this is my 4rth rebuild on my 4l60e and i'm tired always the 3rd clutch i use nitrous but i had burned also with out it, i want to swap and put the most reliable transmission, is the TH400? i want to buy a transmission that can handle at least 450 rwhp and that if burned become cheap a rebuild.
1994 z28

 

if your tired of breaking transmissions give us a call at 718 784 4256.all transmissions in car tested before shipping and built by one of most knowledgable transmission specialists in the country.guaranteed. www.ckperformance.com

 

Just go to the link in my sig if you want the best of t he best in 4L60E performance builds.

 

don't waste your time with 4l60e, no matter who builds it it will go out once you start getting into the higher power levels. If you insist on sticking with it though check out flp(www.flponline.com), they are probably the best guys out there. They specifically specialize in building f-body transmissions so they know what they're doing. If you want a reliable trans that will last though go with the th400 or if you have the money the 4l80e, which is basically a th400 with overdrive.

 

No good tranny is going to be cheap. A TH400 lacks OD and this really inhibits enjoyable street use. Yeah, when I was a kid we had cars without OD and ran all over the place with them, but I guess I/we am/are spoiled now. If you need a really sturdy auto trans with an OD gear, the two main options are a TH400 with a GV OD or a 4L80. Both are going to be expensive and neither are "plug and play". There are vendors here on the board with good reputations for building 4L60's for moderate power, you could talk to them. I don't know how much he is into the 4L60, but Carl Rossler builds great TH400's and 'glides. I wouldn't be surprised to learn that a 4L60 from him is top notch as well.

One option that has occurred to me though I have never seen it tried. If you have gobs of torque, you could use a TH400 and a very tall rear end gear. It could function like a 'glide with an OD. When I was thinking of a big block for the Z28 this was the way I was leaning. With a 26" tire and 2.73's you could cruise at 60mph at ~2,100rpm. With 28" tires (at the track) 2nd would be good for ~140mph with a 6,800 redline. But a small block in a heavy car might not cut it with the 2.48 first gear. However, there are shorter first gear ratios available. I'd like it if you were the first to try this! I didn't have the guts.

Rich

 

If you have to stick with a 4L60E, then go with Chris at CK. He builds killer tranny's. I have one in my GN and will be going with an AOD for the SS.

 

Along the lines of what Rich suggested--has anyone out there tried a tall gear and a 400 with a 2.75 first gear?