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R_U_FST2
Dodge Dakota
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4/17/2002
16:45:36
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 Subject: Change 3.55 Rear-end to 3.92
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I didn't have time to wait to special order the Dakota I really wanted, and they had 95% of the options including paint on an in-stock one ... the rest is history.
The 5% I wanted was the 3.92 rear-end and now I want to do it. Any thoughts on this, I have already modded the truck but I am just not happy with the 3.55 (can you blame me!). I have the 8.25 axle, which I think most Daks do.
I have some costs on a Dodge 3.92, but they seem kinda high to me ($525CDN, ~$330USD).
Thoughts? Suggestions?
'02 4.7 QC Sport Plus. Patriot Blue.
Auto 3.55, 68mm TB, Ravin Z-33, Autolite 3923s,
K&N Intake, ARE LSII Tunneau
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TEAMFAST
Dodge Dakota
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4/17/2002
17:40:44
|  RE: Change 3.55 Rear-end to 3.92
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I have the same dilemma. I never thought about
changing my axle ratio, now i am kicking myself
for not doing it in the first place.
However, after reading a muscle car publication, i
noticed at the dragstrip, the 3.55 was a common
ratio. As was 4.10. There were also alot of 3.21s.
Whats the deal? Am I just kidding myself that a
ratio change will give me more go? Its been
bugging me for a while.
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R/Truck
Dodge Dakota
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4/17/2002
17:45:42
| RE: Change 3.55 Rear-end to 3.92
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The right amount of change in ratio will increase your 1/4 mile times by as much as .5, but going to low will also hurt your top end power. Some guys with 4.56 gears are faster in the 1/8 but get spanked further down the track.
IMHO - I wouldn't go any lower then 4.11 if you want to drive your truck all the time.
You have to remember the low gears will make your 12MPG go into the single digits.
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Art
Dodge Dakota
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4/17/2002
18:00:35
| RE: Change 3.55 Rear-end to 3.92
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You wont see much diff going from 3:55 to 3:92,I would wait for 4:10`s,you have the heaviest and slowest combo with the auto,IMO what the 4.7 needs is more low end TQ.I have the 4.7 with 3:55 5 speed and it pulls fine except steep steep hills it lacks low end grunt,I`m waiting to see how speedtweaks turbo setup works
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R_U_FST2
Dodge Dakota
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4/17/2002
18:31:36
| RE: Change 3.55 Rear-end to 3.92
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I am looking for 1/8 mile performance gains, mostly for street fun ... no track for this daily driver.
I would be too worried about the 4.10s gas mileage, I drive about 40 mins (one-way) to work everyday @ about 50-60 mph. I figured the best trade-off would be the 3.92.
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Fubar512
Dodge Dakota
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4/17/2002
19:03:49
| RE: Change 3.55 Rear-end to 3.92
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Try getting a hold of some shorter tires.
For instance, I have 28' tall tires (255/65/15)and a 3.55 rear in my truck. If I went down to 25-1/2" tall tire (265/50/15), it would give me the same effect as having 3.92 gears with the stock tires.
Of course, then the speedometer would be reading high (72 at 65 actual speed).
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R_U_FST2
Dodge Dakota
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4/17/2002
19:29:21
|  RE: Change 3.55 Rear-end to 3.92
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Oops, never thought of that.
I suppose I shouldn't have just put on those Goodyear Eagle #1 Nascar 285/60/16's on the rear.
:(
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BLeagues
Dodge Dakota
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4/17/2002
19:57:35
|  RE: Change 3.55 Rear-end to 3.92
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I have a 99 Dak with the 3.55 rear end. I wanted to get bigger tires for my dak, but the guy at the tire shop told me that if I did that I should probably change the rear end in my truck to atleast the 3.92 rear end, because if I don't I will end up replacing the timing chain in my Dak numerous times, is this true?
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Dakaty
GenIII
4/17/2002
19:58:25
| RE: Change 3.55 Rear-end to 3.92
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I went from 3.55s to 4.10s and considered it to be one of the best modifications I have made.
My MPG went from 12.5 MPG down to 12.2 MPG.
I believe that if I could drive now as I did before the change, my mileage would not change or would even improve. However, my truck pulls so well with the 410s I enjoy the HEAVY acceleration.
The QCs are heavy and slow on take offs. The 410s will give you a dramatic improvement.
I had a hard time deciding between 3.92s and 4.10s. Most everyone recommended that I go to 3.92s. However these recommendations were from R/C or C/C owners.
As a QC owner, I promise you, you will be pleased with the 410s.
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intense99dak
Dodge Dakota
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4/17/2002
20:11:58
| RE: Change 3.55 Rear-end to 3.92
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I went from a 3:55 one wheel drive to a 3:90 LSD close to two years ago. It was, without any doubts what-so-ever, the best bang for the buck. The acceleration off the line was greatly improved and highway passing has never been easier. There is no RPM range that you can't tell a dramatic difference.
Just my $0.02
Chuck Robbins
'99 IB Dakota Sport
www.intense99dak.com
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kota on 20s
GenIII
4/18/2002
01:26:44
| RE: Change 3.55 Rear-end to 3.92
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has anyone went from 3.55's to 3.92's with a 5speed? i know the 1st gear in the 5speed is lower than the one in the automatic, so it it worth it?
also, by going to a smaller tire to change the ratio, not only will it throw the speedo off, it will look kind of stupid with a big gap between the tire and wheel well IMHO.
Eric, 98 5.2 5speed, K&N gen II, 50mm TB, 2bbl M-1, 1.7RR's, JBA ciramic headers, carsound cat, dumped gibson, and a lot more
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intense99dak
Dodge Dakota
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4/18/2002
05:32:53
| RE: Change 3.55 Rear-end to 3.92
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I have the 5 speed and when I changed the gears it definitely did make 1st gear lower. I still start off in first gear some times, but it's common for me to start off in second on level ground or when I do a "rolling stop". I can still get up to about 20 mph in first gear before I shift (about 4600 rpm).
Chuck Robbins
'99 IB Dakota Sport
www.intense99dak.com
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kota on 20s
GenIII
4/18/2002
13:40:12
| RE: Change 3.55 Rear-end to 3.92
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since you have done this would you do it again, or is 1st gear just too low?
Eric, 98 5.2 5speed, K&N gen II, 50mm TB, 2bbl M-1, 1.7RR's, JBA ciramic headers, carsound cat, dumped gibson, and a lot more
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intense99dak
Dodge Dakota
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4/18/2002
17:12:13
| RE: Change 3.55 Rear-end to 3.92
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I would definitely do it again although this time around I would probably go with 4:10's as my new tires are a little larger than my stockers and I lost a little gearing.
As for 1st gear being too low, sometimes it is a pain in the arse, but more times than not I'm very glad to have a low first. Especially when I can sit in stop & go traffic and just leave it in first and idle along. Saves my clutch leg :-)
Out of the bolt-on mods that I've done to my Dak, the gears gave the best, most pronounced seat of the pants improvement.
Chuck Robbins
'99 IB Dakota Sport
www.intense99dak.com
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kota on 20s
GenIII
4/18/2002
18:26:59
| RE: Change 3.55 Rear-end to 3.92
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thanks, im the oppisite way with tires. mine are smaller than stock, so it took my 3.55's to 3.64's. if i do 3.92's they will be about a 4.01's
Eric, 98 5.2 5speed, K&N gen II, 50mm TB, 2bbl M-1, 1.7RR's, JBA ciramic headers, carsound cat, dumped gibson, and a lot more
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R_U_FST2
Dodge Dakota
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4/18/2002
19:59:49
| RE: Change 3.55 Rear-end to 3.92
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This is nuts, I called the dealership to talk to them about maybe finding someone who had a 3.92 who might want to switch ... and they told me that it wasn't likely. So I told them to put together a price for me, based on the dealership doing the work (to preserve my warranty).
They came back at $725.00 for the 3.92 and $500.00 for installation, they figured it was a 5.5hr job. The parts price seems really excessive to me, and 5.5hrs labor .. I mean that is the better part of a day.
FYI, those prices are CDN ... so the price in USD would be roughly $454.00 and $313.00.
They trying to take me for a ride?
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kota on 20s
GenIII
4/18/2002
20:08:57
| RE: Change 3.55 Rear-end to 3.92
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HOLLY CRAP!!! i have found several places and the average price is about $400 for everything.
if you have a 4x4 then its a differant story, because they have to do both diffs
Eric, 98 5.2 5speed, K&N gen II, 50mm TB, 2bbl M-1, 1.7RR's, JBA ciramic headers, carsound cat, dumped gibson, and a lot more
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R_U_FST2
Dodge Dakota
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4/18/2002
21:23:23
| RE: Change 3.55 Rear-end to 3.92
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Nope, 4x2. With less than 4000miles on it (not that it makes any difference).
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intense99dak
Dodge Dakota
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4/19/2002
05:32:24
| RE: Change 3.55 Rear-end to 3.92
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The installation price isn't too bad from what I've heard, but the price of the gears is definitely high.
I don't know if this will be any cheaper for you being in Canada, but check out www.ring-pinion.com/ This is where I bought my stuff and they had the best price on the net or locally.
Chuck Robbins
'99 IB Dakota Sport
www.intense99dak.com
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BLeagues
Dodge Dakota
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4/19/2002
07:51:36
| RE: Change 3.55 Rear-end to 3.92
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In reply to R_U_FST2, have you checked at the local salvage yards? You could probably find a rear end for a Dakota with the 4.10 rear end and bolt it on in place of yours cheaper than that. If you know a mechanic that does work on the side that will save you half the labour. If you can't find the whole rear axle at a junk yard, they may have just the gears and you can swap em out with yours.
Just an idea.
BLeagues
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kota on 20s
GenIII
4/19/2002
12:06:23
| RE: Change 3.55 Rear-end to 3.92
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no dakota came with 4.10 gears, and finding one in a junk yard will be REALLY REALLY hard. hell just finding a dak in a junk yard alone would be hard
Eric, 98 5.2 5speed, K&N gen II, 50mm TB, 2bbl M-1, 1.7RR's, JBA ciramic headers, carsound cat, dumped gibson, and a lot more
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