B.O.P Th400
#1
B.O.P Th400
Just curious, I will eventually have a local transmission shop rebuild my Olds th400 transmission to withstand 450-475 hp and about 550 foot pounds of torque. What are the weak links in a th400? I've heard the sprag gears are a weak link but I know there are guys here who know th400's.
This car won't see any track time but I don't want to blow it up either (transmission). Any suggestions,tips etc would be appreciated.
Thanks!
This car won't see any track time but I don't want to blow it up either (transmission). Any suggestions,tips etc would be appreciated.
Thanks!
#3
The sprag you refer too is probably the weakest part I've heard of but overall the trans is pretty beefy. Several companies make a 34 element sprag that is over twice as strong as the 16 element one. I also know that holding it in 1st gear to do a burnout (such as at the drags) is a no no. Shift it into 3rd as soon as possible in those situations.
I don't know the specifics but it has something to do with the internals changing direction on the 1-2 shift. I actually hope someone responds to this with more knowledge of this issue. Wouldn't this happen on normal acceleration also? Why is it worse in a bleach box than under normal conditions? I look forward to this thread.
I don't know the specifics but it has something to do with the internals changing direction on the 1-2 shift. I actually hope someone responds to this with more knowledge of this issue. Wouldn't this happen on normal acceleration also? Why is it worse in a bleach box than under normal conditions? I look forward to this thread.
#6
I upgraded to the 34 element sprag on mine when I rebuilt it and also run a trans cooler. In the meantime I added a Derale pan with cooling tubes and drain plug. Adds about 1 qt extra fluid also. Does it work? Or hype? I don't know. But I added it anyways.
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January 21st, 2011 05:38 AM