since i have to rebuild my rear end .i am wondering if there is a better posi unit that can be used in the dana 44.love to hear what your using and why . thanx in advance

I am unaware of anything but the D44 or a spool... this is why hard core drag guys go up to a Ford 9" or a Strange D60 live axle rear.

The D44 is pretty stout, but the case does become a liability after a while. So does the IRS.

You need to search deep as to what your next plan is, I guess...

would like to go a solid 9 in but cant swing the expense right now. i am going to call some of the upper end rear end guys and see what they suggest. i do know i want to switch to 430 gears so the car runs closer to the red line at the stripe . with the 392 the car is only turning 5100 through the lights

I think 4.10 is about as far as can be gone in the D44 case... after that, you may need to machine some metal out of the case to make it work.

There are other options, bigger drive shafts, made from CF, bigger yokes, ujoints... things like that.

one of the newer zr1 owners put 430s in his i will have to ck and see what hoops he had to jump through to get them to fit . thanx for the heads up

I know Detroit makes a True Track for the Vette/Viper D44 IRS.

Other than that your stuck with the stock posi or modifying a D44 spool by drilling it for set screws to hold the stub axels in.

I've contemplated doing a spool in my car a number of times but I always end up just putting new clutches in the posi.

I can tell you with the power my car has the clutches only lasted about 35-40 passes before I started getting the occasional single wheel peel in the burn out box.... the last 10-15 passes I have made this year were all very easy on it in the burn out box to prevent (yet) another exploded posi unit.

There are a hundred options for lockers/posi/diffs for the regular D44 and I've often wondered if the only difference between them and our IRS diffs is how the side gears (spider gears) are machined for the Clips that the IRS stub axels use v/s regular C Clips for the D44.

It's just too much $$$ to buy one of each diff to see whats up and the tech lines are always like "you have what?? and you want to do what??"....

So for me next year it looks like I'll put new clutches in it again and contemplate building another center section with a spool.

Yukon Gear makes up to a 4.56 ratio gear set for our cars... Currently I have a 4.11 and my car and it traps 127+mph in the 1/4 mile (in good air). Once I get the tune sorted and the car starts making the power it should I'm good to about 134mph before I run out of RPM (7200) with my engine combo. I using 4th gear and running a 315/35R17 radial tire.
Will

I never hear about anyone working on the posi in these.

I assume they wear out and lose grip. I can turn my posi with a breaker bar on the spindle nut so I can't imagine 200 ft lbs amounts to a hill of beans when the rear tires are laying down 2,500 ft-lbs of torque (after gear multipication).

Is there a spec to check these against?

Is there any aftermarket stuff for the Cherokee D44ICA? Although I've heard the carriers are different and only the ring/pinion are actually shared between them and the C4.

thanx for the info . my car with 392 traps117-119. usually in 2600 ft da . .if i use the drag time correction tool .it shows 121. my black zr1thats a fully ported motor with 410s runs 1130s @ 12400 in the same weather uncorrected . for that car the 410s are about perfect. i think i blew the spiders out of the rear in the white car it mahes a low boom when going slow and turning either way. so since i am going to get into it thought i might try another gear and posi. but i guess the price of the true track is around 600 and with xmas coming and 14 grandkids better not buy it

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I found this info.

http://www.earlycj5.com/forums/showth ... wer-lok-rebuild-questions

What I have found on mine is once the clutches start not clicking my TQ wrench below 100FTLBS it starts spinning one tire occasionally in the water box. I know it's a matter of time before it breaks something doing that.

I use a TQ wrench set on 100LBS with a 36mm, car in neutral and one rear tire off the ground. I check it after every race. Once it got below 100LBS this year I could watch it get weaker in big jumps every weekend.... the next weekend it was down to 75lbs and then 50lbs the week after that, which is when they shut the track down. Now there is some regular street driving added in there every week as well but I don't beat on this car on the street. Like I said mine lasted 35-40 passes before it went below 100LBS.

For the newer Jeep D44. Aftermarket there are electric lockers, air lockers, Detroit Locker, Eaton clutch type posi, Aurburn cone type posi, True Track.... pretty much everything.

Without actually having one in my hand to compare I can't say how different they are. I'd like to see one first hand and compare it to my Corvette diff, just to see if I could make it fit....

Which reminds me... our new Grand Cherokee has the Quadra Drive II.... D44 lockers front and rear.... Maybe I can talk Elsie into letting me "change the diff fluid"....
Will

Will - this is a case where begging for forgiveness is better than asking permission.

i am a little new to rear ends can one rebuild a posi unit or is it best to just buy a new one ? also where is the best place to get new spiders

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You can rebuild them. SOB to get them apart when the clutches are all burnt and welded together thou....

Here are some of the clutch and spider gear kits.

http://www.ringpinion.com/PartsList.a ... D=91&Category=Clutch+Kits


http://www.drivetrainspecialists.com/ ... posi-service-parts-1.html

You can also just buy an entire new posi unit but then you have to reset the back lash and that is no fun on a D44 since the shims are on the inside of the carrier brgs.

http://www.ringpinion.com/PartsList.a ... ry=Posi+%2f+Positractions

http://www.tomsdifferentials.com/catalog.asp?pg=33

Althou not advertised people have bought spider gear sets from both Tom's and Randy's in the past.
Will

I just don't feel like messing with gears... There are ppl out there with the tools to set them right and I ain't one of them!!!

i think yo may be right after talking with my buddy bill boudreau aka zf doc . i am going to buy the needed parts and take it to him . we are also going to take a look at the tranny he built for me . i have put 110k miles on it and he is curious to see what it looks like inside. i must say this tranny is the very best single mod i have done to either of my zr1s. both trannys shift so easy and fine,and short thanx to his custom shifter plus with his detent mod i have never missed 3rd gear in over 300 runs down the strip in both cars . before having him do them it was a crap shoot trying to catch 3rd gear