ZF-6 problem

Stroked550

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Not sure the best way to describe this but here it goes (assuming gears are labeled 1-6). 4th gear engagement is a bit off, like its not going in all the way, 5th is way off, and its impossible to get it in without grinding. Happened suddenly, truck popped out of 5th while under very light throttle and has been like this since. Any ideas?
 

Charles

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I've had two of them do this after sustained heavy towing where they overheated. In my experience the ZF6 just can't take the heat.
 

Charles

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My 550 lost 4th gear recently. When I replace the trans I will be adding an automatic trans cooler up front. The one before this one did exactly as you describe above. Started popping out of 5th then 4th.
 

Jake

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Neighbor s truck did this with third and the trans is trashed and he is having hell getting a quality reman
 

Petro

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My 550 lost 4th gear recently. When I replace the trans I will be adding an automatic trans cooler up front. The one before this one did exactly as you describe above. Started popping out of 5th then 4th.

Make sure you make a thread on this, I would like to do the same thing and would like to see how you do it.
 

co04cobra

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Sorry if I missed it but what year truck. 6.0 or 7.3 and 2wd or 4wd? I might have a good used trans to fit your needs.
 

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