Dana 44 question..

[thinkofthecows]

Hello,

i just scored a rear Dana 44 out of an 1987 xj....there is only one issue(well maybe not if i get the response that i want :rof I have a 1991 xj that i would love to put the 44 in but my axle ratio that is in my dana 30 is 3.55 and the ratio in the Dana 44 3.54. My question is ... would it bind my transfer case even though there is just .01 of a differance?....

thanks,
Tom

 

[JEONLYEP]

3:55 and 3:54 are basically the same thing...

No problems


My XJ is geared 5:13 front and 5:14 rear



.

 

[Gravesdiggerxj]

no binding
most folks say you can be up to .05 difference and be ok.

I'm 4.88 front and 4.86 rear. Drove fine on on concrete today

 

[YELLAHEEP]

Won't be a problem.

 

[5-90]

HUGE problem - bring it here, and I'll dispose of it for you!:gee:

J/K - you'll be fine. OEM ratios typically differ by a point front/rear - 3.07/3.08, 3.54/3.55, 4.10/4.11, and like that.

 

[Hypoid]

Same gears in my F-100. The T-Case is part time, so no dry pavement in 4WD.

 

[JohnJohn]

Be sure to run it off a curb at a high rate of speed every other day. That will reset everything.

:bs:

 

[thinkofthecows]

thank ya'll so much.... ya'll gave me exactly what i wanted to hear.....now anyone in need of a 35 with 194,000 miles on it??? lolarty:

 

[bluejeepkid]

why??????

 

[bluejeepkid]

ya if its free and your willing to pay shipping to 86442

 

[5-90]

why??????

They're typically biased toward the front axle. I've not yet been able to confirm, but I'm fairly sure it's so that the front axle can "pull" the vehicle - especially handy if you're recovering from a skid, get mildly stuck, or something like that.

Part-time transfer cases usually bias toward the front, and likely for a similar reason.

 

[FlexdXJ]

huh that wasn't the case on my cousins powerchoke. He swapped in a 1-ton axle in the front and it had either 4.10s or 4.11s and the rear had vice-versa and he destroyed his spiders gears as soon as he put it in 4wd

 

[5-90]

huh that wasn't the case on my cousins powerchoke. He swapped in a 1-ton axle in the front and it had either 4.10s or 4.11s and the rear had vice-versa and he destroyed his spiders gears as soon as he put it in 4wd

Curious. I wonder if it wasn't a coincidental material failure? I don't think I've ever seen the front and rear axles with the same ratio...

 

[Hypoid]

The explanation I read here os all places, is that the axles are rarely the same, and thus the ring gears are no the same diameter: No way to get identical sets.

 

[Fred]

Part time transfer cases bias 50/50, since the front and rear turn at the same speed.

Fred

 

[5-90]

Part time transfer cases bias 50/50, since the front and rear turn at the same speed.

Fred

Hm. Wonder why I'm thinking 52/48, then...

 

[Fred]

Couldn't tell ya. Just remember that a part time case is "locked". There is no provision for the front and rear axles to turn at different speeds, thus it has to be 50/50.

Fred

 

[Skully]

Hm. Wonder why I'm thinking 52/48, then...

......maybe that's why they warn you not to drive on hard surfaces/pavement in 4wd? :shhh:


.....unless you have something like the np242 which has the doesn't lock the t-case 50/50 option.

 

[5-90]

Couldn't tell ya. Just remember that a part time case is "locked". There is no provision for the front and rear axles to turn at different speeds, thus it has to be 50/50.

Fred

Hm. Could be - I'll have to dig around on that some more when I start digging around on transfer cases again.