727 Transmission?
#21
Er uh, hmmm..
Are there options for the 727 in terms of gear ratios and planetary gears that don't exist for A518's?
It's been my longstanding contention that our transmissions short falls in performance is more akin to the silly selection of ratios than anything.. I'd love to see a lower first and second and a wider gap to third.. or, maybe not even a wider gap if the first and second were a little lower.. you know, like a 350 or a 400..
Are there options for the 727 in terms of gear ratios and planetary gears that don't exist for A518's?
It's been my longstanding contention that our transmissions short falls in performance is more akin to the silly selection of ratios than anything.. I'd love to see a lower first and second and a wider gap to third.. or, maybe not even a wider gap if the first and second were a little lower.. you know, like a 350 or a 400..
TH350
2.52:1
1.52:1
1:1
C6
2.46
1.46
1:1
A727 (A518 also, OD is 0.69)
2.45
1.45
1:1
There really is not a noticeable difference in gear ratios from any manufacturer. Gaps are all essentially the same.
Anyway I would be very surprised if the A727 and A518 planetaries were not interchangeable. They look identical. Look them up on PATC and see if the part #'s are the same.
#22
I'm not an expert on anything, and the mysteries in that transmission casing are just that.. but..
that planetary and supporting cast is responsible for varying gearing possibilities.. for instance, our rigs have seven different ratios.. first gear may be x, then shift to second gear, but when it goes back to first, it may be one of two ratio's.. I've no clue under the sun how this works, but the planetary has something to do with it.. well, the planetary and the sun.. no pun intended..
so, moving to a device that offers MORE planetary gears offers MORE possible ratio's, right? am I wrong? how the hell does this work? at some point you lose strength because of diminishing material for each planetary, but where is that cut off? is this the reason for the legendary strength of the 727?
that planetary and supporting cast is responsible for varying gearing possibilities.. for instance, our rigs have seven different ratios.. first gear may be x, then shift to second gear, but when it goes back to first, it may be one of two ratio's.. I've no clue under the sun how this works, but the planetary has something to do with it.. well, the planetary and the sun.. no pun intended..
so, moving to a device that offers MORE planetary gears offers MORE possible ratio's, right? am I wrong? how the hell does this work? at some point you lose strength because of diminishing material for each planetary, but where is that cut off? is this the reason for the legendary strength of the 727?
#23
It's the size of the gears that determines ratio. More planet gears make the unit stronger. (we have four planet gears in ours, you can get five, or even six planet gears to put in instead. same gear ratio.) there are also some optional ratios available...... Lower first/second gears. I think we had someone on here that was doing trans gears, instead of regearing the axles for larger tires.
#24
I used this to get an idea of how the planetary gears work.
http://auto.howstuffworks.com/automa...ansmission.htm
http://auto.howstuffworks.com/automa...ansmission.htm
#25