front and rear diff

[bohawg]

Ok i have a 94.5 powerstroke and noticed i was alittle low in the front so i put 80/90 non synthetic,, ok well i was about to change the back and i pulled the plug and noticed around half inch of silver sludge so now ive decided instead of siphon out and put new in i should pull the plate off and clean it out good,, What do you all think? also what weight of gear oil should i use in the back? someone said to use synthetic in the back,, my buddy which is head mechanic at a big contruction compony in myrtle beach said to use 80/90 the front and back and it will be fine... hes got alot of service trucks so im not sure now what to do,, let me know fokes

[mrmanners]

I would recommend pulling the cover and check everything while doing this service. For fluids, AMSOIL makes the best gear lube on the market today, it is called Severe Gear. For your truck you need the 75W-90 front and rear. I don't say this because I can; I say this because there is a study to back it up. Read about it here. They recently updated the formulation and improved its lubrication qualities even more.

I would get 2 qts for the front and 4 for the back. This might give you a little extra but now you will have some for top offs.

If I can help with products, please let me know.

Take care,

[terryknight]

i changed mine and used amsoil severe gear can;t remember whether i used the 75-90 or the heavier one. if you have a limited slip make sure you add the friction modifier or whatever the extra additive is.

[bohawg]

so you think i should drain out the 80/90 gear oil that i got from walmart??? I put it in the front... i was thinking i would leave this in there for the winter and looking into taking the plate off the back and getting the 75/90 for the back... what do you think?? im sure 75 to 80 wouldnt be that much difference would it??

[mrmanners]

Was it synthetic 80/90? To me it would depend on the cold pour point to ensure you are not going to be too thick during the winter.

[bohawg]

no it wasnt synthetic.... i had wrote on another site the same question and one guy said on his owners manual it calls for 80/90 front and back,, said he had the manual right in front of him,,, so im hoping i can get by with what i did in the front but before i do the back i want to get all imformation as i can

[mrmanners]

Here is your truck from the AMSOIL Look Up Guide. I highlighted the Front and Rear Diffs. It calls for 80w-90 in the back but AMSOIL also recommends the Severe Gear 75W-90 which is the best gear lube around right now. That is why I went with that recommendation for you.

You will be fine with the 80/90 until you can make the switch in the spring. It is just thicker oil.

1994 FORD TRUCKS F250 HD PICKUP 7.3L 8-cyl Engine Code [F/K] Turbo Diesel
LUBRICANTS & FLUIDS:
Engine Oil
Grade 1......CH-4

SAE 30 Synthetic Diesel Oil (ACD1G) SAE 30 Synthetic Diesel Oil (ACD1G)
Series 3000 SAE 5W-30 Synthetic Heavy Duty Diesel Oil (HDDQT) Series 3000 SAE 5W-30 Synthetic Heavy Duty Diesel Oil (HDDQT)

Above 32 F......30 [1]
Below 90 F......15W-40
Manual Transmission,T-18......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,5-SPD ZF......MA [2]
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,5-SPD ZF......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,5-SPD Mazda......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,M5OD-R2......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,5-SPD Mazda......MA [2]
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,4-SPD BW T18-19......MA [2]
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,S5-42......MA [2]
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,4-SPD BW T18-19......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Automatic Transmission,C6-deep......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Automatic Transmission,C6-Shallow......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Automatic Transmission,E4OD......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Differential, Front......GL-5*
All TEMPS......75W-90
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
Limited Slip Differential, Rear......GL-5*
All TEMPS......80W-90 [3]
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
Limited Slip Differential, Rear......GL-5*
All TEMPS......80W-90
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
Transfer Case,Warner 1345......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Transfer Case,W/ PTO......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Transfer Case,Warner 1356......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Fluids
Power Steering Fluid......FA
Synthetic Supershift Racing Transmission Fluid SAE 10W (ARTQT)
Brake Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
Clutch Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
[1] SAE 30 is preferred.
[2] spec. No ESR-M2163-A2 or equivalent
Use only Synthetic Mercon
[3] Limited Slip Identification: Letter & number
on plate on door lock pillar. (Models W/ Traction-Lok Rear
Axle Add 4 oz of friction modifier part no. C8AZ-19B546A
(EST-M2C118-A) or equivalent)
FILTERS:
Oil Filter WIX 51742 Oil Filter
Air Filter WIX 46317 Air Filter
Fuel Filter WIX 33617 Fuel Filter [1]
Fuel Filter WIX 33417 Fuel Filter [2]
Fuel Filter WIX 33217 Fuel Filter [3]
Transmission Filter WIX 58968 Auto Tran Filter [4]
Transmission Filter WIX 58967 Auto Tran Filter [5]
[1] e spin-on w/ drain and sensor port
[2] e spin-on w/ drain
[3] Open-end Bottom that takes a reusable plastic bowl
[4] 4WD
[5] 2WD
NGK PLUGS AND WIRESETS:
No Recommendations
WIPER BLADES:
Blade Class Driver Passenger
ExactFit T182 [1]
ExactFit T181 [2] T182 [1]
ExactFit T181 [2]
NeoForm T16180 [1]
NeoForm T16180 T16180
Winter T37180 [1]
Winter T37180 T37180
[1] Early
[2] Late
CHASSIS LUBRICATION:
2WD
4-10 Fittings, 0 Plugs..........LM
Series 2000 Synthetic Racing Grease NLGI#2 GC/LB (GRGCR)
Synthetic Multi-Purpose Grease NLGI #2 GC/LB (GLCTB)
Synthetic Water Resistant Lithium Complex Grease; NLGI #2 GC/LB (GWRCR)
4WD
0-7 Fittings, 0 Plugs..........LM
Series 2000 Synthetic Racing Grease NLGI#2 GC/LB (GRGCR)
Synthetic Multi-Purpose Grease NLGI #2 GC/LB (GLCTB)
Synthetic Water Resistant Lithium Complex Grease; NLGI #2 GC/LB (GWRCR)
CAPACITIES:
Engine, with filter..........9.9 quarts [1]
Cooling System, Initial Fill..........29.1 quarts
AMSOIL Antifreeze and Engine Coolant
Automatic Transmission, E4OD Initial Fill..........6.5 quarts
Automatic Transmission, C6-Deep Pan Initial Fill..........6 quarts
Automatic Transmission, C6-Shallow Pan Initial Fill..........5 quarts
Automatic Transmission, Total Fill
3 speed C6-Deep..........13.6 quarts
3 speed C6-Shallow..........Not Specified
4 speed E4OD..........Not Specified
Manual Transmission, M5OD-R2..........7.7 pints
Manual Transmission, T-18..........7 pints
Manual Transmission, 5-SPD ZF..........6.8 pints
Manual Transmission, S5-42..........6.8 pints
Manual Transmission, 4-SPD BW T18-19..........7 pints
Manual Transmission, 5-SPD Mazda..........7.7 pints
Differential, Dana 44 Front..........3.6 pints [2]
Differential, Dana 50 Front..........3.9 pints [2]
Differential, Dana 60 Front..........6 pints [2]
Differential, Dana 60-IU Rear..........6.4 pints [2]
Differential, Dana 70 EX HD Rear..........6.6 pints [2]
Differential, Dana 70 HD Rear..........7.4 pints
Differential, Dana 80 Rear..........8.5 pints [2]
Differential, Ford 10.25 RingGear Rear..........7.4 pints [2]
Differential, With 8.8 or 9 RingGear Rear..........5.5 pints [2]
Transfer Case, W/ PTO..........12.3 pints
Transfer Case, Warner 1356..........4.1 pints
Transfer Case, Warner 1345..........6.4 pints
[1] When refilling, remove dipstick to provide adequate venting
and allow oil to flow into crankcase.
[2] Fill to no more than 1/4 to 9/16 inch below fill plug hole.
TORQUES:
Oil Drain Plug.....28 ft/lbs
Manual Transmission BW T18 4-SPD
Fill Plug 25-40 ft/lbs
Manual Transmission
Fill Plug 25-30 ft/lbs
Drain Plug 25-30 ft/lbs
Transfer Case
Fill Plug 12 ft/lbs
Drain Plug 12 ft/lbs

[rolsmojave3]

I would pull the cover and clean it, then fill'er up with your choice of gear lube.

[Nitro41]

im pretty sure the rear end takes 85-140 synthetic. and then i put regualr valvoline 80/90 up front.