 GL4 or GL5 |
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| 930cabman |
 Apr 10 2026, 01:14 PM
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#1
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Advanced Member  Group: Members Posts: 4,581 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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Not sure how but I had been using Sta Lube GL4 in my tranny, switched to Sta Lube GL5 this season, what a difference.
Feels more slippery (IMG:style_emoticons/default/driving.gif) |
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| Root_Werks |
Apr 10 2026, 01:18 PM
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#2
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Village Idiot Group: Members Posts: 8,936 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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Smoother shifting?
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| 930cabman |
Apr 10 2026, 01:24 PM
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#3
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Advanced Member Group: Members Posts: 4,581 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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Yes and very smooth into 1st (IMG:style_emoticons/default/aktion035.gif)
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| Root_Werks |
Apr 10 2026, 01:35 PM
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#4
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Village Idiot Group: Members Posts: 8,936 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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| rjames |
Apr 10 2026, 03:02 PM
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#5
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I'm made of metal Group: Members Posts: 4,448 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest
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Yup. GL5. The thread that cemented it for me:
http://www.914world.com/bbs2/index.php?sho...980&hl=gear |
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| Superhawk996 |
Apr 10 2026, 05:51 PM
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#6
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914 Guru Group: Members Posts: 7,776 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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GL4 is great to use . . . If your goal is to destroy your differential.
914’s don’t have a transmission . . . They have a transaxle which contains a differential . . . Which requires GL5. |
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| JamesM |
Apr 11 2026, 12:15 PM
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#7
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Advanced Member Group: Members Posts: 2,189 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
GL-1
Synchro's work on friction https://www.napaonline.com/en/p/NHF65201?sr...5VdZ9_udWMLgTWQ https://www.napaonline.com/en/p/NHF65205?sr...YbiwrWusTwevSZo In the end I guess maybe there is a trade off? Additives that protect the R&P and make stuff more slippery vs what the synchro's like. The one comment back in the day that got everyone drinking the blue kool aid (sweepco 201) had to do specifically with how long the ring and pinion would last in a racecar. A racecar in where synchros are near irrelevant and putting far more stress on the diff is a lot different than a street driven 914. How often are people wearing out the ring and pinion in 914s? |
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| Superhawk996 |
Apr 11 2026, 05:27 PM
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#8
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914 Guru Group: Members Posts: 7,776 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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GL1 is not acceptable for use in a 914 differential
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| Jack Standz |
Apr 11 2026, 06:02 PM
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#9
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Senior Member Group: Members Posts: 759 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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