1983 Seville (HT4100 / 3254L) gear ratio
 

Hi everyone,

I ma investigating some potential transmission problem.
I have the feeling that the 4th gear does not engage on the 3254-L
I have changed the 4th gear pressure switch and it show pressure on the 4th circuit.
I have changed the TCC Solenoid and it is in good working order now, locking the TC as it should.
I have cleaned the valve body and valves.

Best way to find out will be to do the math and monitor engine RPM/Speed
Shop manual and TH325-4L does not give gear ratio .
What i found on the internet :
1st : 2.74:1
2nd : 1.57:1
3rd : 1:1
4th : 0.7:1
tc lock : ??

the Diff seems to be 3.15 : 1 from the stamped numbers .
this give a total ratio of :

1st : 5.89 : 1
2nd : 4.72:1
3rd 4.15:1
4th : 3.85:1

From this I was able to determinate RPM/Car speed relationship.
But I am not too sure about the numbers i get from the internet.
Not sure either of the impact of the TC lock on the RPM/Speed ratio either

Anyone to confirm ? or to provide an Engine RPM/MPH charts ?

Many thanks & best regards