Northcoast300h
Active Member
Transmissions have freaked me out ever since I was 16yrs old and tried fixing one on a trashed 1967 Olds Demont 88. After about a year, I never got it back together and junked the car. I've been restoring a 1970 300 Hurst I got from a junkyard in 2001. I put about 500 miles per yr on it. Trans probably is original and has 150K on it. When I got it running in 2003, I replaced all the fluids/filters and was surprised trans doesn't leak, especially for sitting in a field for 10yrs. The only problems I have with it are minor. If it sits for more than 2 days, I have to rev it up to about 2000 rpm for about 5 seconds for it to move in reverse. After that, reverse is fine unless it sits for more than 2 days. It shifts fine except it'll usually stay in second gear for what I think is too long, when I'm driving 35mph. I usually speed up to 40 so it shifts into 3rd gear, then slow down. If I stomp on it, it won't downshift the first time, but it usually will after that. I've played with the downshift linkage but didn't help. There's been no weird noises or any vibrating. I used ATF+4. Years later I tried adding Lucas trans slip but I didn't use too much since I was afraid. There was no difference. If I adjust the bands (tighten til snug, then back off 7 turns on both bands), will these problems go away? If not, how many turns should I adjust? Since its been almost 20yrs (10K miles) since last trans fluid change, This time, I'd like to try mostly ATF+4, 1 bottle of Type F and half bottle of the Lucas...yes all bottles not opened but 20yrs old). I believe all of these are compatible. Mistake or OK? Thanks