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  #1  
Old March 18th, 2009, 10:08 PM
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Dana Hammersley
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Transmission Ratios?

Does the Defender auto tranny have the same gearing ratios as the DI auto tranny?
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  #2  
Old March 19th, 2009, 06:55 AM
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Charles Galpin
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I'd like to know the answer to this. I have a DI auto tranny in my '94 and I think it is geared higher than a defender (at least it seems to be).
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  #3  
Old March 20th, 2009, 07:07 AM
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Dana Hammersley
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Someone has to know the answer to this one.
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  #4  
Old August 4th, 2009, 10:58 AM
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Justin Church
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im curious to know the answer to this question as well!
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  #5  
Old August 4th, 2009, 11:14 AM
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I have a Zf auto in my D90 300TDI. It is a model 4HP22, (trany built in1996). I also have a 1985 BMW524td (owned since 1988) with a Zf 4HP22. BOTH have the same gear ratios. The 1997 D90, had a 4HP22 with the same ratios, and the 4.0 gas motor as well. Every 4HP22 I've ever encountered has the same gearing. The difference lies in the shift body (shift points) and the trany input & output components. Never had a problem with one, they seem to be bullet proof. The 1985 has obout 225K miles on it with only fluid & filter changes.

Dennis
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Old August 4th, 2009, 12:25 PM
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Charles Galpin
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Mine is a 4HP22, but I don't think it's the shift points that I am feeling as a higher gear ratio. Take for example if you are starting from a standstill at an obstacle. With a manual transmission you put it in a gear (1st) and when you let out the clutch the gearing is static. With my auto, I have to rev the engine a certain amount to get the torque converter to start apply force to the wheels. There is no gear changing going on here. So whatever this is called, is what I dislike about my auto box.

Same with going down steep inclines. I can engine brake with my manual, but with the auto box it rolls a lot faster (making it feel like it is gear too high). I'm sure this is the same issue with the torque converter needing to spin at a certain speed to hold.
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Old August 5th, 2009, 11:09 AM
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The ratio diiferences are most likely in the transfer case as these ratios do vary. Stock differentials are all the same.

Charles, do you manually put your shifter in 1st in both of your situations? I know when my trany is cold, & if I'm parked in a rut, it has a hard time pulling out of it. If I wait about 2 minutes, it seem to pull fine. I've heard others write about an internal pump, just behind the torque converter. They've said it is weak & needs to be changed, but it hasn't been that big of an issue to go to the trouble to tear it down and replace it for "possible" results.

Dennis
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Old August 5th, 2009, 01:37 PM
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Charles Galpin
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Yes I have tried forcing it to be 1st gear and want to say it possibly helped going downhill, but not trying to get over an obstacle. This is a rebuild, and maybe it's been setup/tuned to be "soft" for a luxury car feel or something. I dunno.

I'll need to find the markings on the transfer case and see - maybe that's the difference. I now have 4.11 gears in my diffs but still get low rpms at highway speeds - much lower than others are reporting (although I thought the high was the same on the transfer case gearing and only the low changed).
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  #9  
Old August 6th, 2009, 01:17 AM
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Charles, At about 62 mph, my rpm's are right at 2200. The 4HP22 trany locks up into 4th at about 52 mph and the rpm's there are right at 1800.
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  #10  
Old August 6th, 2009, 08:12 AM
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Jamie Austin
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The NAS D-90's have a 1.2:1 transfer box don't they? that'll make all the difference compared to a normal defender 1.4:1
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  #11  
Old August 6th, 2009, 08:25 AM
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Justin Church
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Ive got the ZF4hp22 automatic mated to a 1.667 transfer case , running 3.54 gears and at 62 mph I am running about 3000 rpm's with 33 inch tires.

I am hoping that by going to 35's, it will get me somewhere around 72 mph at 2800 rpm.

Justin
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  #12  
Old August 6th, 2009, 08:28 AM
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Charles Galpin
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I'm going to have to do a highway run to get the numbers as my memory is shot, but after putting in 4.11 gears I think I'm around 2400/2500 @ 70-75. Used to be 2-3K lower before regearing. I'm running "33"s which I think are more like 31"
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  #13  
Old August 6th, 2009, 09:30 AM
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Scott T
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Quote:
Originally Posted by cgalpin
Take for example if you are starting from a standstill at an obstacle. With a manual transmission you put it in a gear (1st) and when you let out the clutch the gearing is static. With my auto, I have to rev the engine a certain amount to get the torque converter to start apply force to the wheels. There is no gear changing going on here. So whatever this is called, is what I dislike about my auto box.

Same with going down steep inclines. I can engine brake with my manual, but with the auto box it rolls a lot faster (making it feel like it is gear too high). I'm sure this is the same issue with the torque converter needing to spin at a certain speed to hold.
I'm not an auto tranny expert by far (hate them actually, but that's another conversation), but I think what you are describing is how the torque converter is designed/set-up. I believe that you can have the torque converters 'tuned' to account for this phenomenon, but I'm sure there is a trade off as well.
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