Ok, so i know how to do it, but i dont know what weight oil i need. I also plan on running full synthetic, and am unsure of a good gear oil brand, I would like to run lucas, but not 100% sure that they have a full synthetic.

Also for Trans fluid, Any full synthetic Mercon ATF will work for the manual right?

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2001 Mazda B-3000 CabPlus "FX2 Off Road"| 3.0 | 5 SPD | 3 In Spindle Lift | Belltech Shackles | UltraGauge |Alpine Head / 10" Kicker Setup | Air Box Mod | Add-A-Leaf| Thrush Welded B4 Rear Wheel | Kobalt Box | Cobra 19 DX IV | Custom PA Speaker | Front/Rear Tow Receiver | 2X Aux Lights | Hideaway Strobes | Back Rack Safety Rack | Amber LED Strobes | Blue LED Strobes | 265/75/R16 General Grabber AT2's

for the diff you will need 90w if you have a posi aka limited slip i believe you will need the friction modifier....

and the tranny i believe you are correct i know a few of the guys here run synchro meshi in their trannies....

I will depend on your diff--I used Mobil 1 75W90 when i did mine--has the friction modifier in it. You'll need 3 bottles if you have an 8.8 with the limited slip. You won't use all of the 3rd bottle. Do yourself a HUGE favor and spend the 7 bucks for a pump that screws onto the bottle.
MikeR

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SOLD---'04 Ranger XLT SuperCab 4x4--4.0 SOHC-Auto--Loaded--Black w/Grey Leather Sport Buckets--Expo OHC--AHI Carbon Fiber-look Trim--Pioneer 290W Sound System--4.10 L/S--Cranked "1" Codes--1" Body Lift--265/75R16 REVO2s--16"x8" Mickey Thompson Classic Lock Wheels with Blue Trim Rings--Bassani Lightning-style CatBack--aFe Intake--Herculiner--Extang FullTilt Tonneau--Black Headlights & Corners--Billet Grille Insert in FX4 Grille Surround--Tinted '06 Tails
New Ride: 2014 Focus ST

I have used royal purple in the past with good luck . Castrol as well .

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Merlin215

2010 Ford Ranger 4 wheel drive
Black
XLT Power Group package

Unless there is a second tag on the differential specifying 75W140, it's 80W90. I believe there have been people posting here that there is a synthetic version of that weight available.

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Sgtsandman's Work in Progress
2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
2019 Ford Ranger STX FX4, Super Crew, 2.3L Ecoboost, 10 speed automatic, 3.73:1 with rear locker, Leer 100XR cap

Hello! Is there a OEM gasket for the rear differential to replace, when I’m doing the drain and fill service? Or does everyone use rtv sealant? If sealant, which one is recommended.

I found a Felpro gasket on Amazon.
Fel-Pro RDS55341 Axle HSG Cover or Differential Seal https://www.amazon.com/dp/B000C2GGAO..._LTb2Eb994VEF5
Or do you have a different recommendation for the rear differential gasket.


Just bought the truck and new to the forum. This forum is so helpful btw!