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Old 01-01-2004, 10:54 PM   #1 (permalink)
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Steel Shift Forks

I need some help from those of you that have done the shift fork replacement.

Has anyone had their shift forks replaced with steel forks as a warranty replacement? I have been having some 1-2 shift problems and the dealer has ordered a 2nd gear syncro pack to try and fix the problem. I plan on going down to the shop once it's open to see how the inside of the box is doing. Supposedly the pack comes with 2nd gear, 2 & 3 syncro's and assembly parts.

I'm wondering if I can get the shift forks in my '01 replaced with steel forks while the case is open, and how much additional work it would be. Also, if there's a way to get it done as warranty (yes, I'm still under warranty) that would be great too.
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Old 01-01-2004, 11:22 PM   #2 (permalink)
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Actually they come in packs of 1 & 2, 3 & 4, and 5 & 6.
It is easy for them to change out the al. 3-4 shift fork with the steel once they are in there.
Fork only cost around $75.00, tell them to replace it.
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Old 01-02-2004, 12:35 AM   #3 (permalink)
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Quote:
Originally posted by FRC Tom
Actually they come in packs of 1 & 2, 3 & 4, and 5 & 6.
It is easy for them to change out the al. 3-4 shift fork with the steel once they are in there.
Thanks for the info.

I was going by what the service manager told me came in the package, although it didn't totally make sense.

Why only the 3-4 shift fork? I have heard that other places also. I've never bee inside one of these gearboxes so I don't know the fork setup or nuances. It would seem like 1-2 would be a higher leverage shift just given the straight shot of the shift and a more frequently hard-shifted location.

I've been referenced to a TSB# 1230114 as well as PI 00597A regarding syncros and this transmission but can't track to either (not sure what a PI is - is this a Product Improvement)?
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Old 01-02-2004, 06:19 AM   #4 (permalink)
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Quote:
Originally posted by FRC Tom
Actually they come in packs of 1 & 2, 3 & 4, and 5 & 6.
It is easy for them to change out the al. 3-4 shift fork with the steel once they are in there.
Fork only cost around $75.00, tell them to replace it.
Good Advice!
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Old 01-02-2004, 08:14 AM   #5 (permalink)
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From what I have seen, the 3-4 steel shift fork is now an "instock" item to be used for replacement in the MN12 trans. This shift fork became standard issue in the '03 model T56 trans. The forks are the same as the viper T56's. However, the 1-2 shift fork is a different design and would not fit into the MN12 of our Z06's. This may have changed since I last had my trans replaced last October.
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Old 01-02-2004, 09:13 AM   #6 (permalink)
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as you can tell Ive had big problems with my transmission.{I'm on my 5th transmission rebuild } in my car every 300-400 miles it was in for service the last time they installed all new syncros and the 3-4th steel shifting fork, and its lasted almost 800 miles with no problems yet ....i was having so many transmission problems that i was afraid to really mod my car for fear of voiding my warranty .....
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Old 01-02-2004, 09:14 AM   #7 (permalink)
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by the way when i had the transmission done the last time they told me the only steel fork availible was the 3-4.....
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Old 01-02-2004, 09:58 AM   #8 (permalink)
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Quote:
Originally posted by U LUZ
by the way when i had the transmission done the last time they told me the only steel fork availible was the 3-4.....
The only al. shift fork in the T-56 is the 3-4 the others are steel.
AntiVenom did mine while doing my syncros. I only had problems with 2nd also, but this part of the 4th gear syncro.
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Old 01-02-2004, 10:50 AM   #9 (permalink)
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Quote:
Originally posted by FRC Tom
The only al. shift fork in the T-56 is the 3-4 the others are steel.
AntiVenom did mine while doing my syncros. I only had problems with 2nd also, but this part of the 4th gear syncro.
Was the steel fork part of a kit or is it a single part - do you still have the part number?

Any idea on TSB# 1230114 or PI 00597A

Still looking to see if anyone's been able to get a dealer to do this as a warranty item.
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Old 01-02-2004, 11:01 AM   #10 (permalink)
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Quote:
Originally posted by SNYSDUP
Was the steel fork part of a kit or is it a single part - do you still have the part number?

Any idea on TSB# 1230114 or PI 00597A

Still looking to see if anyone's been able to get a dealer to do this as a warranty item.
Single part and it has been done under warranty.
I don't have the part# but it is the only 3-4 fork GM sells and replaces, all Z06 trans. since mid year '03 are steel.
I would ask them to do it for preventitive reasons while they are in there.
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Old 01-02-2004, 11:16 AM   #11 (permalink)
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My aluminum shift fork (3-4) was replaced with the GM steel unit, under warranty.

Les


Quote:
Originally posted by SNYSDUP
Was the steel fork part of a kit or is it a single part - do you still have the part number?

Any idea on TSB# 1230114 or PI 00597A

Still looking to see if anyone's been able to get a dealer to do this as a warranty item.
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Old 01-02-2004, 12:07 PM   #12 (permalink)
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The new forks are actually made of iron.
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Old 01-02-2004, 05:20 PM   #13 (permalink)
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Interesting. When the dealer mechanic first talked about replacing mine he said iron. When I picked it up he said steel, either way I was happy to have the fix under warranty

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Quote:
Originally posted by FUBU69
The new forks are actually made of iron.
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Old 01-03-2004, 06:25 PM   #14 (permalink)
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I hope the new trans in the C6 really is better. But, I think the real culprit is the lousy clutch and I have not seen that mentioned in any of the write-ups.

Anyway, here is a link to my web page concerning the transmission with pic's of the trans apart, etc. Unless you are a transmission guru, in which case you would not be posting about this, you really can't tell much from looking at the gears, etc. The wear marks are very subtle.

The big problem with the aluminum shift forks is where they ride on the shift shaft. The hole enlarges and the fork rocks which prevents the gear from being fully engaged. This, in turn, trashes the syncro's, etc. JMHO.

http://temp.corvetteforum.net/c5/steve_row/index5.shtml
Good luck!

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Old 01-03-2004, 06:34 PM   #15 (permalink)
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Anybody know the number when the shift to the steel forks was on the line?
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