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Transmission Fluid

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Transmission Fluid #1
jhd11 Joseph Downer Charlotte, N.C., USA Sign in to contact 1970 MG Midget	Topic Creator (OP) Mar 19, 2018 01:42 PM Joined 15 years ago 51 Posts

Good Afternoon All,

What do you use for transmission fluid. My Spridget had Castrol 20w/50 in it when I bought it. We drained the tranny and filled it with Redline MTL and had a shifting issue (maybe unrelated to the fluid!). I have been told to use 50w racing motor oil. Curious as to the general consensus as to what is best to use. Stock box, btw. Thanks in advance.

Joe Downer
Charlotte, N.C.

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Re: Transmission Fluid #2
refisk Rick Fisk Frankenmuth, MI, USA Sign in to contact	Mar 19, 2018 03:16 PM Top Contributor Joined 12 years ago 14,642 Posts

I prefer Redline MT-90. It made a huge difference in the 1-2 shift in my '72 Midget.

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Re: Transmission Fluid #3
saysprite Darryl Saylor Mt. Juliet, TN, USA Sign in to contact 1953 Austin-Healey 100 "Ole Blue" 1960 Austin-Healey Bugeye Sprite "Smokey" 1965 Austin-Healey Sprite "Porky Now Patsy" 1970 MG Midget "Jack" & more	Mar 19, 2018 03:57 PM Joined 18 years ago 2,147 Posts

Miller wrote 20w50 on my SCCR box.

I just wish it would run so I could shift the gears.

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Re: Transmission Fluid #4
57 A Model Sam Seay Titusville, Fla, USA Sign in to contact	Mar 20, 2018 06:29 AM Joined 10 years ago 271 Posts

I built a SCCR gearbox early last year. Been putting MTL in it. Really slick and effortless shifting up and down.
Not real sure of the wear properties of using MTL though. As a new gearbox I've changed the fluid out a couple of times.
So far so good, but Redline is expensive! I probably should use what Miller recommends.

The older I get, the faster I was.

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Re: Transmission Fluid #5
Michael Oritt LUSBY, MD, USA Sign in to contact 1954 Austin-Healey 100 1959 Elva GT160 "Elva MK IV Sportsracer" 1961 Ginetta G4	Mar 20, 2018 07:57 AM Joined 16 years ago 417 Posts

I use MT90 with the MG transmissions in both Elvas, as well as my street Austin Healey 100. It provides smoother and faster shifting than with usually spec'd engine oil whether multi or uni-grade.

I use AMSOIL EP in the G4's steel gear dog box as well as in the diffs of all the cars.

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Re: Transmission Fluid #6
Speedracer Hap Waldrop Taylors, SC, USA Sign in to contact 1967 MG MGB Racecar "The Biscuit"	Mar 20, 2018 08:09 AM Top Contributor Joined 18 years ago 43,723 Posts

I use Valvoline VR1 20/50.

Hap Waldrop
Acme Speed Shop
864-370-3000
Website: www.acmespeedshop.com
hapwaldrop@acmespeedshop.com

Acme Speed Shop www.mgexp.com

MG/ Triumph Performance Street Engines - Cylinder Head Porting for street performance and race - DIY Engine Rebuild Kits With Free Tech Advice - VTO alloy wheels for British Sports Cars, and others

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Re: Transmission Fluid #7
Beagle Bob Eagleson Nepean, ON, Canada Sign in to contact	Mar 23, 2018 02:17 PM Joined 13 years ago 76 Posts

Always used Red Line MT-90 in the same transmission for the last 7 years!!!
Never had a problem.
Bob

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