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In general, GL4 lube for manual trannys, GL5 for rear differentials

Another A855 owner who disagrees that it is a pile of crap. I was #4 on Jamie's list and got mine in Nov 2013. It is behind a slightly modified 6.1 Hemi in a '69 Cuda convertible. Did have some minor grinding shifting into 3rd gear when cold, then changed oil from the incorrect GL-5 to the...

Based on my e-mail discussions with Bill Fuss of GFI back in early 2018, I questioned why they were specifying a GL5 lube - which is used in differentials. It seemed they were just following recommendations from Lucas to use a GL5 (differential )lube. After I pointed out that a GL4...

If you have a really high HP engine, then you may need a 75w140 oil, but I’m not sure who makes it in a GL4 tranny oil

Jamie has had a terrible time since he started this project with parts supplier problems. Sadly these are all US suppliers.

The video focuses on viscosity but doesn't talk about characteristics of friction additives. Also, Jamie's A-855 tranny uses carbon fibre blocker rings as opposed to older style brass rings.

I used synthetic. Manual Transmission & Transaxle Gear Lube 75W-90 I've had the car out again for several short drives and the gear clashing is definitely gone. Seems like Passon got some bad advice from Lucas about what type of oil to use. Based on my research and experience - do NOT use a GL5...

I've had the Cuda out for a short drive after changing the tranny lube from a 75w140 GL5 to a 75w90 GL4 transmission oil. The clashing is virtually gone. I need to drive it some more under different conditions to ensure that has solved the clashing problem. I have not added the "Lube Gard"...

Hi Roger I haven't had the car out yet after changing to 75w90 GL4. (This is not California weather up here in the great white north!!!!) I'm going to drive it without the additive first and see how it shifts. If it still clashes, then I'll add the Lube Gard. I've left room to add the whole...

Has anyone had gear clashing when shifting gears? What kind of gear lube are you using? I've had some clashing when shifting into 3rd gear on my A855. I was initially using a 75w90 GL5 gear oil. Then I got a note from Jamie saying to use 75w140 GL5 and after changing I got some clashing going...

I finally got my 6.1 L Hemi Cuda project finished this year and have about 600 miles on the 5 speed. So far, very happy with the tranny (and the Hemi!!!) Jim.

Jamie did all his testing with synthetic.

Got mine in November. I was # 4 on the list

I checked the radial and axial runout on a SB bellhousing that I'm bolting to a 6.1 L hemi. It was way off the max specs. My advice - ALWAYS check the alignment.