I want to change the transmision gear oil on my truck. I want to get Red-Line gear oil, but am not sure which one to get. Do you recommend MTL or MT-90. The servive manual recommends GL-4 or GL-5 with a viscosity of SAE 80 OR 90. I called the dealer and they do not sell mopar gear lube. They wanted about $150 to change the trans oil. <img src="/forums/images/graemlins/scared.gif" alt="" /> I have a 5 speed manual. Thank you for your help.

1987 DODGE RAIDER 4X4, 2.6 LITTER, 5 SPEED MANUAL MODS+PARTS: