Subytuner
Pebble Pounder
Can anyone tell me the difference between the 65:1 and 38:1 gear box without opening them up
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Motor-gearing selection?
- Thread starter Subytuner
- Start date
The reason I say that is if you keep the servo mounted the same way. With the 38:1 cases you will not be able to run delrin tubes, which are over 1.5oz lighter than al tubes. On my 2.2 a 7950 barely fits with a 13t pinion. I can weigh both cases but i think the difference will be marginal after milling and i don't think the extra gear even weights 1/2 an ounce.
So I think you lose more with the delrin tubes than you gain in the extra gear. That was my thought anyway?
CREEPERBOB
Yashua
Two extra bearings and one extra gear and the gears in the 65:1 case do not have pins to hold the gears they have set screws holding the gears to the bearing stubs.
TURBOFEST
I wanna be Dave
Everything you're saying makes sense. As far as servo mounting...I may just not put the servo behind the tube. I have already been thinking about what to do with it. I'll probably just go back to the way I used to mount mine before the 65:1's even existed. I had a plate that mounted the servo flat on the axle tube.
The HD machined 2.2 gears are the same as the gears in the 65:1 cases in that they use the set-screws, not pins.
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TURBOFEST
I wanna be Dave
The numbers indicate the gear ratio of the gearbox. The 65:1 gearbox has an extra gear in it which reduces the gear ratio from 38:1 to 65:1.
The final gears is also different. The 38:1 gears use a 32 pitch gear and the 65:1 gears use a 48 pitch. The 1st gear in both are the same but the other two are not interchangeable. I've tried and the locker from the 65:1 cases does not fit in the 38:1 case.
Subytuner
Pebble Pounder
I understand the gear ratio difference :roll:
TURBOFEST
I wanna be Dave
:roll:??? Really? I guess judging by the question written above, we're supposed to know that???? I'm EXTREMELY sorry for having made an effort to try to answer your vague question. "thumbsup"
Erin
I wanna be Dave
So what are you wanting to know? Theres an extra gear in the 65:1's and they take 48 pitch pinions.
JeremyH
I wanna be Dave
I heard the 65:1s have room to store an apple inside just in case you need a mid-crawl snack...
ROWDY RACING
I wanna be Dave
Dammit! Just when I decided to go super XR I find out this. :evil:
Erin
I wanna be Dave
Subytuner
Pebble Pounder
Basically do they look the same on the outside ? Or is there a difference in apearance, I couldnt find a good
Side by side comparison. I understand that one has a extra gear and is stronger.
and one is pin vs bolt and is lower ratio.
Thanks, "thumbsup"
I love how this thread changed topics a couple times
Erin
I wanna be Dave
The case is longer to accomodate the extra gear, but not substantally.
Subytuner
Pebble Pounder
Erin
I wanna be Dave
What are you trying to determine? I have both cases.
Subytuner
Pebble Pounder
Whether I have a 65:1 or a 38:1 gearbox I didn't want to pull the car apart to check ,
;-)
JeremyH
I wanna be Dave
The 38:1 gearbox:
The 65:1 gearbox:
Notice the extra bearing recess in the 65:1 for the extra gear. "thumbsup"
The 65:1 gearbox:
Notice the extra bearing recess in the 65:1 for the extra gear. "thumbsup"
Those are both 38:1 cases. Silly goose!
The easiest way to tell is, if the two separate motor screw holes are on the top (like the pictures above) it's a 38:1 case. If the two holes are on the bottom and the slotted hole (one bottom hole in the above pic) is on the top, it's a 65:1 case. Also the 38:1 case uses a really long pinion and the 65:1 case uses a short normal looking pinion.
The easiest way to tell is, if the two separate motor screw holes are on the top (like the pictures above) it's a 38:1 case. If the two holes are on the bottom and the slotted hole (one bottom hole in the above pic) is on the top, it's a 65:1 case. Also the 38:1 case uses a really long pinion and the 65:1 case uses a short normal looking pinion.
Erin
I wanna be Dave
Yea those are both 38's. Theres 3 bearing pockets and the rear of 65 case is rounded. 38 case is flat as pictured.
