3-4 cluth return spring?
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Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
I have been putting in stiffer springs from the Transgo HD2 kit. Since they are more than twice as stiff as the stock springs, I just put in 16 of them and NOT the 22 the instructions say for high rev engines. Note that with these stiff springs the hooks are not re-engaged.
Question - why are you doing this?
Thread Starter
Staging Lane
Joined: Apr 2004
Posts: 93
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From: kenosha, WI
3-4 clutch pack failure just going through it replaceing clutches, seals and any bushings that may be worn out. Trans has an HD2 kit in it from an earlier rebuild which a mechanic friend of mine did since I didn't exactly have all the tools needed at that time to do it myself. The trans has 90,000 miles since that rebuild.
TECH Resident
Joined: May 2006
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Are you adding the TransGo Performance Shift kit and anything else here? If you are going over 5,500rpm, add all the springs to both spring setups. Set up the 3-4 clutch clearance at .020" - .035". If you want help here on this call me and I will answer any questions you have here. 909 795-1876. Dana
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Joined: Aug 2010
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From: Ann Arbor, MI
As PBA points out, stiffer springs and a tight clearance is recommended for high RPM performance applications. Of course, you also need the higher line pressure and minimum .093 3rd feed hole provided by the shift kit.
Personally, I choose not to put all the HD springs in, but use the stock 3/4 load release springs to keep a .030 clearance between the frictions and perhaps reduce drag in 1st and 2nd gears.
Personally, I choose not to put all the HD springs in, but use the stock 3/4 load release springs to keep a .030 clearance between the frictions and perhaps reduce drag in 1st and 2nd gears.
Registered User
Joined: Oct 2012
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Hey guys new to the forum here. Just had a couple of questions about this TransGo HD-2 kit. That part in the pic is what I have questions about it says that you have to put the 22 springs in and I did but the springs break off the hooks. Is there a way to not break them and is putting 16 good enough or does it have to have the 22 springs? And mrvedit what do you mean by with the stiffer springs the hooks are not re-engaged? Any info would help thanks.
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Joined: Aug 2010
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From: Ann Arbor, MI
Just bend the hooks completely out of the way when using the HD2 springs. Attempting to hook them would warp the cage.
Of course you now have lots of loose parts which require more care during assembly.
I'm not an expert here, so IMHO either use 16 AND the 3/4 load release springs or 22 without the the 3/4 load release springs. I figured that doubling the spring cage stiffness should be enough.
Here is my math behind it:
Centrifugal force goes up by the square power of the velocity or RPM. So, doubling the force is caused by a square-root of 2 (about 1.42) increase in RPM. Therefore, I figured if the stock springs can handle 5500 rpm, doubling their stiffness should be able to handle 5500 x 1.42 = 7800 rpm.
This is very approximate because the high rpm deforms the spring and weakens the force on the cage.
Of course you now have lots of loose parts which require more care during assembly.
I'm not an expert here, so IMHO either use 16 AND the 3/4 load release springs or 22 without the the 3/4 load release springs. I figured that doubling the spring cage stiffness should be enough.
Here is my math behind it:
Centrifugal force goes up by the square power of the velocity or RPM. So, doubling the force is caused by a square-root of 2 (about 1.42) increase in RPM. Therefore, I figured if the stock springs can handle 5500 rpm, doubling their stiffness should be able to handle 5500 x 1.42 = 7800 rpm.
This is very approximate because the high rpm deforms the spring and weakens the force on the cage.
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Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
I assemble the loose-spring case inside the 3/4 apply-spacer and then carefully place that into the input drum on top of the 3/4 piston. Make sure all the spring are still in place.
