Gearing (ratios) with Auto's in Zooks??

[Remydog05]

Gidday All,

Ive read plenty of info on what gearing everyone uses and like with Manual 5spd in Zooks but what Transfer and Diff Ratios do the people who run with AW4 auto Trans (or others)??

Im thinking 33's, Diffs 4.6, Trans 4.1, Auto AW4, would be great. (this will be for a road registered zook)
I tend to think 4.9 Trans would be too low and 6.5 would be way too low!

[Guy]

Gidday All,

Ive read plenty of info on what gearing everyone uses and like with Manual 5spd in Zooks but what Transfer and Diff Ratios do the people who run with AW4 auto Trans (or others)??

Im thinking 33's, Diffs 4.6, Trans 4.1, Auto AW4, would be great. (this will be for a road registered zook)
I tend to think 4.9 Trans would be too low and 6.5 would be way too low!

Road reg on 33's .. dont think so unfortuantely.
The little motors like to rev .. let em.. peak torque is not until the high 4000rpm area from memory
With your auto it needs gearing to work effectively .. I would at least be looking at the 4.16 tacse (strength on these gears can be hit and miss) I would most likley opt for the 4.9's for there far better reputation of quality.

[dank]

he didn't say legal road registered zook.

The engine you are putting in makes some good torque down low so I wouldn't gear it like my 4age 20v that makes its power up high...4.9 tranny, 4.57 diffs, 1:1 final drive auto. 4600rpm @100km/h and loves it.

you'd probably want something like 3.9 diffs, 4.9 tranny (1.6:1 high range), 0.7:1 final drive on the AW4 (a guess) which gives around 107km/h @ 3000rpm. This will give you a crawl ratio of around 60:1 which is acceptable for vic (based on 3.1:1 first gear guess)

Going to 4.6:1 diffs will get you at 91km/h @ 3000rpm...and crawl of 70:1 (based on 3.1:1 first gear just a guess)

60-70:1 crawl with an auto is pretty good as the torque converter offers some reduction as well...

[Gwagensteve]

I think your numbers sound OK. I get 54.6 crawl, pretty sweet with the high stall ratio on an AW-4, and you'll be cruising at 3500rpm.

I'd run it.

Steve.

[Highway-Star]

OK, I'm not totally sure on gearing an auto myself.
I really think the stock revs of 3500rpm for G engines is not enough, they seem to like about 3700rpm from what I have seen. Also the Suzuki Auto's have a very high overdrive

So personally I'd go for the 4.9 TC gears. It'll whack your crawl ratio up to 63:1, and your road revs up to about 3600rpm-ish.

Could probably even manage 6.5 transfer gears on the highway, but what is too low a low range in an auto???

[cj]

I've run around 60:1 with an AW4 on 31's and 32's with front and rear lockers in Vic and that was pretty good and 33's would be fine too. I wished I had the gearing when I had the 33's on.

Don't forget that you have no O/D in low so 3rd (1:1) is what the top speed in low range will be limited by if that is an issue to you.

[Gwagensteve]

Don't forget that you have no O/D in low so 3rd (1:1) is what the top speed in low range will be limited by if that is an issue to you.

My guess is that that's a result of the TCC and might be easily overcome?

Steve.

[Remydog05]

Thanks for your comments
Love mud Interesting what you say about the 4.1 being not as strong/reliable as the 4.9, I havent heard that before.
DanK the reason for getting away from the 3.9's was to share the load across the driveline with 4.6diff and 4.1 trans. i was thinking that it would be more reliable that way.
More info for all, the motor will be a J20a so bit more grunt than G16b. Lockright rear, airlocker front, WT diffs with NT spacing, in a LWB.

I have Chimpboys gear Ratio calculator (not sure how accurate it is)and the numbers I get is.

4.1 trans
j20a & aw4, sierra trans 4.1, diffs 4.6, 33's offroad(31 onroad) = final crawl 55.1 & 3200rpm@100klms

4.9 trans
j20a & aw4, sierra trans 4.9, diffs 4.6, 33's offroad(31 onroad) = final crawl 63.4 & 3300rpm@100klms

I think high range will be so close its not worth worry about, but low range Im thinking that the 4.9 might be getting a bit low? Also adding CJ coment about the TCC not letting OD come on in low range would also make a difference. But wouldnt the Auto/TCC not now when its in low range because its in a sierra transfer not the Vit transfer?

The other way I was thinking would be 4.1 trans and go 4.88diffs.
This way would be crawl 58.4 and 3350rpm@99.6klm, this might be getting a good option?

Of course ive been able to find a set of 4.88 diff gears and 4.3's but no 4.6 so far! I have a set of 5.12 if anyone has 4.6's they want to swap. 9 i think they would be getting too low and boarding on weaker than 4.6.

[cj]

Don't forget that you have no O/D in low so 3rd (1:1) is what the top speed in low range will be limited by if that is an issue to you.

My guess is that that's a result of the TCC and might be easily overcome?

Steve.

I had a look at this sometime back and it can be overcome and would be fine (I think) for running between technical sections but I wouldn't want to overload it, especially with crawler gears on the hard stuff not that you are ever likely to be in O/D low on the hard stuff anyway.

[joeblow]

Don't forget that you have no O/D in low so 3rd (1:1) is what the top speed in low range will be limited by if that is an issue to you.

My guess is that that's a result of the TCC and might be easily overcome?

Steve.

I had a look at this sometime back and it can be overcome and would be fine (I think) for running between technical sections but I wouldn't want to overload it, especially with crawler gears on the hard stuff not that you are ever likely to be in O/D low on the hard stuff anyway.

if all that gear is going into a sierra you will have overdrive in low as the sierra t/case does not have a low range switch, and if it aint hooked up you will have o/d in low on a sierra. i do.

[Remydog05]

Thanks for your coments

There must be a few people using an AW4 on this site somewhere??
What gearing are you using?

[V.W.Dave]

Hey joe, how much trans tunnel work did you have to do to get your auto to fit?
What exactly do you have anyway?
I currently dont have a body lift, but have a just cruzen 2" sitting in my shed ready to go in.
Do you have any pictures?
Did you have to get a custom jack shaft made up?
Did you use the vitara transfer or did you take it off and just use a leafy case?

[WRXZook]

Thanks for your coments

There must be a few people using an AW4 on this site somewhere??
What gearing are you using?

Vitara 5.12 diffs, series 1 gears, 35's, AW4.

[A1]

AW4 - 5.1's - 5.29's - 40"s

Not Quite Road driven these days though!

[Remydog05]

A1 would would you think it would do at 100klms? (Prob near redline LOL!) WRX how do you find your set up for on road use?

What would you both run if you had to drive yours on road often and run 33's or even 32's.

[WRXZook]

Ha, except for a few quick laps around the block after dark, I have only had it on a road once. That was on a good gravel road and it cruised along nicely at 100kph, can't remember what rpms it was doing, but it definitely wasn't gasping for breath. Steve (the previous owner and builder) has told me he had it to 140 on the highway. I have a car trailer, so haven't tried to re-register it. It does crawl really nice. For me, there is nothing I would change in this combination of tyres, gearing, engine and auto. Not sure what it would be like in the type of driving you do in Victoria but it is great for Menai type driving, which is where it has been used most over the years.

Look forward to seeing what you go with and a build thread.

[Remydog05]

Thanks mate

Anyone got any opinion's on a strength of a rocklobster, and what would you pay for one 2nd hand?

Joe it would be great to hear what you think about the questions asked.

[joeblow]

Hey joe, how much trans tunnel work did you have to do to get your auto to fit?
What exactly do you have anyway?
I currently dont have a body lift, but have a just cruzen 2" sitting in my shed ready to go in.
Do you have any pictures?
Did you have to get a custom jack shaft made up?
Did you use the vitara transfer or did you take it off and just use a leafy case?

a little work with a good quality hammer and knowing where to start the stretch. in the end not that much of a stretch. the hardest part is the cut to get the t/bar to sit in the right spot.

1.6, 4 speed auto and dual transfers (standard geared cases).

a body lift will make the driveline fit better.

http://www.auszookers.com/index.php?nam ... llow+thing

if you just use the auto you will need a custom jackshaft, and if using low range gearsets in just the sierra case than make sure your mounts are substantial. a short shaft and low geared t/case is not the best combo on standard mounts. you DON'T need to move the t/case back when using only the one transfer.

[Remydog05]

"a little work with a good quality hammer and knowing where to start the stretch. in the end not that much of a stretch."

Thanks Joe anymore info on the above?

Ive got a body lift and will be using 1 Transfercase.

Any thoughts on the gearing Ive put forward? Can you supply the Auto Trans adpator & Bearing, etc?

Anyone know of where there is some 4.6's for sale or swap for 5.12's?