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| '88 Getrag syncromesh fluid (Page 1/1) |
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JOE 4RE
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OCT 21, 08:30 AM
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We're getting ready to replace the transaxle fluid in my Fiero (around 120K miles) and I see there are two GM Syncromesh fluids.... the regular OEM syncromesh (ACDelco# 10-4006) and a Professional/Gold friction modified syncromesh fluid (ACDelco #10-4014). Which would be the better fluid to utilize?
THANKS------------------
JOE 4RE
'88 Fiero GT
Med. Red Metallic
loaded 5 speed
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Vintage-Nut
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OCT 21, 10:58 AM
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There are 2 types of GM Synchromesh Transmission Fluids:
Standard and Friction Modified which both are the same viscosity: SAE 75W-80
ACDelco 10-4006 is the 'standard' fluid, and the bottle also has (GM) 88900333 on the label.
ACDelco 10-4014 is the Synchromesh - Friction Modified fluid and the bottle also has (GM) 88900399 on the label.
Both fluids are 'Friction Modified', however the Friction-Modified version dosage has 5% more and has a friction additive for LSD clutch packs that require a GL4 fluid.
The standard fluid lacks the friction additive.
Read more on this thread from last year:
GM Synchromesh transmission fluid question by Rsvl-Rider
https://www.fiero.nl/forum/Forum2/HTML/147395.html
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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles
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JOE 4RE
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OCT 21, 11:19 AM
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| quote | Originally posted by Vintage-Nut:
There are 2 types of GM Synchromesh Transmission Fluids:
Standard and Friction Modified which both are the same viscosity: SAE 75W-80
ACDelco 10-4006 is the 'standard' fluid, and the bottle also has (GM) 88900333 on the label.
ACDelco 10-4014 is the Synchromesh - Friction Modified fluid and the bottle also has (GM) 88900399 on the label.
Both fluids are 'Friction Modified', however the Friction-Modified version dosage has 5% more and has a friction additive for LSD clutch packs that require a GL4 fluid.
The standard fluid lacks the friction additive.
Read more on this thread from last year:
GM Synchromesh transmission fluid question by Rsvl-Rider
https://www.fiero.nl/forum/Forum2/HTML/147395.html
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V-Nut, thanks for the link to the more in depth thread. So it sounds like the standard Syncromesh (10-4006) or equivalent should work fine in my stock '88 GT?
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JOE 4RE
'88 Fiero GT
Med. Red Metallic
loaded 5 speed[This message has been edited by JOE 4RE (edited 10-21-2024).]
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Vintage-Nut
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OCT 21, 01:32 PM
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| quote | | standard Syncromesh (10-1014) or equivalent |
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I believe you mean ACDelco 10-4006 and yes, it should work fine in a stock '88 GT.
And of course, the link has members opinions and comments.... 
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JOE 4RE
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OCT 21, 01:36 PM
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| quote | Originally posted by Vintage-Nut:
I believe you mean ACDelco 10-4006 and yes, it should work fine in a stock '88 GT.
And of course, the link has members opinions and comments.... |
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CORRECTED... thanks  ------------------
JOE 4RE
'88 Fiero GT
Med. Red Metallic
loaded 5 speed
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fierogt28
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OCT 30, 08:04 PM
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The synchromesh fluid required in the Getrag is GM part number 89021808
The USA number is 12345349
I believe that was the old number.
The other member has the updated GM number.
88900333
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fierogt28
88 GT, Loaded, 5-speed.
88 GT, 5-speed. Beechwood interior, All original.
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Vintage-Nut
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OCT 30, 08:14 PM
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Yes, GM changed synchromesh part numbers over the years....
The 'Newest' GM number is 88900333 for 'Standard' Synchromesh in the USA, which formerly was 12345349
And Canada and USA have different GM / ACDelco numbers; Canada is 89021808
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