Gear ration question:
#1
Gear ratio question:
Originally Posted by HOZZMANRX7
1987 ASpec S4 TII 5th gear is .762:1
1988 ASpec S4 TII 5ht dear is .711:1
All ASpec S5 TII 5th gear is .719:1
Except for Infini IV's, all JSpec (Infini 2 & 3) S4 & S5 TII 5th gear is .806
Infini IV's 5th gear is .72 (.719?):1 with a 4.30 third member ratio
Now, a simple search and the very valuable information is there for all.
Thanks to all for their help and input.
1988 ASpec S4 TII 5ht dear is .711:1
All ASpec S5 TII 5th gear is .719:1
Except for Infini IV's, all JSpec (Infini 2 & 3) S4 & S5 TII 5th gear is .806
Infini IV's 5th gear is .72 (.719?):1 with a 4.30 third member ratio
Now, a simple search and the very valuable information is there for all.
Thanks to all for their help and input.
Ok, found this info regarding 5th gear ratio on various TII's trannys. I also found that Ted on FC3Spro says the 5th gear can be swapped out of FD's.
Question #1: Is the 5th gear ratio lower on the N/A and
Question #2 Can the N/A 5th gear be swapped in from the N/A to the TII tranny?
I am in the beginning of a swap Jspec S5 into S4 TII. I want the lower ratio of the Aspec, but my original tranny has lots of miles whereas the Jspec is much younger and fresher.
If I am going to swap the 5th gear anyway, I would like the even lower N/A ratio.
Is this a fit, has it ever been done?
I do lots of hiway driving and would like the lower rpm for hiway calm and also a little bump for efficiency.
Off hand, what is the revs per mile on TII Aspec vs. Jsped trannys, anyone?
thanks
edit:
Found the N/A Ratio in the FAQ. Duh. Looks like it is19'86 and 1987=.711 and 1987.5 up =.697.
Can the swap be made?
Last edited by jackhild59; 06-18-06 at 12:21 PM.
#5
If you want to change just 1 gear out of the tranny, it's not possible without really good skills in welding and cutting. You'd be better off just switching out the whole shaft or getting another tranny, OR get a new differential with different ratios.
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