2004R

Street Sweeper22

Greasemonkey
Thread starter
Nov 18, 2017
145
28
I personally have used a 2004R with 2.56 and 2.78 gears. Not ideal but not the noticeable drag mentioned. The 2.74 first makes the care more responsive in my experience over a TH250 or TH350. A Transgo shift kit, servo and governor mods do a lot to improve the 2004R.
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
 

Street Sweeper22

Greasemonkey
Thread starter
Nov 18, 2017
145
28
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?
 
Oct 14, 2008
8,254
113
Melville,Saskatchewan
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?
 
Oct 14, 2008
8,254
113
Melville,Saskatchewan

gdouaire

G-Body Guru
Supporting Member
Aug 7, 2013
506
43
Québec City, Québec CANADA
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.
 
  • Agree
Reactions: 1 user

Street Sweeper22

Greasemonkey
Thread starter
Nov 18, 2017
145
28
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
 
  • Happy
Reactions: 1 user

fauxfour2

Greasemonkey
Apr 21, 2020
155
63
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.
 
  • Winner
Reactions: 1 user

GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.

Please support GBodyForum Sponsors

Classic Truck Consoles Dixie Restoration Depot Mike's Montes UMI Performance

Contact Admin@GBodyForum.com for info on becoming a sponsor