Tri_X_Troll Posted September 24, 2009 Share Posted September 24, 2009 86 MJ, 2.8L, ax-5 The 231 in my TJ was relatively quiet, the 207 in my MJ is very whiney. Is this normal? Does the 207 run ATF like the 231? Link to comment Share on other sites More sharing options...
64 Cheyenne Posted September 25, 2009 Share Posted September 25, 2009 yes and yes. The 207 has straight cut planetary gears in it so it's definitely kind of noisy in low-range.High-range is straight threw 1to1 so you shouldn't hear any appreciable noise from it in 2wd. The 207 I had was low on oil,after I filled it,it was a little quieter,but still made some noise in low range. Link to comment Share on other sites More sharing options...
Tri_X_Troll Posted September 25, 2009 Author Share Posted September 25, 2009 It seems noisier in 4hi than it does in 2hi....? I just need to keep my eyes out for a 231. Link to comment Share on other sites More sharing options...
Eagle Posted September 25, 2009 Share Posted September 25, 2009 It seems noisier in 4hi than it does in 2hi....? I just need to keep my eyes out for a 231. A 231 is noisier in 4WD than in 2WD, too. Link to comment Share on other sites More sharing options...
Tri_X_Troll Posted September 25, 2009 Author Share Posted September 25, 2009 I don't remember it being much louder in the TJ. But then a TJ with 33k on the odometer is goign to be quieter than an MJ with 133k on it. I should check the fluid levels though. Link to comment Share on other sites More sharing options...
Lenard Posted September 25, 2009 Share Posted September 25, 2009 is the 207 as good as the 231? Link to comment Share on other sites More sharing options...
Tri_X_Troll Posted September 25, 2009 Author Share Posted September 25, 2009 From what I gather, it's not as good. The 231 is geared a little lower and the cut of the gears is different. Not much better, just more refined. Link to comment Share on other sites More sharing options...
Eagle Posted September 26, 2009 Share Posted September 26, 2009 The low-range ratio in the 207 is a couple of hundredths less than that of the 231. Not a huge difference. IIRC, the 207 low range was 2.61 and the 231 was 2.72. The real difference is that the 231 has better oiling. As to noise, the pitch on the gears for the 231 changed, which might account for a newer one in a TJ being quieter. A couple of people on NAXJA encountered problems some years ago trying to mix and match input gears between 231 boxes. I can't think of any reason to change the gear pitch without changing the ratio unless they were trying to make it run quieter. Link to comment Share on other sites More sharing options...
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