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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 02-22-2011
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gear oil help!

First off, I know the answers probably already been answered but I can't find it. Sorry in advance. I need to change the front and rear diff fluid and I just want to make sure Im using the right fluid. Im driving a 94 4x4 with 135k miles. Just bought it so not sure when last service was, if ever. I picked up some valvoline 80w90 with limited slip additive for the front. I didnt realize that it had the LS add until I got home. Is that ok to use in the front. and then what to use in the rear? I am using a syn atf for the trans case as well. I have seen discussions about this, but it seems to all be for 99 and newer. Just making sure im putting the right stuff in. Thanks for the help!
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Old 02-23-2011
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Anyone? My manual says nothing about what gear oil to use.
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Old 02-23-2011
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80w90 is fine for both front and rear. Putting limited slip additive gear oil in a Non LS diff won't hurt it.

Right out of the haynes Manual:

Front- SAE 80w-90 gear lube. (with LS additive if you have a locker)
Back- API GL-5 SAE 90 Hypoid gear lube
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Old 02-24-2011
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thanks a lot. I havent had time to go pick up a manual, so thanks for the info!
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Old 02-24-2011
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mine also takes 80w90 but I talked to a ford tech and he said I could use 75w140 synthlic
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Old 02-24-2011
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thats in an 03 though right? This is why I was getting confused. some people say 90, 75w140, 80w90. there should be a sticky by year or gen on what to use.
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Old 02-24-2011
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after reading the back of the bottle online I'M going to get 75w90!it has what 80w90 has so now it settled 75w90 it is and it's a little cheaper then 140.
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