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Author Topic: Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?  (Read 3606 times)

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Offline Cormac417

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Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?
« on: July 17, 2014, 12:56:39 PM »
What type of oil should I use to change the gear oil in a 1975 manual 4-speed 74WT top-loader transmission?
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Offline PintoMan1

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Re: Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?
« Reply #1 on: July 17, 2014, 08:22:45 PM »
I use a 80-90w gear oil
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Offline amc49

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Re: Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?
« Reply #2 on: July 17, 2014, 08:52:37 PM »
That'll work fine.......... ....
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Offline Starliner

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Re: Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?
« Reply #3 on: July 19, 2014, 09:34:31 AM »
Redline MT-90 75W-90 GL4 will protect your synchros.   
it will also smooth out your shifting. 

You can buy it from Summit Racing online. 
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Offline dick1172762

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Re: Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?
« Reply #4 on: July 19, 2014, 12:17:17 PM »
Quote from: Starliner on July 19, 2014, 09:34:31 AM
Redline MT-90 75W-90 GL4 will protect your synchros.   
it will also smooth out your shifting. 

You can buy it from Summit Racing online. 
      RED LINE IS THE OIL TO USE BAR NONE.
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Offline amc49

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Re: Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?
« Reply #5 on: July 19, 2014, 03:48:24 PM »
If you go to GL-5 which automatically has slip additive in it like for Positrac limited slip units it would probably be even smoother and the synchro brake surface would not wear as fast.......... ..
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Offline ToniJ1960

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Re: Manual 4-speed 74WT Toploader Transmission: What type of oil should I use?
« Reply #6 on: July 21, 2014, 07:26:20 PM »
 I got a rebuilt transmission for my 78 6 or 7 year ago,all I used was pennzoil 90w I think they sell a type for hypoid gears. I know the gears in the transmission arent straight cut thats why ou cant shift too well without a clutch like some other cars. So I would assume the hypoid gear lube would be good. My transmission is still perfect and so quiet :)
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