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Anyone know the primary resistance range of D585 truck coils? These would be GM part number 10457730 and the resistance measured between pin A and pin D. I understand these need to be setup for low dwell time less than 3.5, and are not as preferred as the D581 coils. I have 16 of the D585...

I’ve head varying opinions on preloading the 4L80E vs not when checking front end play. Meaning prying up on the output shaft when taking the front reading for endplay, of course accounting for snap ring float as well. Necessary or not?

@clinebarger Do you know when the change from grooved to smooth drum happened? Any 4L80E drum produced in 1995 is smooth, correct? Or did the change occur mid year in 95? Groove reverse bands have been OOS for awhile now as I understand. Only smooth bands are available and can’t be used on a...

I'm attempting to increase my knowledge on the 4L60E. I know nothing about it, would like to know what it takes to make one of these live at 750hp at say race weight of 3600 lbs, spinning to 7200 rpm. No heavy N2O usage. 2000 core. Street/strip manners. I have a ton of questions, and parts that...

I'm trying to determine if I have actual high pressure or if my transducer is faulty and why there is so much noise in my readings. I'm not sure if what I am seeing is accurate or not. To recap the setup: 2000 Fbody, 2005 core, Jakes D3 Plus, Machined EPC block off plug, line to lube in pump...

@clinebarger I got one for ya. Well this one is a first, at least for me. Didn't have this issue in previous builds. 2004 late 4L80E case Sonnax no walk bushing inverted, confirmed roller bearing makes contact with output shaft and that the bushing is not impacting rear end play in any way...

Looking at swapping my LS1 for a gen 4 iron block and getting my parts list ready. I was able to source a gen 4 iron block (just the L96 block itself) This will be a boosted 403ci stroker. This will be an all 58x setup controlled with an aftermarket ECM. If wanting to use a stock 24x gen 3 ECM...

I'm looking at rebuilding a 4L80E to hold 1100hp. My car is a 3700 lb street car 2000 camaro and I don't want every shift on the street to snap my neck. I do however want firm shifts when going all out with the car. That being said, I want this transmission to live and will be launching it at...