This is a demonstration of the power flow through a Toyota AB60E and AB60F automatic transmission
this is a six-speed automatic transmission the AB60E is a tool drive version the AB60F is the
four-wheel-drive version this transmission can be found in 19th 2007 and above Toyota Tundras
and 2008 and above Toyota Sequoia this 6-speed automatic has three planetary gear sets down
inside of this housing here we have a front planetary gearset a center gear set and a
rear planetary gearset this transmission also has eight clutch packs four of them are called brakes
and a brake is something that's going to stop part of the planetary gearset from rotating and
those brakes are labeled down here at the bottom we have the B4 break here's the B2 here's the B1
and here's the B3 so they're not in numerical order but you have four brakes that are going
to stop components of those three planetary gear sets from rotating one or more of those
will be applied in the different gears as we move forward we also have four clutch packs that are
going to be connected to rotating parts of the planetary gearset to make them rotate to over
under or underneath this housing here we've got the C1 clutch and the C4 clutch and then two of
them spline to the outside of these two housings the C2 clutch and the C3 clutch and then we also
have forward one-way devices those devices on this transmission or actually Sprag clutches the
rotated one direction but not the other direction starting at the bottom here we have the F3 Sprag
the F1 Sprag they have two Sprag and then inside of this house and down below here is the F4 spread
so what I'm going to do is take you through each of the six forward gear ratios show you
which brakes are held which clutches are applied to get the different gears forward and then also
reverse we have the input shaft here I've got a yellow mark on the input shaft as an index
we've got the output shaft here with here with a yellow mark as an index and oh by the way down the
bottom here is our parking gear where the parking pawl is going to come in and engage and keep the
output shaft and turning to hold the vehicle when we're in park so to begin with in first gear we
have to have the C1 and the C4 clutch is applied well that's these two clutches that are in this
housing gear and so I'm going to turn the input shaft that's connected to our torque converter
the turbine and the torque converter we've got a fluid coupling to the engines crankshaft and
so we're going to turn this an input shaft and have two C1 and C foreclosures on and then we
have to have the F3 Sprag holding and the F4 Sprag holding or the F4 Sprag holding is down
inside of here you have three sprag is this big cast-iron lug housing right here so I'm going to
hang on to that we're going to have a gear ratio of 3.33 to 1 so three and a third turns to one
of the engine to the output shaft so here we go here's one turning in two turns three terms and
the third three and a third turns in to 1/3 out is our first gear ratio to shift a second gear
we're still going to keep the C1 and C 4 clutches applied and now we're going to apply the B3 break
well the B3 break is right here so I'm going to hang on to this housing and keep it from moving
let me line up our yellow marks so we can start over so now for 2nd gear we should have a gear
ratio or 1.96 to 1 so almost 2 turns the input to one turn the output here we go one turn in
almost two turns in and we've got one full turn of the output shaft so that's second gear in second
gear we also have the F1 and F2 Sprag holding and they hold during acceleration we didn't
have to do anything to those two to make them hold their mechanically engaged so now I want to go to
third gear we still keep the C1 and the C4 clutch applied in this housing but now we have to apply
the C3 clutch in in addition well the C3 clutch rotate this around is the clutch that contacts
this housing so let me get the yellow marks lined up again here there we go so I'm going to have to
turn the input shaft and the C1 to C2 clutches and the C3 clutch together while holding the
be three break which is right here and our gear ratio and third gear should be 1.353 to
1 so I'm going to try to turn this and these two at the same time but not turn this will kind of
turn on its own but we should get about one on 1/3 turns in to one turn out so here's our one turn in
and there we go or one full turn out we've got another third of a turn on the input shaft so
that's our third gear fourth gear on this transmission is direct drive where one turn
in equals one turn out and in fourth gear and the way we get fourth gear is to keep the C1
and C2 clutches apply down inside this housing but then also apply the C3 and this I'm sorry
this is the C1 and the C4 down inside of here but also apply the C3 and the C2 together so
let me line up the yellow marks we're going to turn these two housings and these two clutches
together and just by doing that you can see quite simply one turn in gave us one turn out
okay now this transmission is a six-speed we've only gone up to fourth gear 5th and 6th gears
are both overdrive so this is a double overdrive the transmission fifth gear we're going to apply
the C1 the C2 and the C3 clutches together you know to do that in this demonstration
I'm going to take this housing out because the C1 clutch is down inside of here and here's the
thousand see one clutch grabs and I'm just going to reach down inside with a little
pocket screwdriver here and we'll lock these two houses together the C 3 and the C2 clutch
housings and then our input housing with the C1 clutch would also be locked together here
so we're going to turn those three and at the same time we are going to hold the B1 break and the B3
break will be three brakes right here to be one brakes right here so I'm going to hold those and
let's see let me line the marks up
well don't have a mark on this housing so I'll just have to use my hand so we've got the yellow
mark here right here's where we're going to grab and drive for fifth gear we'll hold the B3 the
B1 and we're going to turn we should get one full turn of the output shaft which we did but
notice my hand is over here and I started here we're only three-quarters of a turn around in
on the fifth gear driving so that means we have 0.728 not quite three quarters of a turn of the
input shaft rotating and we got one full turn of the output shaft which is over there and that's
a pretty standard overdrive gear ratio for most transmissions but then this transmission has a
sixth gear which is a double overdrive and in sixth gear we're just going to apply the C to
clutch along with the C1 clutch will the C two clutch is this upper housing right here C two
clutch let me line that up with me line the sticker up with the output shaft yellow mark
so I'm going to turn the C two clutch housing and at the same time we have to have the B1 B2
and B3 brakes on so here's B1 B3 B2 hold all of those from turning and turn the C2 clutch
and our output shaft gear ratios from 0.588 so we should get just roughly half a turn of the
input to one turn of the output so here we go one turn of the output and if I turn this around half
a turn a little more than half a turn 0.588, 6/10 of a turn we had on our input which is
sixth gear okay then the last year we need to do is reverse, reverse is accomplished by turning
the C3 clutch which is this housing here and at the same time holding the B1 and the B4 brakes
B1 brake is right here B4 brake is down at the bottom so I have to hold these two and turn the
C3 clutch in this demonstration to turn that C3 clutch and then take that C2 clutch housing out
of the way let's see let me line up the yellow mark with our sticker here hold this these two
brakes from turning and we should get a reverse gear ratio of roughly three to one 3.061 to 1 so
here we go output shaft is turning backwards got one full turn in two full turns in and 3
full turns in and a tiny bit more 3.61 to 1 for the reverse gear ratio on this Toyota AB60E or
AB60F transmission this transmission is made by Aisin which is the Toyota owned company
and once again this is used in the Toyota Tundra 2007 on above and Toyota Sequoia 2008