SY Transfercase

[MIXEDBREED]

What are the part numbers for the syclone TC. I am trying to buy a new one but dont know which one is for the syclone. I know the ty;s have a different part number/ model number then the syclones but not sure which one is which. I think one is 27 spline and the other is 32 but not sure.

 

[TxSy1430]

Re: SY Transfercase

check these guys out.


http://racetransmissions.com/store/index.php/cPath/304_306?osCsid=dd3541f22a78927927aa9d610c77bbbb

 

[yar]

Re: SY Transfercase

What are the part numbers for the syclone TC. I am trying to buy a new one but dont know which one is for the syclone. I know the ty;s have a different part number/ model number then the syclones but not sure which one is which. I think one is 27 spline and the other is 32 but not sure.

Ck. your PMs
Ray

 

[MIXEDBREED]

Re: SY Transfercase

Ok so idk if this is a good test for the tc or not but bere is what I did. I put the tru@ck on jackstands ie all four tires off the ground. I put the truck in drive and looked under it to see if the propshaft was moving and it was turning just fine. The front left tire turned very slowly and the pass front tire did not move at all. I am now thinking it may be a front diff problem rather then the tc. I know if i drive the truck and go wot ect the back tires just spin and the front does not pull at all. I am going to do this again and have someone give gthe truck some gas to see if maybe something is slipping in the front diff or maybe the tc.

 

[MIXEDBREED]

Re: SY Transfercase

Seems like you have front axle problems.

Leave the truck with all four off the ground.
Put trans in Park.
Put a bar, or big screwdriver in front driveshaft u-joint, and attempt to rotate the shaft. it should have considerable resistance to turning, but it should turn some. The rear shaft should turn in the opposite direction the same 'speed' as the front shaft (ie, 1:1 ratio). any problems here, like you can't turn either dirveshaft at all, indicates T-case problems.

Now:
Leave trans in park.
Block one front wheel so it can't turn. (Put a hammer handle into the wheel hole and block it against the brake caliper). Go to the opposite side and turn the wheel. You should not be able to. If you can, you have front diff or axle (CV joints) problems.

Leave both front wheels free to turn. Trans in park. Turn one front wheel. Other front wheel should turn in opposite direction, at the same 1:1 speed / ratio. If not, front diff is broken.

There's some more tests. BUT:

If you DO have front diff problems, be certain that the t-case viscious clutch is OK. If it is locked-up, this is what caused the front diff to fail. The front diffs are very reliable. They don't seem to suffer from failures out of the blue, other than those caused by loss of oil.

I didnt even have to block the wheel, I can turn either one and the other does not move. i can hear a chatter/ clunking noise when i turn either front wheel but the other one stays put. I am trying to find my pry bar to turn the propshaft and do that test.

 

[CavScout]

Re: SY Transfercase

...I think one is 27 spline and the other is 32 but not sure.

So...which is which? I searched for the answer this morning and came up with the same. "One has 27, the other 32." Nothing more specific than that.

 

[yar]

Re: SY Transfercase

so...which is which? I searched for the answer this morning and came up with the same. "one has 27, the other 32." nothing more specific than that.

syclone typhoon
27 32

 

[yar]

Re: SY Transfercase

so...which is which? I searched for the answer this morning and came up with the same. "one has 27, the other 32." nothing more specific than that.

syclone-----27 typhoon------32

 

[CavScout]

Re: SY Transfercase

Outstanding, now I can get rear output seals. Thanks.

 

[jwaller]

Re: SY Transfercase

the front diff is open so just bc only 1 turns it doesnt mean anything

 

[MIXEDBREED]

Re: SY Transfercase

the front diff is open so just bc only 1 turns it doesnt mean anything

So how can i test to see if its good. Something has to be messed up if only power goes to the rear wheels lol. The front propshaft turns when in drive so the tc has to be giving some power throught the tc to the propshaft but somewhere there is a break.

 

[jwaller]

Re: SY Transfercase

So how can i test to see if its good. Something has to be messed up if only power goes to the rear wheels lol. The front propshaft turns when in drive so the tc has to be giving some power throught the tc to the propshaft but somewhere there is a break.

you cannot test the xcase with the truck in the air. put it back on the ground and go to a parking lot and make some tight on lock turns. see if you get front wheel hop.

if you don't then it's fine. if you do then the vc is locked up and should be replaced.

can you do rear wheel only burnout's with ease? if not then you are sending power to the front and it's being put to the ground.

 

[MIXEDBREED]

Re: SY Transfercase

Oh, nonsense. There are several tests that can be done with it in the air. Your "hop test" will only reveal a locked V-clutch. It will not identify a loose or 'open' one. And when something breaks doing your test, you'll know for sure the V-clutch is locked. (In other words the parking lot test is a dumb idea, because it CAN break something.) It IS possible to detect a locked V-clutch with the truck in the air. I've done it many times.



OK John. Read the description and results of his test again.
He indicates front driveshaft is turning.
We will assume rear tires are turning
LF turns "very slowly". We will assume this means slower than the rear wheels.
RF "doesn't turn at all".

HOW CAN THIS BE, John? Sure the front is open, but if one tire is turning 0-rpm, then the other HAS to be turning 2X rear wheel speed (assuming the rears are turning same speed because posi is locked.) He sure didn't indicate these are his results.

IF it isn't, the front diff has issues. And he hears noises from the front axle.You didn't say his front diff is fine, but if it IS broken, then the V-clutch is probably locked. I suggested he check it, so he can fix the root cause (t-case v-clutch) at the same time he fixes the obvious (front differential / axles). Yes, in another thread he says he can spin the rears easily under power. Another indicator of a busted diff and a locked v-clutch.

No sense in busting another differential to check the v-clutch with a "parking lot test". It can be done in the air, the way I described above.

Regards,
Anonymous SyTy Peep
That know a lot more than his post count indicates.

Yes the front driverside tire spins very slowly so slow that it is barley moving slow. And the pass side does not move at all. The rear tires spin just fine and will do a rear wheel burnout with ease without the truck moving forward. And as for working on it with the truck on, I have never done that all I did was look under the truck from the side while it was in drive to see if the propshaft was turning and it was.