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DakotaMan
Dodge Dakota
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5/21/2002
15:05:55
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 Subject: Rear Gear Oil
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Message:
Ok folks I am upgrading to 4.56 gears and a posi lock in my 3.9l 98 slt. My question is what grade of oil should I put in, the oe book says 75-90 I think. I was wondering if it would be ok to put something like 80-140 I thought it might be better, but I dont know. Any info would be great!
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intense99dak
Dodge Dakota
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5/21/2002
18:44:30
|  RE: Rear Gear Oil
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Message:
When I had my gears and posi installed, the installer put in Valvoline 75/140 (non-synthetic). He said that this was the best stuff for rear ends and he's definitely qualified to make this statement (you ought to see the cars he works on :-) I live in New England and run it year round with no problems and have not heard any noise what-so-ever from the rear end.
Whatever gear oil you go with, be sure to change it out after 500 miles and put in some fresh stuff.
Chuck Robbins
'99 IB Dakota Sport
Visit my site at intense99dak.com
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DakotaMan
Dodge Dakota
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5/21/2002
18:52:47
|  RE: Rear Gear Oil
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Message:
Thanks I will go with that one then.
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Dr. D
Dodge Dakota
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5/21/2002
22:02:24
| RE: Rear Gear Oil
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If you decide to use the 75W-140 make sure that
the gear lube meets the Chrysler MS-8985 Specs.
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AmsoilSponsor
Dodge Dakota
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7/17/2002
08:45:58
| RE: Rear Gear Oil
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Message:
DakotaMan,
How did things go? I'm following up on older posts to see if I can be of any service.
As to whether you should use 75w-90 or 75w-140, personally I would use the synthetic 75w-90 since synthetic 75w-90 will perform above and beyond the recommended petroleum 75w-90.
I have Freightliner customers driving Class 8 Tractor Trailor Trucks using 75w-90 synthetic gear lube in their difs. Tuff enough for them ... Tuff enough for me.
If you or anyone else have any further questions regarding transmission lubricants let me know?
Steven Roark, Amsoil Dealer, Proud Sponsor of DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants and Truck Care Products
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