which gear oil in a track lock d44

I need to no which oil to run in a track lock d44 75cj. Also in the t15 and d20. Thanks.
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Normal gear oil for all, like a 85/90, but you need the limited slip additive also for the rear end.

 

^Yup.
Plain ole 80/90 with Limited Slip Additive, without the additive the clutches in the TracLok will chatter and it can cause long-term problems.

 

Supposedly API GL-5 is optimum for differentials. Plus the friction additive.

You can get other weights, but 85W90 is likely the closest to the factory spec.

"...hypoid gears normally seen in automotive differentials require API GL-5 concentration and performance of extreme pressure additives because of their spiral sliding action. For everyday driving API GL-5 performance and SAE 75W-90 viscosity is recommended. Heavy towing or hauling may require the use of API GL-5, 75W-140 viscosity since pressure between the ring and pinion gears are elevated."

http://www.amsoil.com/articlespr/2007/article_gearoilbasics.aspx

 

can i buy the additive at napa.

 

Yes. O'Reillys too.

 

Thanks for the info guys. I checked with napa and they have what i need.