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Author Topic: Transmission Fluid  (Read 82 times)

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september2021

  • An AMGBA Club Member
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  • Posts: 19
Transmission Fluid
« on: August 06, 2021, 01:27:53 PM »
On my '76 MGB non overdrive I have been mistakenly using 80/90 weight gear oil in the transmission instead of 20/50 mineral oil.

I've driven like this for many years.

I will change it out to 20/50.

My question is

Is there any damage done by using the incorrect weight oil?
Would there be a reason to totally flush out the 80/90 ?
How would I go about rectifying this.

Thank you for your time. Best wishes

Aron Sokol

JohnTwist

  • AMGBA Club Tech Staff
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  • Posts: 121
    • University Motors
Re: Transmission Fluid
« Reply #1 on: August 06, 2021, 01:39:55 PM »
Any oil is better than no oil; 20/50 or 30 weight non-detergent engine oils are the best oils.  In my days at the shop we’ve drained out:  Automatic Transmission fluid (red); 80/90 gear oil; water and oil; and every now and then no oil at all. 

The TR6s use 80/90 and sometimes we would use 80/90 in a noisy Midget box.  You’ll be OK. 

Use the 80/90 in the differential, rack and pinion, and in the carb damper(s).

SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids MI 49506-2410
Cell  616 307 6737
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SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids, MI  49506

616-307-6737
johntwist@universitymotorsltd.com
www.universitymotorsltd.com

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