 Which Transmission Fluid, Use? Suggestions? |
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| StarBear |
 May 14 2024, 09:10 AM
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#1
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Senior Member  Group: Members Posts: 1,926 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States 
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74 1.8 with original transmission.
What is the best fluid to use - either top off or replace? It now has a Swepco, though don’t recall which one (thought I wrote it in my notes but can’t find it). A small seal leak, so like to top it off at the start of each driving season. (IMG:style_emoticons/default/driving.gif) |
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| technicalninja |
May 16 2024, 08:36 AM
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#2
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Senior Member Group: Members Posts: 1,387 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region
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QUOTE(rudedude @ May 16 2024, 08:27 AM)  I have used royal purple atf in 901/911/915 boxes since mid 70's, it was a racing trick and still never see any wear in boxes when torn down even now. I'm not the only using it but see no need for using anything else. Let the criticism start. That is a "trick" that the OEMs went to as well. A box that has been 75/90w went ATF (about Year 2000?). The T56 (6 speed LS1-2) was ATF from the start. A hot trick for the Miata 6 speed (GL4 75/90) is to use the Ford "Unicorn juice" part# XT-M5-QS This is the fluid for the Ricardo gear box in the mid 2000 Ford GT. My Miata 6 speed was SO bad I had a full-on parts list for tranny rebuild. Out of sheer desperation I tried the Ford stuff (very ATF like) and it made the overhaul unnecessary! I wouldn't change a 914 over unless I thought I was heading for a rebuild. I WOULD try the Ford fluid BEFORE I removed the transmission... |
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| Superhawk996 |
May 16 2024, 09:00 AM
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#3
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914 Guru Group: Members Posts: 5,920 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(technicalninja @ May 16 2024, 10:36 AM) QUOTE(rudedude @ May 16 2024, 08:27 AM) I have used royal purple atf in 901/911/915 boxes since mid 70's, it was a racing trick and still never see any wear in boxes when torn down even now. I'm not the only using it but see no need for using anything else. Let the criticism start. That is a "trick" that the OEMs went to as well. A box that has been 75/90w went ATF (about Year 2000?). The T56 (6 speed LS1-2) was ATF from the start. A hot trick for the Miata 6 speed (GL4 75/90) is to use the Ford "Unicorn juice" part# XT-M5-QS This is the fluid for the Ricardo gear box in the mid 2000 Ford GT. My Miata 6 speed was SO bad I had a full-on parts list for tranny rebuild. Out of sheer desperation I tried the Ford stuff (very ATF like) and it made the overhaul unnecessary! I wouldn't change a 914 over unless I thought I was heading for a rebuild. I WOULD try the Ford fluid BEFORE I removed the transmission... Beware of conflating transmissions with transaxles. They have vastly different lubrication needs. Transaxle with hypoid ring and pinion is GL-5. Don’t conflate FWD automatic transaxles running helical or spur gears with RWD transaxles running hypoid gearing. Spur and helical gears will be fine on ATF. Not so much for hypoid gearing with high loads and high sliding forces. Note: the mid 2000s Ford GT specifies GL-5  |
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Posts in this topic
StarBear Which Transmission Fluid May 14 2024, 09:10 AM
nditiz1 After Dr. Evils rebuild class I use 2 supertech (w... May 14 2024, 09:14 AM Superhawk996 GL-5 rating is what matters. May 14 2024, 10:19 AM dr914@autoatlanta.com 80/90. years ago quaker oil made a special vw/pors... May 14 2024, 10:24 AM bossboy302 Swepco 201 baby!!
Best I've used in 5... May 14 2024, 10:37 AM
cdn914
Swepco 201 baby!!
Best I've used in ... May 14 2024, 11:47 AM ClayPerrine I run 85/90 gear oil. I used to run Swepco, but I... May 14 2024, 10:46 AM StarBear All great advice. Thanks ever so much! :)
No... May 14 2024, 11:03 AM rjames
All great advice. Thanks ever so much! :)
N... May 14 2024, 11:29 AM NARP74 Not sure if I am proud or disappointed that no one... May 14 2024, 02:25 PM JamesM
74 1.8 with original transmission.
What is the b... May 14 2024, 03:12 PM BENBRO02
74 1.8 with original transmission.
What is the ... May 14 2024, 06:41 PM Geezer914 Kendall NS-MP GL-5 Hypoid gear oil 80W-90. Great ... May 14 2024, 04:29 PM StarBear
Kendall NS-MP GL-5 Hypoid gear oil 80W-90. Great... May 15 2024, 06:52 AM Krieger Sta Lube hypoid works great on the street and trac... May 14 2024, 10:40 PM 930cabman
Sta Lube hypoid works great on the street and tra... May 15 2024, 11:47 AM Tonyooc I use Red Line. May 15 2024, 07:09 AM Superhawk996 I use Astro Glide
:hide: May 15 2024, 07:38 AM VegasRacer Swepco leaked when I tried it in my race car. YMMV May 15 2024, 11:26 AM AZBanks Dr. Evil does not recommend Swepco. May 15 2024, 11:44 AM rudedude I have used royal purple atf in 901/911/915 boxes ... May 16 2024, 07:27 AM GregAmy Chris Foley recommends Lubrication Engineers Monol... May 16 2024, 07:33 AM Shivers Lucas 80w-90w May 16 2024, 09:52 AM technicalninja
[quote name='technicalninja' post='3145545' date=... May 16 2024, 11:04 AM Dr Evil Ah, its been a while since this was asked :)
chea... May 17 2024, 07:16 AM Root_Werks
Ah, its been a while since this was asked :)
che... May 17 2024, 12:55 PM Dr Evil
Ah, its been a while since this was asked :)
ch... May 19 2024, 06:53 PM technicalninja Just did an application search on the unicorn juic... May 17 2024, 09:27 AM Shivers I found a few write ups and everyone has an opinio... May 17 2024, 02:26 PM |
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