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Redline Heavy 75/90 Substitute?

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Old May 12, 2009 | 05:08 PM
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i will never use 75/90 again! ever... i was at 75/140 before and had a quart of the 75/90 in the shop so i used it... never again... it shifts like a shift car! i hate it
 
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Old May 12, 2009 | 05:37 PM
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Damn you guys! I am really confused now. So, this is what I am trying to achieve here. I want that damn clunk to be quieted down and the shifting to be a lot smoother. is is 75/90 or 75/140?
 
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Old May 12, 2009 | 05:49 PM
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75/140
 
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Old May 12, 2009 | 06:07 PM
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75/140 hands down!
 
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Old May 12, 2009 | 06:07 PM
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i used mobil 1 75/90 prior to readline shock proof... i think that the mobile was 1000000x's smoother!
Originally Posted by JRK5892
i will never use 75/90 again! ever... i was at 75/140 before and had a quart of the 75/90 in the shop so i used it... never again... it shifts like a shift car! i hate it

Hey Joe - I'm confused. Did you mean 75/140 in your first post? I have 75/90 in there now, but will switch to Mobil1 75/140 the next go around.
 
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Old May 13, 2009 | 08:33 AM
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You guys also running 75/140 in your primary?

If I run 75/140 in my tranny how often should I change it?

Can you find 75/140 at a place like Autozone? Don't have Pep Boys here.
 
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Old May 13, 2009 | 08:40 AM
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Originally Posted by weaponx53
You guys also running 75/140 in your primary?

If I run 75/140 in my tranny how often should I change it?

Can you find 75/140 at a place like Autozone? Don't have Pep Boys here.
NO. Whatever weight you're running in the engine is what you run in the primary, except not synthetic.

I change my tranny fluid every other engine oil change, (3K)

Check their website, or call them. I assume they would.
 
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Old May 13, 2009 | 01:29 PM
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Originally Posted by archergodwin
NO. Whatever weight you're running in the engine is what you run in the primary, except not synthetic.
I thought primary oil was in the primary case and engine oil is in the oil tank. Why do you have to use the same oil in both?

If I want to run Mobil 1 20W-50 syn in my engine, what should I use in my primary?
 
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Old May 13, 2009 | 03:51 PM
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Originally Posted by weaponx53
I thought primary oil was in the primary case and engine oil is in the oil tank. Why do you have to use the same oil in both?

If I want to run Mobil 1 20W-50 syn in my engine, what should I use in my primary?

Trust me you're not the only one struggling with that. I am doing my 5K this weekend and have changed my mind several times. Currently going with Mobile 1 75w90 in the primary and following Joe's lead with the 75w140 in the tranny. I found loads of information here on the fourm but had to do some major reading. Suggest that you have a look at the info available in the HD Knowledgebase, see https://www.hdforums.com/kbase/primary-oil.html

One thing I found was that the gear oils and motor oil viscositys are not rated the same, ex: 20w50 motor oil is about the same thickness as 75w90 gear oil, read through the poll which primary oil everyone is using, there is a chart several pages in. Sorry I couldn't copy it here, too big to transfer.

Good Luck,
t
 
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Old May 13, 2009 | 05:01 PM
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I think I'm going to give 75/140 a try next time, and see how I like it.
 
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