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91 Formula 305 TPI 5 Speed...
Astro A5 with GForce Case
Rebuilt 10 bolt, premium parts...
Spohn Adjustable TQ Arm & Drive Shaft Loop.
Founders LCA's and Panhard bar
3/4th gen Aluminum Drive shaft
Here is a pic of the yoke sticking out more than it should from T5 tail end...
Stock height Springs (a couple years old), car on all 4 tires...
I bought the aluminum drive shaft years ago... just recently upgraded trans... and noticed this...
1st thing I need to do is measure it yoke to yoke center, should be 41.5 inches.
Then also measure LCA length...
I'm gonna measure the drive shaft first....
I bought it as a 3rd / 4th gen one, but didn't measure it.
If it's 41.5, then it is... so then next thing is LCA length...
If that checks out, I'm not sure what is going on..... so at that point have it looked over and possibly get a longer drive shaft...
But before plunking down $400, I need to figure out what's up...
Stock everything (locations wise).
I do have poly engine mounts and trans mount...
Spohn trans cross member with poly mount screwed into T5
No reloaction brackets....
I hope the it's the drive shaft, that would be a cheap fix...
The best driveshaft length is to slide the yoke into the trans as far as it will go then pull it back out 1". Measure center to center on the u-joints for a driveshaft length.
Some yokes because of how the internal splines are, will not slide in as far as others. Although yours looks like it sticks out too much, how much is going into the transmission? Still enough to be sealed unless pulling it out slightly uncovers the seal.
Mechanic said it would slide into trans, no problem... but then when you bolt it to rear end... it pulls out as seen in pic...
This is not a stock Yoke (DS to Trans), my mechanic has stock one, sending pic to see how much the thicker the base is...
Put the car up on ramps and measured the DS....I was told that, "thirdgen shaft is 41 1/2 from center of the U to center of the U".
I took this to mean the opening on the DS where the hole / cap / u joint is (in the middle) to the other end same spot...
DS was 40 5/8ths..... Assuming I understood the correct way to measure it...
The best driveshaft length is to slide the yoke into the trans as far as it will go then pull it back out 1". Measure center to center on the u-joints for a driveshaft length.
Some yokes because of how the internal splines are, will not slide in as far as others. Although yours looks like it sticks out too much, how much is going into the transmission? Still enough to be sealed unless pulling it out slightly uncovers the seal.
The 1" part is correct, but the latter part would have less than 1" of spline engagement, at which point bad things are already happening, things that get people killed.
Ok... new pic... car rear wheels are on ramp, nose heavy, might make yoke longer / slip out more (if my physics are correct)....
Shows about 2.5 inches... again, no donut on as seen on stock yoke...
The main shaft seems to stick out .5 inches (from a pic I have)... was told yoke tube is about 4.5 inches total...
And I still see people saying it.s 41.5 and 40.75 and they're the same...
Ok, just so you can sleep better, I went out and took a pic of the 2 side by side.
There is a difference in measurements from U-joint to U-joint buuuuuut that's because of the little balancer that's put on the yoke, not all of them have the balancer.
The over all working length is the same (within 1/8 inch)
The U-joints at the other end are evenly lined up in the pic. You can see the who, what, why,when and where the changes came from. I never noticed the center to center difference B4 because the length was the same.
So if I had the yoke that didn't have a balancer on the shaft that originally came with one, it would be short. Do you want to sell that longer drive shaft? Trade up some new SLP MAF intake parts (never used)???
I would love to trade but the drive shafts are the same total length. (the 4th gen shaft is sold anyway)
To change that, you would have to put the yoke w the balancer on the 3rdgen shaft.
Did you notice how little of the driveshaft was actually in the trans on these? only about 2"
I need the 3rd gen one... if the yolk with the balancer were placed on the 3rd Gen one, it would be longer. Inversely the other way would be shorter, which is what I have now. The 3rd Gen one from center of the u-joint is not. 75 inches longer than the other one? Disregarding overall length with the slip yoke.
Shaft length is measured between u-joint centers. The yoke has nothing to do with the shaft length. But a longer yoke can allow getting away with a short shaft.
Why the weight savings of an aluminum shaft if you're just going to use a yoke that is extra heavy unnecessarily? There are longer yokes without dampers. Or maybe just remove the damper?
Yolks are egg fillings.
ok guys im havimg the same damn problem .i just replaced my engine which is carberated but thats beside the point all in all there is a two inch difference in lengths. i took the teil section from my6 700r4 ond the tailend of the shaft is now inside the tail piece itself.can i get away with just using a longer yolk
04-21-2015, 05:52 PM
