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88v8
Ivor Duarte
Gloucestershire UK
(1052 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

ATF Type F, G, Dexron
Posted by: 88v8
Date: January 11, 2025 01:28PM

So the original spec for my Borg Warner 66 called for Type G fluid.
I also see recommendations for Type F.

I've been using Dexron III for years, perhaps wrongly.

I can't find any comparison between Type G and Dexron III.

Anyone any ideas please?


DiDueColpi
Fred Key
West coast - Canada
(1386 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: ATF Type F, G, Dexron
Posted by: DiDueColpi
Date: January 14, 2025 02:05PM

All the old BW boxes, 35, 65, 66. Use type "G" Or the old Ford Type "F"
The newer designation is "TQF" or "AQF".
Dexron should never be used. The clutch linings and seals were never designed to handle Dexron fluids.
However, if you are running Dexron now, do not change it back to the original type fluid.
The seals and clutches will have absorbed the Dexron and the trans is now addicted to it.
Changing fluid types now will most likely cause a failure.
If the "66" was rebuilt in the past it's very possible that Dexron compatible seals and frictions were used which would explain your good fortune.

Live like you mean it
Fred


88v8
Ivor Duarte
Gloucestershire UK
(1052 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: ATF Type F, G, Dexron
Posted by: 88v8
Date: January 15, 2025 04:42AM

Thankyou.
The box has been fed Dexron for 15 years, and has been rebuilt, so as you say I'd better stick with what I have.

From what I've read, Dexron gives a softer shift, so maybe no bad thing.


ag1234
Arthur Gertz

(136 posts)

Registered:
03/29/2023 08:26PM

Main British Car:


Re: ATF Type F, G, Dexron
Posted by: ag1234
Date: February 03, 2025 05:58PM

Way way back in AT class, a "trick" for GM automatics was to switch from GM fluid to type F for a firmer shift.
Onward, Art.


MGBV8
Carl Floyd
Kingsport, TN
(4571 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: ATF Type F, G, Dexron
Posted by: MGBV8
Date: February 03, 2025 08:19PM

Did not know that, Art. Then again, I am a 4, 5, or 6 speed guy. I have only drag raced with manual transmissions.


ag1234
Arthur Gertz

(136 posts)

Registered:
03/29/2023 08:26PM

Main British Car:


Re: ATF Type F, G, Dexron, Turbo 400 ?
Posted by: ag1234
Date: February 04, 2025 11:44AM

I know, who cares/lol. Two items helped the GM T400 achieve such respect. 1. All upshifts RELEASE frictions to complete.
2. Being a long main case, a center support bolt, near center of valve body, anchors the internals, (girdle).
2 cents, Art.


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