Something isn't right...either your tach is off or your gearing assumption is wrong. The H55f has a 5th gear of .845 and your tire height is 33". These are the known facts. The unknown is the gearing at this point. I wasn't aware that you could get a 3.8 ring/pinion, but if that is possible your RPM's would be 1945 at 60mph.
If your RPM is, in fact, accurate, that would mean your gearing is closer to 5.8 (and I don't know if that's possible either).
Well I’m only confirming on the invoice from the guys that installed. Doesn’t make sense, “they” claims do to the diesel/manual combo that it’s the nature of the beast. Not agreeing with that theroy. Cover off is the only real way to determine what’s inside. Thanks for all the input. Thoughts on what’s the proper gearing? 410’s ? Looking for highway cruising.
I have an H55 trans. The engine is from overseas out of a 95 LC. I can’t rule out the tach as they did use a tach coverter and that could be the culprit. I’ll have to dig and see where the signal is coming from.