Torque Tube Coupler Bolt - Head Size
Thread Starter
Instructor
Joined: Feb 2006
Posts: 143
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From: Wichita KS
Torque Tube Coupler Bolt - Head Size
I am in the process of rebuilding the torque tube on my 02 Z06, and I ordered a new set of coupler bolts from my dealer. They are the correct size (12mm), but they have a T55 head on them instead of the T45P (Torx Plus). Does anyone know if GM changed them? The larger bit is going to make it more difficult to install (and later remove), as it is impossible to get at the bolts straight on from the torque tube side, especially on the output end.
Thanks.
Thanks.
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I am in the process of rebuilding the torque tube on my 02 Z06, and I ordered a new set of coupler bolts from my dealer. They are the correct size (12mm), but they have a T55 head on them instead of the T45P (Torx Plus). Does anyone know if GM changed them? The larger bit is going to make it more difficult to install (and later remove), as it is impossible to get at the bolts straight on from the torque tube side, especially on the output end.
Thanks.
Thanks.
HTH
Le Mans Master
Joined: Sep 2003
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From: Farmington CT
Cruise-In VII Veteran
what's the part number on the Tube and propshaft?
I'll post up the info pn's I have
Rodney from RPM in Indiana would have the best answer, I don't recall the T45plus bit being used on the later coupler bolts
I'll post up the info pn's I have
Rodney from RPM in Indiana would have the best answer, I don't recall the T45plus bit being used on the later coupler bolts
Thread Starter
Instructor
Joined: Feb 2006
Posts: 143
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From: Wichita KS
The part number on my tube is 12564457. The input shaft part number is DD4801, and the output shaft part number is UD-32-140 AC16.
The bolts fits, and the heads are the same diameter, it's just the OEM was a T45P and the replacements are a T55. Seems strange.
Thanks for your help!
Steve
The bolts fits, and the heads are the same diameter, it's just the OEM was a T45P and the replacements are a T55. Seems strange.
Thanks for your help!
Steve
Last edited by txst; Dec 31, 2012 at 03:15 PM.
Thread Starter
Instructor
Joined: Feb 2006
Posts: 143
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From: Wichita KS
I called RPM Transmissions and they couldn't say for sure they have seen this.
I just don't want to screw up the balance of the assembly. This is not a job I want to do twice.
Anyone out there seen this before???
I just don't want to screw up the balance of the assembly. This is not a job I want to do twice.
Anyone out there seen this before???
Thread Starter
Instructor
Joined: Feb 2006
Posts: 143
Likes: 4
From: Wichita KS
I opened up all of the packages of the bolts I ordered and what do you know - 2 different size heads, even though they are all the same part number - 88894027. I have 9 of the T55 headed bolts and 3 of the T45P headed bolts. There are the following differences in the packaging:
T55 Headed M12 bolts:
"License Plate" number UN753030568S1028723
"Shipment Date" 21JUN2010
T45P Headed M12 bolts:
"License Plate" number UN753030568S1027696.
"Shipment Date" 06DEC2010
So now I am assuming that they made a change sometime after Jun of 2010 and there are warehouses with old and new inventory. Since they are all the same part number, it's a crapshoot as to what you will get. These all have Unidrive Pty Ltd on the packaging and were bought through a dealer.
Guess I will order 5 more and hope I eventually end up with a matched set. I don't want to risk any balance issues.
Just wanted to pass this information on to anyone else going through a torque tube rebuild.
Steve
T55 Headed M12 bolts:
"License Plate" number UN753030568S1028723
"Shipment Date" 21JUN2010
T45P Headed M12 bolts:
"License Plate" number UN753030568S1027696.
"Shipment Date" 06DEC2010
So now I am assuming that they made a change sometime after Jun of 2010 and there are warehouses with old and new inventory. Since they are all the same part number, it's a crapshoot as to what you will get. These all have Unidrive Pty Ltd on the packaging and were bought through a dealer.
Guess I will order 5 more and hope I eventually end up with a matched set. I don't want to risk any balance issues.
Just wanted to pass this information on to anyone else going through a torque tube rebuild.
Steve
