Gear oil weight - Diesel Forum - TheDieselStop.com
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post #1 of 6 (permalink) Old 04-20-2019, 05:28 PM Thread Starter
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Gear oil weight

I’m only a member to a this forum but I know there are plenty mechanics on it that can answer more then just 7.3 questions. My work truck is 95 Chevy Cheyenne with a v-6... what weight gear oil should I use in the rear pumpkin? Has a seal leak on one side and 168k miles on the original. I’d like to stay away from synthetic oil and keep it cheap. Light truck, no pulling, just hwy miles but this is a Texas truck.

Thanks and in advance sorry it’s not a post about my 7.3 😕

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post #2 of 6 (permalink) Old 04-20-2019, 09:05 PM
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Gear oil weight

Aaaggh- you said the “C” word! Anyway, I think that axle calls for 75W90, which is a synthetic, but I wouldn’t hesitate to use dino 80W90 in it for your purposes.


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IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #3 of 6 (permalink) Old 04-20-2019, 10:30 PM
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The C word is OK, but only if they're at least 40 years old.

Moving your post to Other Technical Questions. I had a '72 Chev and an 84 GMC before I found the light and bought a Ford. IIRC they both used 75W90 gear oil.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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post #4 of 6 (permalink) Old 04-21-2019, 07:14 AM Thread Starter
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Ok good deal I’ll get some fresh oil in her. Im neither for Ford, Chevy, or dodge. I’m a was it a good year for that vehicle person. I like my duallys body style over any of the newer trucks so one day I’ll get the truck completely repainted and park it next to my 01 stepside gmc under a garage. Then I own a 02 3/4 ton z71 gmc. Just because of that body style and motor.

The old man owns a 2007 ford with the small v-8 is hard to change plugs and the window sits to far forward to put your arm out, but he had abused it pulling a 4 bale hauler. It keeps going, had to change the timing chain and the transmissions overdrive is out but it keeps pulling that trailer lol.
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post #5 of 6 (permalink) Old 04-21-2019, 08:03 AM Thread Starter
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I have a question while I have 2 of the forums top people here. On a automatic transmission, someone’s replaced the rear seal it’s noticeably new. The problem is that there is oil slinging under the truck. You would think where that seal is at but it’s clean as can be. I’ve driven 7-8k miles on this truck with it slinging oil. Changed the engine oil and said well I’ll check the trans, throw it in Neutral with the parking brake on and check it and if anything it’s a little above the fill line.

So I got back under there and looked, there’s a small hose on top of the trans, looks like maybe a vent hose. It’s just open, it leads me to think maybe the trans fluid is coming from that hose then slinging off the driveshaft, maybe The people that changed the seal put to much oil in and that hose lets out the extra oil if there’s to much pressure? I can take a picture later but basically there’s a elbow and a 3 inch hose just coming from on top of the transmission.
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post #6 of 6 (permalink) Old 04-21-2019, 04:00 PM
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I think you’re dead on. Overfill coming out the vent and getting slung when it hits that yoke. Correct the fluid level and it will likely resolve.


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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