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Old 06-16-2017, 08:45 PM   #152
clinebarger
Senior Member
 
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
Re: 4L80E & TH400 Tech.

Geartrain Install & Rear Unit End play

Measure the thickness of the 3-Tab selectable Washer & 4-Tab Thrust Washer, (Measure them while stacked together)
Lets say they measure .150" & your pre-teardown end play was .025"......You will want the Bearing & Shims to measure .170".....This will give you about .005" rear unit endplay, You can run as tight as .003" with a bearing on the Output. .008" is my limit.

Install the Shims then the Bearing over the Bushing (Silver side UP, Black side DOWN.

Before stacking the geartrain in the Case, Check the Reaction Carrier End Play buy stacking the unit up to the Center Support on the bench, Use both your thumbs to hold the center support down while lifting the reaction carrier up with your fingers. There is not really a way to use a Dial Indicator here so you have to go by feel.
Set to .008" to .015" using Sonnax shim pack 34006-05

"IF" the old Brass REAR thrust washer is in good shape.......Replace the Plastic Thrust Washer between the 2 Carriers with it, They are about the same thickness (.060") & the Sonnax shims work with it also.

You can now stack the trans up to the Center Support, Install the center support snap ring & check rear unit end play.

Selectable & Thrust on the bottom, Bearing & Shims on top


Bearing & Shim installed in the Case, The Bearing is upside down in the photo!


Check Reaction Carrier End Play, Check Direct Drum to Forward Hub End Play at the same time


Replace the Plastic Thrust on the Output Carrier with the Brass Washer you removed from the Output Shaft.

Plastic


Brass


Final Check Rear Unit End Play
Attached Images
 

Last edited by AussieinNC; 07-07-2020 at 06:40 PM.
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