I was told by the guy that built my latest transmission that the 4l60s shouldnt be taken past 6400 rpms because of tolerances and such. My shift points were set between 6200 and 6400 anyway so I wasnt really worried, but I see some of you guys shifting at over 7000 and always wondered how the trans was taking it. Is there any truth to this?

 

I see people over on tech talkin about not shifting up thier or it will blow. But hell nobody over here has a problem blowing them around 6200 or so.

 

mine was shifted day in day out around 6800 miles. never had and issue with it. it was toren down at 8k just to see and it was as fresh as day 1. it also seen 7500 a few times and shifted at 7200 a few times also. i specifically told the builder where truck was going to shift and the built it to tolerate it

 

He did say he put a little more clearence in the pump to help it flow more at higher rpms. Im just wondering what else would need to be done to help it handle high rpms.

 

vac mod, full race springs, i had 2 shims, both servos and other things. makes for annoying shifting trans on the street. in traffic in 5-10mph bumper to bumper it would get annoying shifting hard

 

can you PM me who built it?

 

Yeah the HD-2C has some high-rev springs that allow for higher rpm shifits.

 

I shift mine @ 6800rpm and rev limiter set @ 7100rpm... nothing wrong with it yet.... (knock on wood)

by the way I think your shiftpoints are way low..

 

PM mater and tell him you need or want a trans built like mine.

 

done thanks!