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Isn't this for the pre-'09 4-speed trannies only?
NNBS or NBS doesn't matter, as long as it's the 4L60E. Same transmission, same parts, same replacement procedure.Really? I didn't know that many people had the corvette servo on the nnbs vehicle's... i've seen a lot of threads for the nbs but not nnbs... i'm interested for more info on this for people with the nnbs that have had this done!
NNBS or NBS doesn't matter, as long as it's the 4L60E. Same transmission, same parts, same replacement procedure.
And if you're doing the Corvette servo, do yourself a favor and get the Superior 4th gear servo at the same time.
http://www.superior-transmission.com/Product_Page.cfm?ID=73
Just search for the part number on eBay. There are multiple sellers for that item. I can't remember exactly how much it was...but I believe I paid around $60-65 shipped for the Corvette servo and Superior 4th gear servo together from the same seller.Thanks for the info! I'm a novice at performance/transmission stuff in general so I didn't know that the nnbs and nbs had the same tranny. I clicked on the link and I don't see a price or where to buy? How much did you pay for yours? Is this something I should get before my BB Tune? TIA!!
Just search for the part number on eBay. There are multiple sellers for that item. I can't remember exactly how much it was...but I believe I paid around $60-65 shipped for the Corvette servo and Superior 4th gear servo together from the same seller.
If you take your time and be very careful you can still do the replacement in about 30-45 minutes. Pretty simple, just have to pay attention... And yes, definitely get this done before a BB tune.

vette servo is 1-3 clamps down harder on the clutchs. the superior is the same but for 4th.
You go in and out of 4th more than any other gear while lugging the engine. it only makes sense to improve the clamping force on the pack more than 1-3.
Shit! I got my 08 Yukon Denali jacked up, pulled the heat shield expecting to se the servo, and NOTHING! It is not there!!!!!!!! I am wondering if I have a different transmission? How do I find out what trns I have?
You should have the 6L80e