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Robert
Dodge Dakota
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3/25/2006
17:52:57
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 Subject: 7.25 axle to 8.25 swap
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Does anyone know for sure if the 8.25 axle will bolt in directly inplace of the 7.25, or what is required to make the swap?? I have a Cummins 3.9 4cyl turbo diesel mated to the 3500 tranny. so far all is well except I broke the stock 7.25 and the one I got from the junkyard. I want to upgrade to something a little stronger and uses the factory lug pattern.
Thanks for any help.
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PB
Dodge Dakota
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3/27/2006
19:47:46
|  RE: 7.25 axle to 8.25 swap
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Message:
stock rear end is 8.25 your thinking of 9.75 replace it with that. and it should bolt right up if it's off a a dakota but a ram one might fit, not sure though
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dhwfd46
Dodge Dakota
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4/01/2006
22:02:12
| RE: 7.25 axle to 8.25 swap
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7.25 rear end was stock with 4 cyl. I replaced one in a '94. 8.25 bolted right in, but you need to have the driveshaft shortened, or have a new one made.
Dave
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Robert
Dodge Dakota
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4/25/2006
01:31:42
| RE: 7.25 axle to 8.25 swap
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My swap is complete. Had to shorten the driveshaft, also the u-joints are different so while at the shop I had the new end put on the driveshaft. I now use 2 different part number u-joints. Also the u-joint straps were slightly different, but easily modified to work. all in all an easy swap for the added strength.
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Robert
Dodge Dakota
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6/24/2006
02:43:58
| RE: 7.25 axle to 8.25 swap
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Message:
Still going strong, I recomend this swap if you still have the 7.25. I have abused it pretty hard and have had no problems.
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modain
GenIII
6/25/2006
17:28:31
|  RE: 7.25 axle to 8.25 swap
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Message:
Which rear end and gears did you use? LSD (Limited Slip Diff) - yes? no? What are the HP and TQ numbers of that engine? What is your fuel economy?
Do you have any specifics about the conversion you'd like to pass along? I'm sure there are others that would welcome the knowledge. It sounds like a fantastic success story.
What's your left foot doing?
=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open
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Robert
Dodge Dakota
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3/15/2007
20:58:25
| RE: 7.25 axle to 8.25 swap
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Right now it is still open carrier with 3.55 gears. Hopefully will soon change to 3.21 or so. Getting 22 mpg most of the time. Plan to intercool it when I change the gears. Should hopefully get it to around 26 or so. BTW the 22 mpg is even towing my 3500lb boat.
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gen1dak
Dodge Dakota
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3/16/2007
10:33:59
| RE: 7.25 axle to 8.25 swap
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Message:
Man you need to slap a webpage together on that powertrain swap.
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user101
Dodge Dakota
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3/21/2007
22:09:55
| RE: 7.25 axle to 8.25 swap
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I am doin the same, but I come across a 8.25 out of a 99' model R/T with a limited slip for $150. I had to shorten both axle tubes 1 5/8 in. and relocate the leaf spring perches and shock mounting brackets. I am having some axles made which was the expensive part($350) and I am goin to have to shorten the drive shaft and change the rear u-joint. It was a good bit of work but i think it will be worth it.
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Kowalski
GenIII
3/22/2007
06:22:54
| RE: 7.25 axle to 8.25 swap
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user101 - are you sure that R/T didn't have the 9.25 rear, with the octagonal cover ?
Lead, follow, or get out of the way
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Robert
Dodge Dakota
JOIN HERE
3/22/2007
19:33:52
| RE: 7.25 axle to 8.25 swap
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To user101. My truck is a 91, and it did not require any thing but driveshaft mods. Im not sure why yours is so hard. Im not up on the newer models. Good luck to you though.
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user101
Dodge Dakota
JOIN HERE
3/25/2007
19:36:40
| RE: 7.25 axle to 8.25 swap
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Message:
Kowalski-It is not a 9.25
Robert- i forgot to mention that i am putting this rear end in a 94 model dakota.
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Kowalski
GenIII
3/26/2007
06:00:42
| RE: 7.25 axle to 8.25 swap
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Message:
That seems rather odd, that an R/T wouldn't have the heavier duty 9.25 that it should have come with. The older generation explains why you had to shorten the axle tubes, that's doing it the hard way !
Lead, follow, or get out of the way
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