I have a 4T60E HD from a 96 Park Ave Ultra. I'm installing a Transgo SK 4T60E-JR shift kit and I need to know if my torque convertor is Carbon Fiber or not. I don't have the VIN number from the original car or the data plate from the tranny. I was hoping one of the experts here knows if the HD trans for this year came with or without the carbon fiber TC. There is a barcode label on the TC but nothing comes up when I do a search.

[This message has been edited by TbirdMarc (edited 05-02-2014).]

Ok, first off the 4T60-E HD was only produced one model year - 1996. And those transmissions were only used with the 3800 Series 2 SC engine.

If you have a 1997 Park Avenue Ultra that came with a 3800 Series 2 SC engine, then it has the 4T65-E HD trans and not a 4T60-E.

If you have a 1997 4T60-E trans, then it is a non-HD trans.

I have some incomplete info on GM FWD transmission torque converters:

quote GM FWD Torque Converters 1st Digit (application trans) •F -- 125C, 440-T4, 4T60, 4T60-E (245mm) •J -- 4T65-E HD (258mm) 2nd Digit (approx stall (depends on engine) •A -- 2795 rpm •B -- 2560 rpm •C -- 2385 rpm •D -- 2095 rpm •E -- 1865 rpm •G -- 1630 rpm •H -- 1515 rpm •J -- 2060 rpm •K -- 2760 rpm •L -- 1895 rpm •M -- 1525 rpm •Y -- 1420 rpm •Z -- 2375 rpm 3rd Digit (TCC clutch material) •0 -- Clutch omitted by factory •5 -- Clutch contains poppet valves All other digits (pre 1996): •Red Fiber material 1996-97 •C, E, H, K, P -- Carbon filled clutch 1998-up •F, H, K, Q -- Woven graphite clutch 4th Digit (Clutch Type) •B -- standard •C -- viscous

-ryan

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Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com

[This message has been edited by Darth Fiero (edited 05-02-2014).]

It's a 96 sorry mistyped. It is a HD trans because I have HD axles fit into it. I did find some info on the web about it and it appears to be a paper clutch (LUK) whatever that means.

[This message has been edited by TbirdMarc (edited 05-02-2014).]

quote Originally posted by TbirdMarc: It's a 96 sorry mistyped. It is a HD trans because I have HD axles fit into it. I did find some info on the web about it and it appears to be a paper clutch (LUK) whatever that means.

What the paper clutch means is it is not designed to be used with GM's ECCC lockup strategy. The ECCC lockup strategy lets the TCC slip some at all times when it is applied. You can't do this with paper type clutches because they will just burn up.

If you use a 96 L67 PCM or my custom tuned 98 PCM (using the 4T60-E logic), you will have no issues with the lockup.