But will it clog the interior oil ways in the gear shafts? This would be really interesting to know. LWSP will almost certainly reduce the roll-over gear clatter which affects our five speed boxes during engine braking. The result was bearing failure inside the the gear shaft.Īnd this is why I am so keen to know if anyone had torn down a gear box which had been used with LWSP for a significant period of time. Perhaps a heavy weight shock proof oil was used. While this is truly an excellent product, it has been found that the heavy Teflon-like particles are quickly centrifuged out of the oil and will build up inside the center diff housing and around the synchronizers and inside of the gearshafts."Īpparently, there are instances in which the particulates in a Shockproof oil have clogged the oil passages inside of the gear shafts blocking oil flow and causing lubrication starvation. "There are concerns about using REDLINE SHOCKPROOF type gear oils inside manual transmissions. There are photographs of this kind of thing scattered around the internet.Ĭonsider for instance, the following from a speed shop in Kalamazoo Michigan: My concern about LWSP in the 5 speed transmission is that the particles of solid lubricant may clog the roller bearings inside of the gear shafts. And gear roll-over clatter is an impact problem. LWSP was developed for dog-ring transmissions to cushion the impact during shifting. The invention of an oil which is as thick between contact surfaces as a 75W140 and is as loose in the sump as the Motorcraft transmission fluid is potentially a really good solution to the gear roll over problem. For those of us who drive in the mountains, where we are engine braking about half of the time, you add as much 75W140 as you feel you can tolerate in terms of shifting effort, and call it good. When you do this shifting is more effortful, however the noise really does go down in volume. In older gearboxes where the noise is a nuisance, or where there is a concern that the repeated impact will cause localized work hardening or 'brinnelling' of the gear tooth face and eventual failure, Redline recommends adding a thick oil like their 75W140 to the MT90 in an increasing ratio until the noise is damped to an acceptable level. With Redline MT90 the gear box is quieter. When you use a lightweight oil like the Motorcraft, the gear clatter becomes quite loud. The source of this noise is from the un-driven gears on the output shaft going into resonance with their partners on the counter shaft. This pronounced clatter becomes very audible during light engine braking, and a very great deal has been written about it. Miata 5 speed transmissions do produce an unusual amount of gear 'roll-over' noise. If you did not think that your healthy NA6 differential was producing audible noise, install LWSP and take it for a drive. The NA6 differential is noticeably quieter when you use LWSP. In an application like the the little 6" NA6 differential, Light Weight Shockproof (LWSP) is a really good idea because these differentials are slightly undersized, and anything you can do to reduce tooth to tooth impact acts in the right direction. In the sump of your transmission it is as loose as motor oil. In contact surfaces between metal parts the oil is as thick as a grease. Shockproof oil behaves in a completely anomalous fashion. The film thickness of a Shockproof oil is simply huge in a gear oil which pours like a 30W motor oil. Redline Shockproof oils are the first fundamentally new gear oil chemistry since the commercial introduction of synthetic oils themselves in the early 1970's. Sorry for the multiple queries, but I am really interested in the the Shock Proof oils. We haven’t had to tear down a gearbox that’s had it in it so no experience there. We’ve been mixing it in equal parts with MTL for years in high HP applications with no apparent adverse effects. You sent us emails, you put this question in a review on our website - I'm finding it all over the place. Do not use if you have a transmission cooler." "For best results, we recommend mixing it 50-50 with Redline MTL or MT-90. It has a film thickness like a 75W140, but the viscosity of an 80W." This is some odd stuff that adheres really well to gear teeth and cushions them against high pressures. I have long thought that Redline Lightweight Shockproof might cure the gear over-run clatter which our five speeds have during mild engine braking, but have never dared to try it. I wonder how much experience they have with this. I have been using Redline Lightweight Shockproof for a while now in an NA6 differential, which has the little 6" ring gear, and the differential runs noticeably quieter. The folks at Flyin Miata now recommend Redline Lightweight Shockproof for use in your gearbox, in a 50/50 mix with Redline MTL.
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