Most efficient axle

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The Dark Side of Will
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Re: Most efficient axle

Post by The Dark Side of Will » Sat Sep 25, 2010 10:39 pm

New Trade:

$75 + 5 hour round trip for 29 spline Chrysler 8 1/4

vs.

$225 at the same location for an '86 Cherokee axle--I assume to be Dana 44 (listed as 3.54 gears) Is this actually a D35?

vs.

$350 + 7 hour round trip for '88 Cherokee D44, listed as 3.55 gears.

Were there actually both 3.54 and 3.55 gearsets for the D44? I understand that the tooth counts are different. (Edit: Summit lists both 39:11 (3.55) and 46:13 (3.54) gearsets for the D44).
I found this page: http://www.lunghd.com/Tech_Articles/Sus ... Ratios.htm
Which seems to indicate that '86 Cherokees could be had with both the 35 and the 44. Is this the case?

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Re: Most efficient axle

Post by SilverXJ » Sun Sep 26, 2010 9:17 am

Yes, the 86 could be had with the D35 and D44. IIRC the D35 of that time is slightly different. I don't think it had c-clips, but not sure.

I would get the 8.25. The only advantage the D4 has over the 8.25 is that it doesn't have c-clips.
I don't know about the ratios.

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Re: Most efficient axle

Post by The Dark Side of Will » Sun Sep 26, 2010 9:30 am

After posting the above, I was looking around on NAXJA. I found the thread from which you'd pulled that tabulated info and one or two others in which guys were saying they had 8.25's and beat on them pretty hard. The 8.25 should be fine.

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Re: Most efficient axle

Post by SilverXJ » Sun Sep 26, 2010 1:12 pm

Another option is a Ford 8.8. They can be had with discs already on them. However, you would have to do weld the sring perches on and all. Also, its about an inch narrower than the XJ axles. That can be made up with spacers. The 8.8 is stronger than both the D44 and 8.25. However for your needs i think the 8.25 will be plenty strong. Unless you put a modified V8 in there.

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Re: Most efficient axle

Post by The Dark Side of Will » Wed Sep 29, 2010 1:49 pm

Not currently planning a modified V8, but who knows? I'll probably just accept the fact that if I do, I'll have to upgrade the rear axle. I'd have to upgrade the front anyway.

Current plan is eventually build a 4.6 stroker. These engines come in about 250 HP/320 TQ, with RPM limited by crankshaft torsional vibration to about 5100.
The NP229 has a 2.7 low range stock. The current first gear is 3.79, but I'd like a 2.95 (or taller if I score a TKO) plus a light flywheel for more fun on pavement.

Since both axles are at the same outfit, I'll probably just make the drive and look at both.

I guess this is no longer "most efficient axle" is it? Now it's more like "strongest easy-to-swap axle for the $$"

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Re: Most efficient axle

Post by The Dark Side of Will » Mon Oct 04, 2010 9:51 am

Found a yard local to my parents' house (NOT on www.car-parts.com ) with a '98 3.55 8.25 for $75, I pull. Also two Grand Cherokees so my dad and I can each grab a set of disks. Problem solved. Will probably snag it next weekend if the weather's nice.

I called the yard 2.5 hours away about the D44 from the '86 Cherokee. It was an old stock number and they had already *CRUSHED* the car. With the axle? With a Dana 44? srsly? WTF? Sometimes I wonder how junk yard guys stay in business.

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Re: Most efficient axle

Post by The Dark Side of Will » Sat Oct 09, 2010 9:30 pm

Went to the yard today and grabbed the 8.25 and three sets of disks from Grand Cherokees.

After I got the 8.25 out of the Cherokee, I noticed an '87 Wagoneer in the crush row... I went to look at it and it had a Dana 44. Really? I checked and it had 3.54 gears. Sweet! I talked to the yard manager about it and he said that since it was in the crush row he'd let me have it for the same price we'd agreed on for the 8.25. Nice! Score!

So now I have a D44 for my Eagle for cheap. It has the 5x4.5" hub bolt circle. It has drums and no C-clips. Because it doesn't have C-clips, it appears to have a larger back plate flange than the D35/D44 disk brakes we had been getting from GC's. Swapping over to disks may be more difficult. The later D44's in GC's appear to have C-clips.

So how does one do a disk swap on an '87 Wagoneer Dana 44?

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Re: Most efficient axle

Post by The Dark Side of Will » Sat Oct 09, 2010 10:46 pm

I found this page on putting the newer disks on an older D44:

http://www.pirate4x4.com/tech/billavist ... index.html

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Re: Most efficient axle

Post by The Dark Side of Will » Sat Oct 23, 2010 9:58 pm

Here's a pic of the D44 after removing the drum brakes, but before cleaning
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100_9204-1.JPG
Axle with drum brakes removed, before cleaning
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Re: Most efficient axle

Post by The Dark Side of Will » Sat Oct 23, 2010 10:00 pm

After pressure washing in the quarter car wash... I'm still going to have to go over it with a wire brush on an angle grinder. I intend to clean/prepare it thoroughly and paint it with POR-15.
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100_9205-1.JPG
Axle after pressure washing in quarter car wash
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Re: Most efficient axle

Post by The Dark Side of Will » Sat Oct 23, 2010 10:01 pm

Old drum brakes
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100_9203-1.JPG
Dana 44 drum brakes from 1987 Wagoneer
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Re: Most efficient axle

Post by The Dark Side of Will » Sat Oct 23, 2010 10:04 pm

Caliper brackets from late '90's Grand Cherokee Dana 44
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100_9202-1.JPG
Dana 44 caliper brakes from late '90's Grand Cherokee
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Re: Most efficient axle

Post by pdq67 » Sun Nov 07, 2010 6:39 pm

I have NOT read this past the 1st page.

Anyway, I want to say that our back then " bought new", custom ordered '77 4-dr Matador 6-banger STOCK had a road-geared damn near a heavy 12-bolt GM posi under it, BUT with AMC's crappy 2-piece axle/hub jobbers.

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Re: Most efficient axle

Post by The Dark Side of Will » Sun Nov 07, 2010 6:55 pm

We did run into a late '70's Wagoneer that had a GM 12 bolt under the back. We measured the spring and hub widths and it should go into an Eagle pretty easily. The front end of that truck had a 2.72 Dana 44, so I assume the 12 bolt was a 2.72 or 2.73. The axle was on the ground, so we couldn't get under the truck to look at it directly.

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Re: Most efficient axle

Post by pdq67 » Fri Mar 18, 2011 8:36 pm

"We did run into a late '70's Wagoneer that had a GM 12 bolt under the back."

Fwiw, I ordered our new '77 AMC Matador 4-dr. back then with a h-d suspension, the 258, 6-banger, MOPAR 904 auto and a posi- rearend..

Looking under the car, the rear looked just like a 12-bolt, but it had 2-piece axle/hubs so go from there!

Almost, but not 100 percent a GM 12-bolt rearend!!

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