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kj
Dodge Dakota
9/08/2001
10:33:55
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 Subject: 9.25 Differential Question
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Message:
I have the 4.7/Auto/9.25 with 3.55 setup. Sometimes it feels like it's going to break a u-joint when I shift into reverse. The engine idles low so I know it's not from too many rpm's at the shift. What I'm asking is this normal behavior and the nature of the beast or is something out of whack? I think I heard one time that these rear ends always have some slack in them or something of that sort. Thanks in advance.
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Zaurusman
Dodge Dakota
9/09/2001
00:59:52
|  RE: 9.25 Differential Question
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My u-joints always makes a noise when I engage the driveline, if that's what you mean. But it does so in first or reverse without preference. Also clunks or grinds going into reverse. Hasn't given me problems in it's almost 60K miles with 9 drag strip runs in there, but the rearend definitely needs a fluid change very 15 thousand. There's also always a mild almost scraping sound as the shaft turns or rearend gears spin, and a mild whine from the tranny though mine is not the same as yours (AX-15). Just a noisy drivetrain IME.
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Zaurusman
'98 RC V6 5spd
http://www.tiborsrealm.com/Dakota/Index.htm
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Zaurusman
Dodge Dakota
9/09/2001
01:05:00
| RE: 9.25 Differential Question
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Message:
Clarification: Makes a clunk or grind going into reverse with the clutch still in, and only most of the time; makes the noise engaging the driveline when I let out on the clutch. HTH.
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Zaurusman
'98 RC V6 5spd
http://www.tiborsrealm.com/Dakota/Index.htm
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kj
Dodge Dakota
9/10/2001
15:07:16
| RE: 9.25 Differential Question
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Message:
It's kind of like a hard snapping and clunking action and it only does it going into reverse. It doesn't do it all the time.
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Darryl
Dodge Dakota
JOIN HERE
2/01/2008
13:12:03
| RE: 9.25 Differential Question
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I have the 4.7/Auto/9.25 with 3.55Diff. I am thinking of switching out the 3.55 and replacing it with a 2.71. Is there a rebuilt kit available? And what level of problem would I be facing from minor to major? Will the case be large enough for the new gear package? Thanks
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miltonwaddums
Dodge Dakota
JOIN HERE
2/01/2008
13:55:31
| RE: 9.25 Differential Question
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Why do you want that kind of torque reduction (~24%)? Do you have any engineering to back this swap up? Why 2.71? You're not going to save any fuel by doing this swap, so just drop in a 4 banger. Probably get about the same amount of torque and use a lot less fuel.
Why the 7 year old thread?
Jay
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dude
Dodge Dakota
JOIN HERE
2/01/2008
14:01:24
| RE: 9.25 Differential Question
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Darryl
why a 2.71 ratio ???
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darryl
Dodge Dakota
JOIN HERE
2/01/2008
14:04:37
| RE: 9.25 Differential Question
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A garage offered it as an alternative. I was originally thought to change to a 3.21 rear end.
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daddio
Dodge Dakota
JOIN HERE
2/01/2008
14:38:17
| RE: 9.25 Differential Question
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i believe you will kill your mileage with that swap. some of the 4.7 guys that psot on here have posted gains of .5-2mpg going the other way with 4.10:1 gears.
what exactly is your truck? 4x2, 4x4, QC, CC or RC. what kind of mileage are you currently seeing?
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darryl
Dodge Dakota
JOIN HERE
2/01/2008
14:47:43
| RE: 9.25 Differential Question
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It is a 2 wd club cab with no posi and it gets 15 - 16 mph. I was told by the charts that a 3.21 would lower the rpm at 70 mph around 200 rpm and a 2.97 would lower about 400 rpm.
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dude
Dodge Dakota
JOIN HERE
2/01/2008
15:04:07
| RE: 9.25 Differential Question
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it will lower the RPM's but the engine will
be lugging well below it's ideal powerband
like many say, the 4.7 actually responds better
with a 'higher' gear, with the stock tire size (or near stock) a 3.92 ratio often is ideal for acceleration AND milleage.
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Darryl
Dodge Dakota
JOIN HERE
2/01/2008
15:11:15
| RE: 9.25 Differential Question
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Thanks for the input. I don't know if it is worth it to make any changes. All I know is that with out posi, it is impossible to start on even damp pavement without spinning the tires. It could use some more gas millage, it is not a work truck so trailering is not important.
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dude
Dodge Dakota
JOIN HERE
2/01/2008
17:47:06
| RE: 9.25 Differential Question
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find what's worn and causing the noise,
fix your axle, if the gears aren't worn keep your 3.55
if worn, find another 3.55 from someone changing their axle to another ratio,
prefferably a complete Trak-Lok carrier since traction seems an issue for you.
Look for other ways to get better gas millage,
driving habits, higher tire pressure, synthetic oils etc.
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Kowalski
GenIII
2/02/2008
08:35:06
|  RE: 9.25 Differential Question
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Message:
The guys are making some good points here. And the case will always be large enough when going to taller gearing. It is only when going to lower gearing (higher numerical) that there can be an issue with case size; as they are the larger gears. If what you really want is better traction, there are better units than the stock limited slip out there. I went with the Auburn, it works quite well.
Lead, follow, or get out of the way
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