Quote:
Originally Posted by Clyde65
Thanks Cline!
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Your welcome, Hopefully it helps someone.
The next weakest link is the Intermediate Sprag....
4L80E's have a 34 Element Sprag from the factory, And are pretty stout.
'69 & earlier TH400's use a 16 Element Sprag.
'70 & up TH400's have a 8 Element Roller Clutch. Under 450HP applications will be OK, A lot of HP & torque, & Harsh 1-2 shifts will kill this Roller Clutch.
If you have a 4L80E, Your good, Though I would replace the sprag with a new Borg Warner.
If you have a Early TH400 (Direct Drum), All you need is a 34 Element Sprag for a 4L80E.
If you have a Late TH400 (Direct Drum), Buy a Early Drum or a 4L80E Drum.
Custom 36 Element Drums are available, Not needed on most anything street driven.
**NOTE, Do not mix the Sprag Races on these 3 drums!!!! The 4L80E Race is taller for the 4 Intermediate Clutches vs 3 on a TH400 & will not fit on a TH400 Direct Drum. Early TH400 Drums are getting scarce, Buying a Complete 4L80E Drum is the best option.
This is a pic of a 4L80E Direct drum with a 34 Element Sprag.