I have been wanting to do this for 10 years, since installing 3.73 rear gears. That was the plan. Newly arrived Extreme Automatics 200r4. PTC 9.5” 2500 torque converter. Getting my stuff together to put it in this fall. Car now has TH400 and stock converter so this should get the old G block up quicker. .224 duration Lunati cam needed more converter for sure. Has 285 /40/18 rear tires so it should get motivating with the converter for sure. This was the best 200 they offer . I am upgrading the u-joints to 1350 series so the pinion yoke is.562”longer, along with a new transmission yoke the TH400 driveshaft will be the right length for the 3/4” shorter 200r4. I think it’s going to work well with the mild cam locked up in 4th gear at 45 mph or so without lugging.
Could always upgrade to a 455 engine but the 400 is not too bad for my need of speed these days. At least I can break the transmission in with it and make sure the 250 lbs. line pressure doesn’t eat the thrust bearing in the engine.

Extreme automatics 200r4 ready for the fall.

 

Tell me what you think.
I don’t have a dipstick yet. Was going to see if the th400 tube would work . Maybe remark the full line?