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ARG
Dodge Dakota
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5/27/2004
13:07:12
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 Subject: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Has anyone done a awap out of the small 10 bolt rear to the larger 12 bolt 9-1/4 rear?
I want to buy an R/T rear end but would like to know if it will fit. Are the shock mounts the same?
Will I have to shorten the driveshaft?
Are the leaf springs going to work?
Please help with any sugestions!!!!
Sincerely, ARG
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Chris
Dodge Dakota
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5/27/2004
21:35:12
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Hey I am not sure if my experience is going to help you much but i did exactly what you are trying to do. The only difference is i used an axel out of a durango so i knew going in that nothing was going to line up. Unfortunately if you are looking for a 9.25 they were much more common in the durangos than the dakotas (or at least more people have wrecked 9.25" durangos than dakotas). The one thing that may be tricky is the input yolk. I got luck and found one that uses the same u-joint that my truck used. You can go to Neapco's web site and look at thier U-Joint catalog to find all the different types of u-joints. The problem is just knowing the year make and model wont always tell you what size joint was in the truck, but at least it is a start. Also some trucks have a flange instead of a yolk, so whichever you have, don't mess with the other.
As far as the dirveshaft goes I dont think you will have a problem. The housing is a little longer but I bet that Chrysler just uses the same driveshaft anyway. If you have a lifted truck like I do then your diveshaft is already pulled out of the slip fitting slightly and this just helps to get it closer to where it should be.
Assuming your truck is a 97 or newer and the axle you are getting is out of a 97 or newer Dakota then i would bet dollars to donuts that the shock and springs are a perfect fit. If you get a durango axle then it is a differnt story, but one that I like better. I cut off the spring perches and bought new ones and new Ubolts. The tubes are 3.5" tubes btw. This allowed me to flip the ubolts so they point up instead of down so there is more ground clearance. Then it is very easy to make new shock mounts and weld them up higheron the axle so that nothing is lower than the tube (except the pumpkin). If yo have a dakota axle you can just cut the mounts off and rotate them up. If you get a durango axle there are no mounts because the shocks bolt to the retaining plat on the springs. If you are ever driving behind a durango look underneath and notice how much crap sits below the axle tube! Sad
Ok so now the drive shaft is in and the axle fits. Next you have the brake system. Well you are a lucky man because everthing is compatable! If you have the 9" drums then just use the 11 inchers on the 9.25 axle. If it didnt come with a backing plate and breaks Chrysler was nice enough to neck down the end of the axle tube so that your backing plate will bolt right up. The rear abs sensors are also swappable. You may want to buy a new one anyway. Chrysler has released at least 2 TSBs regarding the damage inflicted on these sensors by removing them. It is like $28 part and is worth it. They cam in a few different shapes with differnt weird sections of cable and you may have to play with it a little to get the right plugs in the right place at the right time. It sounds tricky but as soon as you see the two side by side you will know exactly what i am talking about and it will make total sense.
Don't forget if you have a 4wd to get the same gear ratio as you have in the front. I went from 3.55s to 3.92 and love it. I swaped the front gears with used factory 3.92 (without doing any kind of setup!). I was hoping that because 90% of the time the front axle has no torque being delivered to it I could get away with it, but there is no front axle disconnect so we will have to wait and see what happens. It has been about 5K miles and so far not a peep out of the front end.
Hope this helps and goooooood luck. Let us know how it goes
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ARG
Dodge Dakota
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5/27/2004
22:18:52
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rear
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Hello Chris, and thanks a ton for the info. The diff I'm looking at is out of a 2000 R/T with big drums, 3.92 gears, Posi, and a huge sway bar with links. I believe all the R/T's came with the bigger 9-1/4 rear end.
Kind regards, ARG
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Modain
Dodge Dakota
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5/28/2004
00:41:12
|  RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Actually, the 9-1/4 rear axle comes with V8 equipped Dakotas. R/Ts only have one engine option - 5.9L V8.
So when ordering build, the extra money for the V8 engine also covers the bigger rear axle.
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matt blough
Dodge Dakota
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5/28/2004
04:13:09
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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this may not appear to be obvious, but its the carpenters motto... Measure twice, cut once...
take measurements of all your alignment points...it'll save you time by preparing you for what you're facing once under the truck.. theres about 10-15 that I can think of, but these are your most important ones...
1. axle to axle... over all width..
2. spring to spring.. obvious, from perch to perch..
3. ceterline... this is where the yoke falls on the overall width.
4. tube diameter... you'll need this for U bolts.
5. yoke size.. (the u joint size....
6. yoke depth.... comparing these two(from old axle to new) will tell you if you need to change driveshafts. based on tube centerline, you can figure out how far your yoke sticks out, since that centerline of the tube will be where the housing is held in place by the springs.....
If all these match up, you'll have a slick install.. all the other measurements I didn't mention would be if you were fabricating a entirely new housing....you don't need to be concerned with those....
What engine are you running? if its a v6, I'd shy away from this....
one thing to keep in mind, before you jump into this... the weight difference may hsrm your speed... unless you really need the heigher strength, it might cost you some of your acceleration... you will be adding weight to not only the vehicle, but also to the rotating mass of the drivetrain.. its gonna take more HP away to rotate the extra weight if those gears......
the added weight in the rear will give you better cornering ability though, since the ass end will be less likely to slide out....
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Turkeyhead
Dodge Dakota
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5/28/2004
10:40:52
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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I have a '97 318 Dak Sport, 4X2, and it has the 8.25" rear end, no limited slip. The R/Ts (as far as I know) all have 9.25" rears and sure-grips.
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ARG
Dodge Dakota
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5/28/2004
12:34:26
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Message:
My 1997 Dak has the 318 V8 (5.2), and it also has the 8-1/4 rear with 10 bolts. It is an "open" diff with 3.55 gears.
I want 3.92 gears with the posi. The easiest (and cheapest) way to go is for me to buy an R/T diff complete with sway bar and mount it in my 97 Dak. The only thing that really concerns me is the yoke and driveshaft length. My Dak is a Club-Cab with the long bed, so I have the two-piece driveshaft with the slip yoke in the center.
There is a local junkyard with two wrecked R/T's and they have all the parts. They want $800.00 for the diff complete with sway bar and drums. Is this a good price?
Anyone have any experience with this?
Regards, ARG
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IntenseDak39
*GenIII*
5/28/2004
17:34:07
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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only until the last couple years did all the V8 start having 9.25's in em. I have a buddy around here that did the swap and i believe everything was bolt in except some have different yokes.
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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matt blough
Dodge Dakota
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5/28/2004
18:00:19
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Message:
$800 sounds good, especially for a 3.92 limited slip set up... it just depends how the trucks ended up in salvage.... if their front end collisions go for it... rear end crash I'd be wary..... only probs I can see is that there really isnt a way to tell what kind of wear they've been through, since the odometers are electric, you'd have to 'turn on' the cluster to figure out the mileage....plus ya cant tell how the past owner 'abused' em or not....
either way $800 for the whole set up sounds decent....
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motion427
Dodge Dakota
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5/29/2004
17:19:47
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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The local Junkyard has 2 R/T's.I have to say they are running 3.92's with trac-lock,but these are 8.25's.I'm fixing a 01 Durango 4.7L and it has 3.55 with trac-lock but it's a 9.25.Maybe because the 3'rd row seat(mine does) could be a factor with the rear axle.Also the 2 R/T's are AWD,mine is part time.
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DakSport
Dodge Dakota
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6/03/2004
13:05:39
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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hey motion if you wouldnt mind hookin me up with this junkyard im looking for either 3.92s or 4.10s with the track loc for my 8.25.
Thanks,
Ryan
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motion427
Dodge Dakota
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6/03/2004
19:18:18
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Message:
These 2 R/T's were crash test vehicles (front end collision test).so the rear diff are new and not bent,Will check if they are still there and how much.Located in N-B Canada.What are you running now?
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daksport
Dodge Dakota
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6/03/2004
21:03:54
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Im in ontario. If there for an r/t they wouldnt fit, i have the 8.25 rear end. thanks
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motion427
Dodge Dakota
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6/04/2004
18:26:42
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Message:
As I said at an early post these are factory 5.9 R/T's and both have 8.25 ring gear and 3.92 with trac loc from the factory(weird).will try to get a $ on them Monday.Did you check how much was for a new gear set for yours(the ratio of your choice),they are not that expensive.We rebuilt a lot of Diff's at the shop.Later
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Motion427
Dodge Dakota
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6/08/2004
20:18:33
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Message:
They have one 8.25,with 3.92 and trac-loc,out of a 2000 R/T(crash test vehicle),for a reason they said it was bent,They want $1000.
Aftermarket gears and a new trac-loc would be close to the same $.But this one is brand new.
They have a second one,but did not ask for the $ on that one.If you are interested you can post your e-mail and I can e-mail the info to you.
Later
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greg black
Dodge Dakota
JOIN HERE
6/05/2015
08:39:09
| RE: Swaping a 10 bolt to a 12 bolt 9-1/4 rea
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Message:
hi im greg i got a 2000 dodge club cab slt plus
v6 magnum 3.9l with 4 speed transmission and
the rear end is a w/lockup torque converter im
look to find out how how much i can tow with
the rear end i have now
trailer wise and im looking not to swap it but
change the gears if i can so i can tow alot
more stuff and need to know what the best rear
end if i had to change it without swaping the
transmission @ engine since i dont got the
money to swap the transmission engine right now
and axles any help i would be greatful cause i
need help on learning my truck inside and out thank u and have a great day ps im trying to
make it look like new when the first person
bought her off the lot
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