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I have a 1990 with an M-47. I was reading all of the hype about Redline MTL. I went to the site and found this...
"MTL is not designed for use in rear-wheel drive differentials. Those generally require a GL-5 lubricant such as Red Line 75W90 Gear Oil."
http://www.redlineoil.com/frames/mtlti.htm
(look at bottom of page)
What is the deal, which is really the best choice? I am due to change my fluid soon. One time I tried Mobil 1 synthetic ATF- it was way too slippery and I would miss shifts. I put in Castrol ATF, it seems fine. I was going to use the Redline this time, but now what? What do you recommend and why?
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1990 240- 245K- Original Owner-M-47, VX cam, IPD sprt springs, bilstiens, spt exh, euro lamps-turbo whls,- still slow but handles well- Near Houston
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