hey everyone, I had a question for anyone who knows transmissions

in my little world of 1/10th scale enthusiast remote control monster trucks you can tweak your truck by modifying the gearing in the transmission, or the slipper clutch gear which connects to the clutch bell gear which pumps out the power running off the max 50,000RPM 2-stroke piston engine running on 33% nitro.

now, what would it entail changing out the gearing on the 5th gear of the transmission? I'm sure they're all seperate gears because of the gear ratios, and I would really, really like to have higher gearing in 5th gear because I barely use it unless I'm on a highway, most of the time I'm doing 50-60mph in 4th at 2.5-3krpms so I'm not too worried about gas mileage seeming how that'd mean I'm speeding.

but it really, really aggravates me that the entire time on the highways around here even the slow lanes do 80mph and no matter what people say you're a hazard if you do 55-65 (speed limit) and when you're doing 75-80mph in 5th you're at over 3.5krpms... that's crazy

so what I'm saying is.... is there a way to get higher gearing so I could say, shift at 4krpms in fourth at about 65-70mph into fifth and it'd drop to about 2750-3krpms at 80mph or so?

I'm not saying going through the hell of trying to add a 6th gear, I'd have to change the entire gear box and the shifter and everything, I'm saying - add more teeth to the 5th gear = higher gearing = possible?

cracking the case on the transmission and changing one gear certainly doesn't sound too difficult, but it would probably throw off the rest of the gears, but I have no idea what I'm talking about so I'll just stop now before I look any stupid-der *wipes away dribble*

 

you can get a custom made transmission with shorter gearing. expect it to be about $4k. unless there is another toyota transmission with better ratio's that can be applied...

 

i feel the same way too, i wish there were other toyota transmissions out there, maybe the same family as this one, just with higher gears. Then, we could get the replacement parts for the 5th gear (shift fork, synchro, input output gears) and replace it. The camry has the same tranny as us, possibly the rav4 manual too, but they just have higher final gear ratios (the differential ring and pinion gear ratio is higher, the 1-5 gears mite be the same) I was looking at the service manual, the fifth gear accessible wo/ opening up the entire tranny, just taking off the 5th gear cover. Go here to see the rebuild of a toyora corolla tranny which shows the accesibility of the 5th gear

http://www.ae92gts.com/ae92gts_trans_rb_2.html

however, the expense of this, (hundreds for parts and your labor or shop labor) probably won't be offset by the gas you save or the engine wear you save from revving less at freeway speeds, plus its cool to be able to smash in 5th and still pass and like go up hills.
(also, do you or anyone else hear noticebly more gear whine in first gear especially during decceleration or coasting while engaged in first)[/url]

 

I notice the gear wine and love it. My evo did that haha. Sounds like a weak supercharger haha. But yeah, they tuned the gears for a reason. They felt it was optimal at the time for both power and efficiency.

My suggestion is to just change the final drive ratio. That will make all your gears slightly longer. Thing is, better buy a speed cut defense system so you can go faster than 130 (for race use of course), because the longer gearing is only going to hurt you in performance if you still max out at the same speed.