It's worth a shot, but if you got slippage I don't know that Lucas can help. I think that stuff is just for swelling seals, but I don't know. There's always memory making, referring back to my original post. Reverse should be a combination of high gear and low gear with one of them locking up with a band and causing some planetaries to spin different or something, I'm skeptical of the Lucas stuff. It's worth considering starting a chain of RV parks that cater to aged vehicles and guys that do their own mechanic stuff, you know for the RV crowd that's trying to only spend SOME to their kids inheritance.
Nah Lucas isn't for swelling seals, I don't think. The one of the big blurbs on the product is "stops slip". I think it's just a thickener, like their oil additive, just less sticky and gooey. It's not cold here (mid 40s at night) so I doubt it'll have a problem getting too cold/thick.
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I know it won't magically repair it, the trans is done for. I've known that for a long time really. I should have rebuilt it at a less bad time I guess but it wasn't slipping bad until this month, so yeah. As it is right now, it could last 100 miles, it could last 1,000. Who knows? But if I can help ensure it lasts about another 100 miles without it totally dying and ruining hard parts internally, the $14 for Lucas will be worth it. I'll stay out of third and reverse as much as I can, so maybe it'll survive if it's a clutch pack issue rather than a fluid pressure one.