What gears with with 35" tires?

[fulsizjeep]

I would think it'd be a matter of the auto slush and using a liquid filled torque converter, vs a static unvarying load on a gear driven stick transmission.

It depends on the condition of the clutch & pressure plate on the manual and the overall condition of the auto tranny. I gained about 1.7 mpg when I put the rebuilt 727 in my GW. Is there an option to select worn out 727?

[CutterN55]

That sounds wrong. The non-lockup torque converter will mean slightly higher rpms than the manual, if anything. If the calculator isn't sophisticated enough to consider/predict torque converter slip then they should be exactly the same.

Hey I switched the RPMs with the 727 and the T18. Had a rough few days.
The T18 was showing 2550 and the 727 showed 2700 at 65mph with the same data.
I used the Grimmjeeper calculator and here was my inputs...

727
NP229
4.10's
35's

T18
NP208
4.10's
35's

Both T-cases have same Lo ratio's I think... 2.61

The T-18 is lower by a little under 200 RPM's at 65, but I'm still not sure why if they both have a 1.0 ratio at final drive gear. Maybe it's the torque converter like you said.

[jeeping1974]

One thing I'm surprised nobody asked including me (Unless I over looked it) is what is the vehicle going to be used for?

Obviously on-road, but how much off-road are you going to be doing and is it just Class VI roads or something more challenging? Are you planning to go out once a month? Every weekend? Once In a while?

Why not same up for a underdrive unit (i.e. Black Box, Klune, etc.) then you can keep your gears for the street and still have plenty of gearing for off-road.

[srobertsfsj]

50/50 on/off-road, snow and ice on-road in the winter. I like to drive to the closer trails but will trailer on the long haul trips (Ouray, Moab, New Mexico). I use to like to try the tougher trails but I am getting tired of tearing everything up so I usually do 8 out of 10 or below rated trails.

[will e]

50/50 on/off-road, snow and ice on-road in the winter. I like to drive to the closer trails but will trailer on the long haul trips (Ouray, Moab, New Mexico). I use to like to try the tougher trails but I am getting tired of tearing everything up so I usually do 8 out of 10 or below rated trails.

I double my vote for 4.56

[shimniok]

The T-18 is lower by a little under 200 RPM's at 65, but I'm still not sure why if they both have a 1.0 ratio at final drive gear. Maybe it's the torque converter like you said.

That's the only thing that would make sense. And that's also pretty close to what I see on mine (727) altho I have a low stall converter so it is a little tighter. I am at ~ 2600 @ 65.

[jeeping1974]

50/50 on/off-road, snow and ice on-road in the winter. I like to drive to the closer trails but will trailer on the long haul trips (Ouray, Moab, New Mexico). I use to like to try the tougher trails but I am getting tired of tearing everything up so I usually do 8 out of 10 or below rated trails.

If you trust your FSJ to make the longer trips, 4.10 gears (maybe even 3.92 gears) and an underdrive unit or doubler would be great then. I know it's more money overall, but just some food for thought.

[Blake]

I used to have a Scout II that was running 33's on the stock d44's with 4:10's. Stock 727.

It was geared to low on the hwy. Hwy speeds kinda sucked. Low range sucked as well because the crappy D20 'case only had a 2:1.

I think you should run some "thick" 4:10 gears in your stock axles on 35's.

[68_Gladiator]

is this all based on stock motors? ill be running 4.10's and 35's but my motor has 450 flywheel hp estimated 350-385 wrhp. will be a 50/50 on/off road daily driver. not trying to jack the thread

[AlsChopShop]

because it will see the road, go with 4.10s. more options that way in used axles, too.

Al

[Hippie Metal]

Thread Hi-Jack

I was just wondering the same thing to myself. I am running a Ford T-18/Twin stick 205 behind a sound running 360 in a 1984 GW


/Thread Hi-Jack

[dblankenbaker]

if i remember right my 90 gw came with 2.72. yuck!

i went with 3.31 and run 35's most of the time.

i like it well enough for most situations...but sure wish i'd put in a lower gear when i pull my 4-lo lever.

I just picked up an '89 Waggy running 36's. The PO didn't know what gears were in it. Checked the gears and they are... 3.31's. Interestingly, that is comparable to running 2.73's w/29" tires.

Power is adequate around town and on the Interstate. I certainly don't want a hot rod that will out accellerate it's ability to stop.

[will e]

Hey Dbblankenbaker... welcome to the forum from another 'valley of the sun' member.

[srobertsfsj]

I'm glad someone brought this thread back to life. I wanted to give everyone an update. I did end up going with 4.56's and for wheeling it was awesome! Felt like I had a ton of power.

BUT, what I found is that it was completely un-driveable on the highway. At 65mph I was doing 3200rpm and it was just too much. The engine temp would creep up. That being said I went back to 4.10's and I am liking it much better now. It doesnt feel like I am going to blow up the engine when running down the highway. Its also nice having an accurate speedo.

[derf]

Since I posted in this thread, I found some J20 axles and swapped them in with 4.56 gears and 35" tires. It does scream on the freeway too much. But I also have a 700R4 overdrive waiting to go in this spring when the weather warms up enough to do it. So since I don't have to do any highway driving, I'm living with it as is.

If I wasn't going to go with the overdrive, I would have gone with 4.10s.