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Okay, I'm sure that this isn't a total secret, but I'm willing to bet 95% have never heard this one.Here's the deal, you can put a 74 260 4 speed trans. input shaft and front countershaft gear on an 81-83 5 speed and get some killer low end acceleration .The stock ratios are as follows. 3.06 1.858 1.308 1.00 .745 MODIFIED Ratios 3.70 2.245 1.58 1.00 .8326 You run hard out of the hole with this setup but you do have a less than perfect gap on the 3rd to 4th shift.However I think this is akiller setup for autocrossers where speed doesnt go over 75, that is when you have to shift if you are running a 3.9 and 195/60 14 tires(If you shift at 7800 rpm).I liked this for 1/8 mi. drags, but unfortunately I had to shift to 4th gear about 90 ft from finish line and I didnt like the possibility of a missed shift costing me a race.However this would be great combo for someone with less hp because they would cross finsh line in 3rd gear. Okay, the next setup is what I am currently running in my 240 .This setup works better for 1/4 mile drags because the 3rd to 4th gear gap is better.Take an input shaft and front countershaft gear from a79 5 speed and put it on the 81-83 5speed and you get this setup.

3.42 2.07 1.46 1.00 .8326 Either of these setups really improves the drivability of any Z car and would really help accelerate a heavy 280 zx off the line without having to resort to a high rpm clutch drop to spin the tires up to the engines powerband. The last combo is this one. .Take the 81-83 input shaft and cs gear and put them on a 79 5 speed and you get this setup 2.98 1.85 1.17 1.00 .77 I guess this would work well with a4.11 to 4.44 rear diff and would give an ultra close shift from 3rd to 4th.I have not tried this combo yet. If you drag race and dont run slicks or street legal drag tires you will not reap the full benefits with the first two optional tranny combos.Good 60 ft times are essential to quick e.t.s and the first setup works terrific with stcky tires.I managed a 1.84 sec 60 ft with Nitto street drag slicks.This was done with an open 3.9 diff and the nittos spun hard off the line.With real good slicks and lmited slip rear I am positive low 1.70 sec 60 ft times are possible. If anyone out there knew about this let me know. Because it took me 9 yrs of zzzing before it dawned on me!!!!
 

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Discussion Starter #2
Left one out ,79 with 74 input

You can also put 79 tranny with 74 input shaft and cs gear for these ratios 3.59 2.245 1.415 1.00 .934 Dont know if you all could care less, but I thoght I try to cover em all. > Okay, I'm sure that this isn't a total
> secret, but I'm willing to bet 95% have
> never heard this one.Here's the deal, you
> can put a 74 260 4 speed trans. input shaft
> and front countershaft gear on an 81-83 5
> speed and get some killer low end
> acceleration .The stock ratios are as
> follows. 3.06 1.858 1.308 1.00 .745 MODIFIED
> Ratios 3.70 2.245 1.58 1.00 .8326 You run
> hard out of the hole with this setup but you
> do have a less than perfect gap on the 3rd
> to 4th shift.However I think this is akiller
> setup for autocrossers where speed doesnt go
> over 75, that is when you have to shift if
> you are running a 3.9 and 195/60 14 tires(If
> you shift at 7800 rpm).I liked this for 1/8
> mi. drags, but unfortunately I had to shift
> to 4th gear about 90 ft from finish line and
> I didnt like the possibility of a missed
> shift costing me a race.However this would
> be great combo for someone with less hp
> because they would cross finsh line in 3rd
> gear. Okay, the next setup is what I am
> currently running in my 240 .This setup
> works better for 1/4 mile drags because the
> 3rd to 4th gear gap is better.Take an input
> shaft and front countershaft gear from a79 5
> speed and put it on the 81-83 5speed and you
> get this setup.

> 3.42 2.07 1.46 1.00 .8326 Either of these
> setups really improves the drivability of
> any Z car and would really help accelerate a
> heavy 280 zx off the line without having to
> resort to a high rpm clutch drop to spin the
> tires up to the engines powerband. The last
> combo is this one. .Take the 81-83 input
> shaft and cs gear and put them on a 79 5
> speed and you get this setup 2.98 1.85 1.17
> 1.00 .77 I guess this would work well with
> a4.11 to 4.44 rear diff and would give an
> ultra close shift from 3rd to 4th.I have not
> tried this combo yet. If you drag race and
> dont run slicks or street legal drag tires
> you will not reap the full benefits with the
> first two optional tranny combos.Good 60 ft
> times are essential to quick e.t.s and the
> first setup works terrific with stcky
> tires.I managed a 1.84 sec 60 ft with Nitto
> street drag slicks.This was done with an
> open 3.9 diff and the nittos spun hard off
> the line.With real good slicks and lmited
> slip rear I am positive low 1.70 sec 60 ft
> times are possible. If anyone out there knew
> about this let me know. Because it took me 9
> yrs of zzzing before it dawned on me!!!!
 

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CORRECTION!! The first tranny has a ,90

The first modified tranny listed in the first post should be .90 overdrive not .83 SORRY about the typo!!!

Later,norm
 
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