T56 Mainshaft & Countershaft shimming
04-06-2008, 12:26 PM
#1
Banned
Thread Starter
iTrader: (3)
Join Date: Jan 2005
Location: Chicago, IL
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
T56 Mainshaft & Countershaft shimming Would like someone to lend advise on shimming a T56. Transmission will see 750-850 rwhp if it makes a difference. All the bearings were replaced along with all the bearing races
I have my dial indicators setup as desribed in the GM High Tech Performance article here: http://www.gmhightechperformance.com...ild/index.html
Mainshaft:
Here is how the endplay is checked on the main shaft. Once again, Joe shoots for 0.003 inches of preload.
Countershaft:
Joe bolts a steel plate to the top of the tranny, so that he can use a magnetic gauge to check the endplay on the cluster shaft. This is done using the threaded rod that was installed on the last step. He prefers to build them at 0.003 inches of preload.
Now from the TTC Manual:
Mainshaft
Select shim (6) to achieve 0.000 to 0.002 in.
(0.00 to 0.05 mm) end play.
Countershaft
Select shim (102) to achieve 0.000 to 0.002
in. (0.00 to 0.05 mm) preload.
Countershaft Extension Shim
Select shim }(131) to achieve 0.002 to 0.005
in. (0.05 to 0.13 mm) end play.
If I am reading it correctly Joe at SixSpeedsInc recommends .003" preload on both the mainshaft & coutershaft while Tremec recommends end play on the mainshaft & preload on the countershaft.
What does everyone recommend for the Countershaft Extension? Looking more at the strength aspect and I will be running 1/2 Mobil 1 ATF & 1/2 Viper transmission fluid.
I have my dial indicators setup as desribed in the GM High Tech Performance article here: http://www.gmhightechperformance.com...ild/index.html
Mainshaft:
Here is how the endplay is checked on the main shaft. Once again, Joe shoots for 0.003 inches of preload.
Countershaft:
Joe bolts a steel plate to the top of the tranny, so that he can use a magnetic gauge to check the endplay on the cluster shaft. This is done using the threaded rod that was installed on the last step. He prefers to build them at 0.003 inches of preload.
Now from the TTC Manual:
Mainshaft
Select shim (6) to achieve 0.000 to 0.002 in.
(0.00 to 0.05 mm) end play.
Countershaft
Select shim (102) to achieve 0.000 to 0.002
in. (0.00 to 0.05 mm) preload.
Countershaft Extension Shim
Select shim }(131) to achieve 0.002 to 0.005
in. (0.05 to 0.13 mm) end play.
If I am reading it correctly Joe at SixSpeedsInc recommends .003" preload on both the mainshaft & coutershaft while Tremec recommends end play on the mainshaft & preload on the countershaft.
What does everyone recommend for the Countershaft Extension? Looking more at the strength aspect and I will be running 1/2 Mobil 1 ATF & 1/2 Viper transmission fluid.
