sort of driveability problems you have ( if any ) will be clues to what needs changing ( if anything ). BowTie Overdrives makes a kit to connect the 700R-4 TV cable to your LT1, or you might swap a '90-'92 L98 TB and fab your own bracket. Get everything bolted up, adjust the TV cable, drive the car up and down your driveway, then continue this thread. Or PM me. Or both.