rear end swap - Dodge Durango Forum and Dodge Dakota Forums
Gen I Dakotas 1986-1990 Dakota-Specific Questions

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post #1 of Old 02-11-2008, 06:36 AM Thread Starter
kams
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rear end swap

what year 8 3/4 will fit in the stock location in my 1988 dodge dakota, cause already have a 3.23 sure grip for it, and truck has mild 318 5 speed but want to end up putting turbos on it with a rebuilt engine.

thanks
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post #2 of Old 09-03-2008, 04:58 AM
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I, too, am curious. A 318 will probably grace my first gen's bay after this winter, and I don't think the 7 1/4 will like that.
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post #3 of Old 09-07-2008, 02:05 AM Thread Starter
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66-70 b body rear ends will fit
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post #4 of Old 09-12-2008, 05:38 PM
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I agree, I have a 68 b body 8.75, and it looks like there won't be any problems at all. I'll be putting it in for a test fit this weekend actually. I'll post up pics and info on it over the weekend. I also know that 70-74 ebody 8.75s will fit as well. Marty from KRC put one in his 96 Dak a few years back. Did a decent write up on it as well. Most of the infor you will need about the swap is over on Bionicdodge.com. Not premoting other sites, but the info is there if you want/need it.

11 Durango R/T
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91 Dakota Ext cab4/4 Drop
390 Stroker W/TKO 600 finally in truck.
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post #5 of Old 09-15-2008, 02:55 AM
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I got a 1970 A-body 8 3/4 with 3.55's under my 1988 Dakota pictured below...handles 530hp that my 451 stroker hits it with. B-E body rear ends are too wide and will not fit right under the truck.


Use an A-body 8 3/4 rear housing because the A-Bodies and Dakotas share almost identical track width. Just cut the original spring pearches off, and have new ones welded in the proper location to accomodate the springs. This rear end fits like it should've been there from the factory when done right.

..........2002 Dakota SXT 3.9 Liter..................................1988 Dakota R/T 451 Stroker............

Last edited by WarlocK451; 09-15-2008 at 03:02 AM.
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post #6 of Old 09-15-2008, 04:15 PM
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Quote:
Originally Posted by charger_340 View Post
I, too, am curious. A 318 will probably grace my first gen's bay after this winter, and I don't think the 7 1/4 will like that.
there were many a 7.25" rears behind 318's. my 69 barracuda had one. granted its considers as low performance and all, but its not like a mildly built 318 will bust it any.

1997 dakota, 5.2v8, msd wires, trans cooler, K&N cai, 1.6 rr's, stinger 1700 battery, updated big 3. aeroturbine 3030 muffler, high flow cat. conv
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post #7 of Old 09-15-2008, 06:09 PM
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Quote:
Originally Posted by realdeal7369 View Post
there were many a 7.25" rears behind 318's. my 69 barracuda had one. granted its considers as low performance and all, but its not like a mildly built 318 will bust it any.
Hmm, I had a friend smoke multiple 8 1/4 in his FS Dodge with a high mile 318 in it, but he also beats the piss out of stuff more than anyone I know. I'll probably run the 7 1/4 for awhile until I find the perfect 8 3/4.

Last edited by charger_340; 09-17-2008 at 11:26 PM.
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post #8 of Old 09-15-2008, 06:38 PM
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http://www.moparts.org/Tech/Archive/axle/17.html

Heres the info I used for my selection. Go take measurements of your existing housing and go from there.



Quote:
Originally Posted by slammedR/T
SHIT! I'll check that hunk of shit off,on pump gas and driving to the track.

CHECK!
R.I.P
http://www.dakota-durango.com/forum/...ad.php?t=90566
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post #9 of Old 11-30-2008, 01:18 AM
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Rear end

I had a 66 charger 8.75 under my 89 shelby. Had to redo the perches and fab shock mounts. These are wider than the A bodys, but if you get the right backspace on your wheels they work fine. When I decided to mini tub and narrow decided to go bullet proof and narrowed a dana 60. Took an old 3/4 ton truck dana and whacked the ends off, welded on new ends and ordered moser 35 spline axels. works great. also remember this, when you break a rear end there is a good chance it will also take out the tranny.
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post #10 of Old 11-30-2008, 02:12 AM
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^Wow, do you have any full body shots of that truck? I'd love to see some.
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post #11 of Old 11-30-2008, 02:19 AM
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rear end

Here is what I have so far. I'm having to compress the images. 410 LA 500HP pump gas with a 150 shot. 2 year project.
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post #12 of Old 11-30-2008, 02:12 PM
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Quote:
also remember this, when you break a rear end there is a good chance it will also take out the tranny.[/

If your going anymore than 400HP with a torque flite, a bolt in sprag clutch is a must. The factory sprag clutch is just pressed in and when the rear end unloads is shocks the sprag so hard that it typically will break loose, its RPM will double that of the engine's and explode...resulting in holes in the floor, roof, you... see my point... many times the explosion is so severe that a explosion shield wont contain it. An eplosion blanket is a must over 600 hp.

..........2002 Dakota SXT 3.9 Liter..................................1988 Dakota R/T 451 Stroker............
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post #13 of Old 11-30-2008, 04:02 PM
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Warlock is correct. Bolt in sprag and as many other HD parts as you can afford. I found the weak link in my 518,46rh, when the hub on the back of the input shaft snapped off. Talked with Rick at AA and ended up with 2000.00 in HD parts. Bolt in sprag, billet 2nd gear hub, stainless input shaft and hub etc. Haven't been able to break it since. I'm getting too old to be pulling trany's very often
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post #14 of Old 12-01-2008, 02:10 PM
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I wanted to put a 8 3/4 in my dakota but I couldnt find one that was less than 600 bucks that was set up like I wanted. So I went with an 8.8 out of a 94 exployer 4 wheel drive and it fit great. I found one with a limited slip, 3.73 gears, and 31 spline axles. I ground off the old mounts and put some mopar performance spring mounts and comp. eng. shock mounts. I know that alot of mopar guys would consider this sacreligious but it was a cost thing for me. I got the rearend at the u-pull it junkyard for 60 bucks and although it took several hours to get it out it was well worth it.
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post #15 of Old 12-16-2008, 05:51 AM
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I have an 8 3/4 rear that is 5/8" wider than a stock dakota rear. 5x4.5 lug pattern, 742 center section, just needs backing plates, brakes and drums (which are the same off from an 8 1/4 rear), and the spring perches welded in for a dakota width. I am unsure of the gear ratio. It can be yours for the low, low price of $100. Just PM me if interested.
The 742 housing is the non crush sleeve housing, so it is more desirable.
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