Manual 3 Speed Fluid

Clutch, transmission, rear axle

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pchelp101
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Manual 3 Speed Fluid

Postby pchelp101 » Tue Jul 11, 2017 8:29 am

What does everyone recommend for fluid in a manual 3 speed? Any advances in modern days?
1969 F100, 390, 3 Speed, 2WD

71Fe2O3
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Re: Manual 3 Speed Fluid

Postby 71Fe2O3 » Tue Jul 11, 2017 10:55 am

I have used plain old gear oil for years without any trouble. I buy whatever is on sale. These transmissions don't need exotic additives. All the oil needs to do is keep the gears lubricated.
Fred

1970 F100 4WD short bed, 360 engine, very rusty plow and yard truck

1971 F100 2WD long bed, 302 engine, on the road

1968 F100 2WD long bed, 360 engine, stripping for parts

pchelp101
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Re: Manual 3 Speed Fluid

Postby pchelp101 » Tue Jul 11, 2017 12:53 pm

71Fe2O3 wrote:I have used plain old gear oil for years without any trouble. I buy whatever is on sale. These transmissions don't need exotic additives. All the oil needs to do is keep the gears lubricated.


That's what I am used to also, the reason I ask is my 1969 F100 is dripping "RED" fluid out of the rear seal. I bet the PO used ATF in it !!! :cuss:
1969 F100, 390, 3 Speed, 2WD

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Jacksdad
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Re: Manual 3 Speed Fluid

Postby Jacksdad » Tue Jul 11, 2017 2:09 pm

If it shifts and sounds okay, drain it as fast you can and throw the right grade of hypoid in there. Leave it overnight to fully drain if you can. I wouldn't bother cleaning it out or rinsing it to get the last of the ATF out - I'm not sure there's any benefit. The next fluid change will pretty much do that.

I bet the inside of your transmission is awful clean :D

.
1971 DRW F350 cab and chassis with an Open Road motorhome conversion, Dana 70, 352 (originally 390)/C6, PS, power front discs, and 159" w/b.

pchelp101
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Re: Manual 3 Speed Fluid

Postby pchelp101 » Tue Jul 11, 2017 3:07 pm

Jacksdad wrote:If it shifts and sounds okay, drain it as fast you can and throw the right grade of hypoid in there. Leave it overnight to fully drain if you can. I wouldn't bother cleaning it out or rinsing it to get the last of the ATF out - I'm not sure there's any benefit. The next fluid change will pretty much do that.

I bet the inside of your transmission is awful clean :D

.


Thanks Jack, I have it on the top of the "To Do" list for this weekend. How difficult would it be to change out that rear transmission seal?
1969 F100, 390, 3 Speed, 2WD

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sargentrs
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Re: Manual 3 Speed Fluid

Postby sargentrs » Sat Jul 15, 2017 9:05 am

IIRC, on my Ford 3.03 with long bed and 2 pc drive shaft, just remove the front drive shaft (unbolt the u-joint and carrier bearing) and pinion yoke (1 big nut), pry out seal and tap another in. Be sure and re-torque the pinion yoke nut. I like to use a 3"-6" piece of large PVC pipe with an end cap on it to drive in seals around shafts.
Randy
1970 F100 Sport Custom Limited LWB, 302cid, 3 on the tree. NO A/C, NO P/S, NO P/B. Currently in 1000 pcs while rebuilding. Project thread: viewtopic.php?f=22&t=59995 Plan: 351w, C4, LSD, pwr front disc, p/s, a/c, bucket seats, new interior and paint.
1964 Ford Fairlane 500. 289/Cruise-O-Matic, A/C, P/S.


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