I went over the numbers again and I was a little high, it should have been about 4,600 RPM.
The fifth gear of 0.829 is for the 1983 with overdrive. Is that what you have?
You're also missing the secondary reduction between the transmission and engine output.
Try these numbers
Fifth X Final X Secondary
0.939 X 3.4 X 0.825 = 2.634
0.909 X 3.4 X 0.973 = 3.007
0.829 X 3.4 X 0.897 = 2.528
I have a copy of the gearing spreadsheet Steve (SuperSkypilot) made when doing the B-Girl which makes it easy to change ratios and see what happens.
Private Message me with an email address if you want a copy.
I have to admit after you posted that I had to do some research, what I found, (I admit going to one website only) was you multiply the Primary X the Secondary X the Gear x the Rear end / final drive ratio
At first these numbers seemed wrong BIG TIME then I thought about it a 3.08 rear gear in a car last I remember was no where NEAR 4K rpm at 70 so I started playing with it.... yea these numbers make more sense for the GW to be turning the RPM it does with the final drive it has.
Primary reduction ratio: 1.708
Secondary reduction ratio: 0.825
First gear ratio: 2.500
Second gear ratio: 1.708
Third gear ratio: 1.333
Fourth gear ratio: 1.097
Fifth gear ratio: 0.939
Final reduction ratio: 3.400
1.708 x .825 x .939 =
x 3.4 = 4.5
which seems to corrilate to my RPM rather close at 70MPH with a 25.8 " (calculated) tire Dia
68mph at 4K vs 65 at 4K calculated
so yea it will be higher thanks for the info I learned something.
and found out something I DIDNT WANT TO KNOW