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The 60a is not considered as dependable because it has brushes and a regulator that has a high failure rate, if you go with the custom install as TOBASH recommends the tack will not work. Also the 12V issue for the trans.

One thing to consider is when they put that alternator in OD they did not intend for someone to be driving that truck at highway speeds, when you are driving at 3000RPM that alternator is turning as if you were driving at around 4000RPM, the alternator was not designed for that type of...

There is no reason not to get the larger pulley, no need to have to calculate in your head while driving. There is no need to have that much current at idle and driving the alternator at it's "correct" speed will save wear on the belt, the alternator AND consume less power,,, WIN, WIN, WIN!!!

If you do have the crank sensor, and wanted something permanent you could look for a programmable tach, one that would work with an inductive pickup and can be programmed for 4 pulses per crankshaft revolution.

Yes just get a "photo tachometer" over 1000 on fleabay alone, you stick a piece of reflective tape on the crank pulley and presto it gives you the RPM. I should not have to say this, nothing to do with you but this is America so BE CAREFUL do NOT do anything STUPID, do not put the tach in your...

OK what if he does not have a Tech II to read it with? BTW that is an inductive pickup and it runs 4X crankshaft speed. All he needs is a pulley to fix his tach issue easy pleasy fix, RWH has pointed that out,, then he can tell if the trans is acting correctly or not.

Just put he hammer down, the IP has a governor and should not let it blow up!!! At least not right away!

What is telling you you are red lining it?? unless it really jumps when you put it in gear it probably is not idling at 950RPM, looks like a small pulley to me. If it is the tach that is telling you it is red lining it than it is probably the SAME issue.

What is the highest RPM that you have seen?

If you unplug the TPS the transmission should go into limp mode, I think on the 4L it is second gear, maybe third. I doubt VERY seriously anyone changed the diff gears, should be 3.08 already the highest ratio installed in the HMMWV (the "street" would call this the lowest gears)