What diff fluid to use
#1
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Join Date: May 2006
Location: Anaheim Hills, CA
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What diff fluid to use
Have a 1998 CTD 12V 4x4 with the Dana rear end (limited slip). Wanted to change the fluids, front and rear. Went to dealer to get the fluids, additive and gear oil. Additive was reasonable enought, about $9, but they wanted $40.96 per quart for the gear oil which was a synthetic.
Question is, do I have to use a synthetic? What fluid have you guys used? How many quarts rear, how many quarts front? Does it use a gasket or RVT?
Thanks
Question is, do I have to use a synthetic? What fluid have you guys used? How many quarts rear, how many quarts front? Does it use a gasket or RVT?
Thanks
#2
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Location: Beavercreek,OH
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COASTAL brand 80-90W hypoid gear oil (Not Synthetic)
Posi-Trac Additive in rear
Fill front diff 1/2 to 3/4 below fill hole
Fill rear till it comes out of fill hole then cap off
Diff gaskets plus Mega Black RTV
This is how I Roll
Brandon
Posi-Trac Additive in rear
Fill front diff 1/2 to 3/4 below fill hole
Fill rear till it comes out of fill hole then cap off
Diff gaskets plus Mega Black RTV
This is how I Roll
Brandon
#3
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Dealer was trying to get in your pocket. I recently priced diff. oils at the local Chrysler dealer. 75-140 synthetic was about $25 /Qt., 75-90 quite a bit less. I bought Royal Purple for $12.95 /Qt. at the local CarQuest store.
Dodge has specified synthetics on newer trucks because of higher heat tolerances. Non-synthetic oils seem to work fine on older trucks, at a much lower cost.
Dan
Dodge has specified synthetics on newer trucks because of higher heat tolerances. Non-synthetic oils seem to work fine on older trucks, at a much lower cost.
Dan
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