dana 44 HYDRA-LOK ????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**jerry moss** · 01-13-2009, 10:38 AM

off topic for sure but curious if anyone has any experience with this set up. we are putting new bearings on the pinion and carrier in the rear differential of an 01 jeep grand cherokee. i tore it down yesterday and noticed a wierd tin plate on the driver side of the carrier with a couple of small ears and a small wing on it. i was cleaning it in the parts washer when i noticed the plate would rotate. i flipped it over and saw the words HYDRA-LOK cast into it. there is a series of holes in the carrier under the plate and i assume it acts as a hydraulic locking device???? the differential is an aluminum center dana 44. anyone know how it works or if it would work in the front 44 in our trucks??? first one i've ever seen.

**special-K** · 01-14-2009, 08:36 AM

Hmmm...Never heard of that bird.Maybe the 4x4 guys can aswer this one.

**jerry moss** · 01-14-2009, 10:22 AM

Tim,
our head mechanic did a little research on this thing and the tin plate is actually two pieces and the wing act as a pickup tube for the gear oil. there is a hole in the reverse side of the plate and it feeds oil to the holes in the carrier assembly.

**CMars45000** · 01-14-2009, 07:11 PM

Yeah we see those from time to time in our shop... Jeep used them on the front and rear of many Grad Cherokees. Then there is a certain amount of wheel spin, the spinning side literally acts like an oil pump and hydraulically locks up, similar to a torque converter when it stalls... They actually work very well for a street driven differential

**CMars45000** · 01-14-2009, 07:12 PM

Oh and Aluminum 44's from WJ's are a unique beast...not the same carrier as other 44's

01-13-2009, 10:38 AM	#1
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,936	dana 44 HYDRA-LOK ????? off topic for sure but curious if anyone has any experience with this set up. we are putting new bearings on the pinion and carrier in the rear differential of an 01 jeep grand cherokee. i tore it down yesterday and noticed a wierd tin plate on the driver side of the carrier with a couple of small ears and a small wing on it. i was cleaning it in the parts washer when i noticed the plate would rotate. i flipped it over and saw the words HYDRA-LOK cast into it. there is a series of holes in the carrier under the plate and i assume it acts as a hydraulic locking device???? the differential is an aluminum center dana 44. anyone know how it works or if it would work in the front 44 in our trucks??? first one i've ever seen. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

01-14-2009, 08:36 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: dana 44 HYDRA-LOK ????? Hmmm...Never heard of that bird.Maybe the 4x4 guys can aswer this one. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-14-2009, 10:22 AM	#3
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,936	Re: dana 44 HYDRA-LOK ????? Tim, our head mechanic did a little research on this thing and the tin plate is actually two pieces and the wing act as a pickup tube for the gear oil. there is a hole in the reverse side of the plate and it feeds oil to the holes in the carrier assembly. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

01-14-2009, 07:11 PM	#4
CMars45000 Registered User Join Date: Jul 2006 Location: Pittsburgh, PA Posts: 204	Re: dana 44 HYDRA-LOK ????? Yeah we see those from time to time in our shop... Jeep used them on the front and rear of many Grad Cherokees. Then there is a certain amount of wheel spin, the spinning side literally acts like an oil pump and hydraulically locks up, similar to a torque converter when it stalls... They actually work very well for a street driven differential __________________ Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle

01-14-2009, 07:12 PM	#5
CMars45000 Registered User Join Date: Jul 2006 Location: Pittsburgh, PA Posts: 204	Re: dana 44 HYDRA-LOK ????? Oh and Aluminum 44's from WJ's are a unique beast...not the same carrier as other 44's __________________ Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle

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