Low and Reverse Band Servo Piston Pin Check

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

J 21370-10 Band Apply Pin Gage. See Special Tools .
J 38737 Band Apply Pin Checking Tool. See Special Tools .

Fig 1: Installing J 21370-10 Into Low & Reverse Band Servo Pin Bore

Courtesy of GENERAL MOTORS CORP.

Install the J 21370-10 into the low and reverse band servo pin bore. See Special Tools .
Position the J 38737 over the low and reverse band servo bore with the hex hub facing the parking pawl linkage. See Special Tools .

NOTE: Refer to Fastener Notice in Cautions and Notices.

Fasten the J 38737 to the case with two low and reverse band servo cover bolts (61). See Special Tools .
Tighten: Tighten the bolts to 24 N.m (18 lb ft).
Verify that the J 21370-10 moves freely in the J 38737 and in the low and reverse band servo pin bore. See Special Tools .
In order to determine the correct low and reverse band servo piston pin length, tighten the hex hub of the J 38737 . See Special Tools .
Tighten: Tighten the hex hub of the J 38737 to 34 N. See Special Tools .m (25 lb ft).
Observe the lands on the J 21370-10 in order to determine which land is even with the top edge of the J 38737 . See Special Tools . Note the letter (A, B or C) stamped on the J 21370-10 . See Special Tools .
Refer to the Low and Reverse Band Servo Piston Pin Specification chart, in the Transmission General Specifications , in order to determine the correct pin length to use.