Engine/Transmission (1998.5 - 2002) Differential Temperature

[badams1]

I am not sure what is an acceptable/ normal temperature here? While "operating under load" with a 10k lb 5er, on a hot Texas 98F day, my 2001. 5 2500 auto with a 3:54 LSD, using a Mag hytec on a dana 70 with 6 qt's of amsoil 75-90W has been running at 210F. Is that hot for flat land? When I had my 3:54 changed out to a 3:73 last week, the guy at Houston Drivetrain said I should be running about 180F. They also noticed some Timpkin bearing wear, so we changed them out, just to be 100%. The truck only had 13k miles on it. Could the Amsoil 75-90W be the problem? I am using Penzoil 75-140w with two btl's of friction modifier for the 500 mile breakin. No towing allowed for the break in. The guy at Mag hytec put me in contact with a lubrication engineer that sells a product that will put all others to shame according to his data. A 30F reduction in temperature is his claim and of course this stuff costs over $9. 00 a qt. Any experience or comments would be appreciated. Yea, I have a case of the Amsoil 75-90W in my garage. What to do??????

 

[LarryB]

I run the LE in my transmission, diff, and OD. On flatland, in double over, pulling 15K+ the diff runs 160-180, transmission same, OD 200-210.



I feel these numbers are quite comfortable.

 

[John Berger]

that sounds about right

I've seen my differential temperature as high as 235 degrees. This was on a very hot day pulling a 9% grade at about 45 mph, dragging my Nomad TT. I've got a heavier Montana 5er now and will be pulling this grade later this month. That temperature was the highest I've ever seen. On a long haul with moderate temperatures, my differential runs 210-220. I just put a temperature gauge in the transmission, so I don't have any idea what it will run. It seems to run a bit cooler than the differential and takes longer to get warm, but I have not had a chance to monitor it on a long road trip.

 

[amsoilman]

badams1,

Your temp seems to me to be in the ballpark. Mine usually runs 200 F. when outside temps are in the high 90's and low 100's. I also have the Mag-Hytec cover and use the Amsoil 75W-90 series 2000. I think if you do some investigating, the synthetic gear lubes will run at lower temps when comparing to petroleum lubes. I have several OVTR Truckers that use the Amsoil 75W-90 in their trucks and they claim the temps are lower than when using a petroleum product as well.

I think you will find using a higher viscosity fluid such as the pennzoil 75W-140 you will also see higher temps.



Wayne

amsoilman

 

[Dsl_Duo]

Does anyone know of a method of installing a temperature probe in the rear differential of a stock unit (Dana 80)?

That is without purchasing a Mag-Hytec cover or similiar... as my "bombing" funds are on the low side right now.



Thanks,

Dsl_Duo

 

[LarryB]

You can drill andt tap the fill plug.

 

[tmacc]

LarryB,

What LE products are using in your truck? I talked to LE in NJ and they were trying to convince me to use a non-synthetic lube. Monolec or something like that. Didn't make sense to me. They only sold it on case quantities or 6 gal containers too. Where are you purchasing your LE from?

Thanks

Tom

 

[LarryB]

I believe it's LE607. It's been a couple years since I put it in. I got it from Mag-Hytec along with my cover.

 

[Oil Man]

LE Lubes

tmacc,



I can help you with your LE questions. I work for LE and have for over 23 years.



There are many LE lubes you could use in your diff. The best are LE Almasol 607 Petro, or Synolec 9920. Both can be purchased from Mag-Hytec in just the right amount (by the quart). Mag-Hytec's # is 818-786-8325. You don't have to buy a large quantity. In lab tests it has been proven that the LE 607 will outperform other well known synthetic oils... in fact it has lower wear than the LE Synolec 9920 synthetic oil. The only thing that the LE 9920 will do is go to a lower temperature than the LE 607. And of the synthetic gear oils tested the LE was the best. Please do not ask me to post the other oil names because I will only post how the LE oils tested against other well known gear oils and not post anything bad about other name oils.



Sincerely,

Kevin

 

[tmacc]

Kevin,

Thanks for the info. I have found your posts on lubrication very informative over the past two years that I have been a TDR member. I don't think the LE sales rep in NJ was talking about the LE 607, so thanks again.

Tom

 

[Elite1]

I have dipricol gauges and have used the trans. temp probe provided to probe my new Mag-hytech differential cover. I can't get the gauge to register... . I'm thinking I may have the wrong probe, since it sits on top and doesn't reach the oil... is this my problem, what is the solution??? Who sells the proper probe?