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    D585 coils primary resistance?

    @clinebarger Hi Chris, so I purchased a IG80 coil tester on amazon and while this doesn't take into account dwell time and load, it can tell you if the coil packs are functioning. I don't have a scope so this was the best I could do until I get them on the car. I just wanted to get an idea on...
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    D585 coils primary resistance?

    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...
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    4T80 reliability and 06+ Northstar?

    A TH400 may be my next adventure, just in learning it more. I’ve been linking people to posts of yours from years ago and they have helped out a TON of people. I’ve even built a few performance 4L80E’s for some local guys based on the knowledge you and others have shared with me over the...
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    Pre load when checking 4L80E front endplay?

    So targeting .005-.008 front endplay more/greater than the rear endplay without prying up on the output shaft (not applying any “pre-load” when measuring front end pla) is the correct method then for measuring front unit endplay? Of course for when checking REAR endplay, prying up on the output...
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    Pre load when checking 4L80E front endplay?

    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?
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    4L80E groove to smooth drum year change?

    If someone uses a smooth BW band on a grooved carrier, I'm assuming it won't last very long? Front planets that use a sprag with no legs and the spacer are always grooved, correct? Any luck with the TCI 225105 relined Kevlar's on grooved carriers? The TCI one doesn't even look grooved in the...
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    4L80E groove to smooth drum year change?

    Ah, was hoping all 95 were smooth. Yes using AC Delco filters. Haven't seen one bad myself but others have reported some issues.
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    4L80E groove to smooth drum year change?

    @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...
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    4l80e intermediate clutch breakdown

    In the 1200 rwhp capable 4L80E 2005 based core that you helped me build I'm running the following: -36 sprag aluminum direct drum with no front band so no engine braking in 2nd. I have a case saver where the band was. -The drum uses ford c6 style intermediate frictions that fit around the race...
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    4L60E - Lots of questions!

    Thanks again Chris! This is great info!
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    4L60E - Lots of questions!

    More dumb questions.... 1. Are all the 4th gear sections of the OEM servos pretty much the same, or do they also have variance in them like the 2nd gear section? Meaning if I get a 8642079 or 8673039 Corvette servo, is the 4th gear section the same as what you would find in a Trailblazer SS...
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    4L60E - Lots of questions!

    I will go with the sonnax pinless 4th then and use the sonnax 4th gear servo and drill the 3-4 hole to .093 in the plate along with the other suggestions you provided. Thanks again Chris!
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    4L60E - Lots of questions!

    I read that it's best to use the "updated 1-2 housing", but it didn't even cross my mind that it's the 4L65E! I incorrectly assumed that the 24227711 was a later 4L60E part and didn't cross reference the part. Thanks for the correction! So maybe as an initial attempt, I'll try the following in...
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    4L60E - Lots of questions!

    Thanks Chris, makes perfect sense! So in theory, it would also be possible to achieve more firmness by experimenting further with a different 1-2 orifice hole and leaving the 1-2 Accumulator Setup mostly stock as follows: *Updated accumulator housing 24227711 *Transgo 4L6-2ACM 1995-03 Type 2...
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    4L60E - Lots of questions!

    I have Mitutoyo digital calipers and micrometer. Will get a non digital as advised. Chris, do you know if the overrun spring in the VB of a 4L60E is prone to breaking? The one that Transgo recommends replacing with a yellow spring found in step 6 here...
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    4L60E - Lots of questions!

    4L60E's can live at that power level if built right. I have a 4L80E that will see 1200 rwhp already built with the much needed help from Chris in a different car.
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    4L60E - Lots of questions!

    Thanks again Chris!
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    4L60E - Lots of questions!

    Haven't gotten that far yet into the gear ratios, but I'm assuming it can be wired to manually shift (or to rule out electrical issues) similar to the 4L80E.
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    4L60E - Lots of questions!

    Chris, thanks again for taking the time to get me squared away! I just got a hard copy of the hydramatic technicians guide to study up on the lube circuits! These are getting harder and harder to find in hard copy form.
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    4L60E - Lots of questions!

    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...
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