That’s what I was thinking. I’ve only heard good things about the 2004R. Plus anything has to be better than TH250. That 3 speed sucks on the freeway
2004R
- Thread starter Street Sweeper22
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On the driver’s side of the transmission there’s a plug that the external lock up plugs into. My question is what do I do with the factory plug?
It is the same plug as the 2004R. Is the factory ECM controlling lock up?
I believe so. It’s a 4 prong plug with 2 wires.
IMO, the 200-4R is a great upgrade, I love the smooth highway operation with the lockup. Overdrive is mandatory in my mind with a 3.42/3.73 diff if you want to cruise at 60mph peacefully... Right now, I operate the lockup manually with a 12v lighter plug (the ground goes through an oil pressure switch on 4th speed), but will fit a B&M controller soon.
I think I need to double check the code on the rear end I got. I keep saying 2.42 for some reason but I don’t think 8.5 come with that high of a gear. 3.42 rings a bell. I got an external lockup kit like the one you are talking about too. it comes with a switch you can control from the dash. My car still has the computer controlled carb and my th250 has a 4 prong plug with 2 wires that run back up into the engine wiring harness. What does it control and if I don’t use on the new trans is going to mess things up? Or do I even need the external lock up kit because the computer will do it?
And now a days if you are not doing at least 70 on the freeway you get ran over lol
I believe that 8.5 out of a t-type should have 3.42 gears in it. I could be wrong so if anyone knows better please chime in. I did a 200-4r swap into my 84 olds. If you are still using the original computer that plug that goes to the transmission for lock up should work on the new transmission. I did not stay with the computer control so i got a lock up kit from TCI. It works just an extra step. Mine is behind a high revving tire shredding 403 lol. Good luck with your install and happy cruising.
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