Not a new member to car forums, but new to this forum.

Have a 99 BMW M3 that is highly modified for track driving, and bought a 95 Dodge Dakota 3.9L 4x4 V6 5speed with 148,000 miles on it recently for DD use.

fixed the emergency brake
new brakes all around with brake fluid flush
new belt with new tensioner
new plugs
new wires
new cap
new rotor
oil change
air filter change
full coolant flush

getting ready to do all the drivetrain fluids and new some help. I have the Haynes manual, and a little searching around on the site, but have not gotten a lot of good info

Manual Tranny-
not sure what manual tranny I have, so I dont know the capacity?
NP2500 - 2qts 10w30 engine oil
AX-15- 3.27qts 75w90 gear lube
NV3500- 1.2 qts Mopar manual tranny fluid #4761526

Transfer Case- Haynes manual shows 2 pts capacity, but no fluid recommendation.. Little help???

ATF+3 Type 7176 auto fluid Haynes recommendation. I'm assuming I can use the Valvoline ATF+4 Synthetic then?

Differentials- New gaskets obviously and RTV sealer
Haynes says a 80w90 gear lube.

I run it pretty hard and would like to go to something a little thicker. Anyone use Lucas 85w140 in the differentials?

I see the fluid level checks are done using the rubber fill plugs for most of the stuff. Keep filling until it starts spilling over on level ground. Just how much is required though?

Any help would be greatly appreciated. :rck:

Calvin

Some pics of my track car, and truck for fun

 

little more searching in the FAQ thread, shows I have the AX-15 tranny, so I have a 3.1L capacity... assuming Valvoline ATF+4 synthetic will work there as well as the transfer case with capacity of 1.2L

differentials from the FAQ as 7.25" in Front with 1.4L capacity. I have the 10" rear brakes (vs. the 11" rear brakes), so I'm assuming I have the 7.25" rear diff as well with another 1.4L capacity.

Instead of running 80w90 diff fluid, can I run a heavier fluid? I can get Lucas 85w140 pretty easily, and that's what I run in my BMW as well, so it would make things pretty easy

 

Welcome to DodgeForum! Thats a clean looking Dakota you got.

For the transmission, this is copied from the FSM:
ATF+4 works great in the t case.

I doubt you have the 7.25" rear. I believe they stopped using those when the magnum era started. I have heard people use heavier gear oil in the diffs with no problems.

Also, as far as the quantities, those are just to know how much to buy, cause as long as your truck is on flat ground, you cannot overfill any of the drivetrain parts. The fill holes are placed in a calibrated place. You can fill each component up to the bottom of the fill hole.

Also, in FAQ2 there are links that you can download the FSM for free. Its covers every aspect of these trucks and can answer almost any of your questions.

 

thanks.. I was able to figure it all out...

just finished the rear diff... the last person to change the fluids used a TON of RTV, and it was a biotch and a half to get all of it off....

ended up going with the proper weight lucas diff fluids, ATF+4 for the t-case, and 75w90 for the tranny...

since I've mostly been working on the BMW all the time, most of my tools are metric, and need to go get some bigger STD sockets for the t-case drain/fill plugs before I can continue..

oh well, another excuse to buy more tools

 

nice looking bmw you have there!

 

thanks


Just finished all the drivetrain fluids... the transmission feels SOO much better with fresh 75w90 in there...

Diffs- Lucas 80w90 with Permatex Black gasket maker (2.1L in rear 8.25 diff, 1.4L in front 7.25 diff)

Transfer Case- ATF+4

Tranny- 75w90 Synthetic Mobil 1 (3.1L)

glad it's all done.. Tranny and Transfer case were super easy. Glad I had the larger metric sockets. Transfer case drain/fill plugs were 30mm plugs, and the tranny drain/fill plugs were 24mm plugs.

Diff's suck. Messing with the covers, and then cleaning all the old RTV, scraping, brake cleaner, and then putting it all back together.

overall, pretty easy, and glad its all done before winter hits

 

Welcome to the forum!
Seeing the picture of your BMW with Chicago in the background makes me really miss Illinois.


Just to clarify: there were 9" and 10" brakes.
Also, they used the 7-1/4" throughout the entire Gen 1 (thru 1996), but was used only on 2WD (2WD had the option for the 8-1/4").

 

Oh, ok... learn something new every day!

 

My problem is, either the new thing I learn pushes something useful out, or I forget it that same day...

 

Well your one up on me then. Everything new I learn makes me forget half the things I knew before. Its a bad process.