It’s time to rebuild/replace 4l60e
I did a Yank 3500 to my LS1 when it was completely stock other than an air lid and catback exhaust. The performance improvement was dramatic, to say the least. LOL.
I had the 1G 2500-2800 behind a stock 5.3L and it felt sluggish. But the trans wasn't built right and gernaded. Also didn't make it long enough to get the rear gears swapped. Hated those 3.42s
I upgraded to the 2G 3000-3200 and put it behind a cammed and ported heads 6.0L, it didn't feel like it had enough stall. Pulled the 6.0L to go stroker and put a cammed 5.3L with 10:1 compression in its place. Felt like it was a tad too much stall... these combos had 4.10s I never sent it back to try and get it stalled properly to either combo.
I Will say They were quick to turn my converter around when I sent it in for a cut, clean, and re stall.
Just wasn't ever happy with the performance aspect.
This go around I decided to buy a Yank. Based on my combo, they set me up with an SST3200. I just haven't had time to swap it out. Dave claims he had I believe was one of his 4000 stalls in his truck for testing and it's street manners were good. Even surprised him.
I know another guy with a vigilante and he has been really happy with it.
Prevents future corrosion, Stays on (many of my customers have hot rods and show type cars, so this is important to them), Makes cleanup on a refresh super easy, And just makes it pretty. The case even after soda blasting is still very discolored and restoring the original GM finish would require polishing then a boiling process.
Just some useless info for anyone interested.
The Best V8 Stories One Small Block at Time
Both Frank and FTI will take care of you.
I bought new bell housing bolts, tq converter bolts, U-joints, as well as a trans cooler. Other than fluid is there anything else that you can think of that I’ll need to get this thing into a 4th gen F-bod? I just thought about the tail shaft extension deal. Isn’t there an o-ring between it and the trans? I suppose a new one would be prudent. The seal in the tail shaft housing was replaced not all that long ago because it was leaking. Should I get a new seal for it too or just the o-ring?
I’m going to have a shop do the install but it probably won’t be until mid June or so. Will the deep trans pan cause any fitment issues in a ‘00
Z28? I suppose I should’ve asked prior to ordering.
Another question I have is since I can see clutch material on the paper towel when I check the fluid on the old transmssion should the lines be flushed prior to installing the new transmssion?
Thanks again
Last edited by Y2K_Frenzy; May 30, 2025 at 09:48 PM.
I bought new bell housing bolts, tq converter bolts, U-joints, as well as a trans cooler. Other than fluid is there anything else that you can think of that I’ll need to get this thing into a 4th gen F-bod? I just thought about the tail shaft extension deal. Isn’t there an o-ring between it and the trans? I suppose a new one would be prudent. The seal in the tail shaft housing was replaced not all that long ago because it was leaking. Should I get a new seal for it too or just the o-ring?
I’m going to have a shop do the install but it probably won’t be until mid June or so. Will the deep trans pan cause any fitment issues in a ‘00
Z28? I suppose I should’ve asked prior to ordering.
Another question I have is since I can see clutch material on the paper towel when I check the fluid on the old transmssion should the lines be flushed prior to installing the new transmssion?
thanks again
Yes, cooler lines and cooler should be flushed.
Last edited by bbond105; May 31, 2025 at 05:39 PM.
I bought new bell housing bolts, tq converter bolts, U-joints, as well as a trans cooler. Other than fluid is there anything else that you can think of that I’ll need to get this thing into a 4th gen F-bod? I just thought about the tail shaft extension deal. Isn’t there an o-ring between it and the trans? I suppose a new one would be prudent. The seal in the tail shaft housing was replaced not all that long ago because it was leaking. Should I get a new seal for it too or just the o-ring?
I’m going to have a shop do the install but it probably won’t be until mid June or so. Will the deep trans pan cause any fitment issues in a ‘00
Z28? I suppose I should’ve asked prior to ordering.
Another question I have is since I can see clutch material on the paper towel when I check the fluid on the old transmssion should the lines be flushed prior to installing the new transmssion?
Thanks again
Unless I missed in packing you should have the tail seal. bushing and o'ring tapped to output shaft .(let me know)
To date no one has had any clearance issues with that pan in any application.
Don't forget drain plug and washer are in dipstick hole .
Just holler if you need anything,
Is your check engine light on?
Frank didn’t install it so no one is blaming Frank. The transmission shop who installed it is at fault here for the seal leaking. But your loyalty is admirable though. I think/hope that the fluid getting low from the tail shaft leaking is what was causing the hard shifting since it wasn’t shifting bad until towards the end of the ride. So what I was saying is hopefully the transmission shop that installed the transmission as well as the tail shaft seal (that is leaking) will do right and fix the leak for free. But they might be d!cks and say that they’re not doing any rework since I brought it my own parts. No there isn’t a check engine light on. The fluid was low and the tail shaft seal is leaking.
Last edited by Y2K_Frenzy; Jun 23, 2025 at 09:25 PM.
Shift quality. While this is stage 1 the shift kit and quality will be the same as all other stages . The shift will be firm not slamming but most certainly firm. Not stock like shifts at all. They will be firmer as throttle is increased. To what extent you feel this will depend on several factors . Rear ratio, converter and of course Tune, It is very typical for tuners to increase line with the stock trans and if so you may want to have this undone. This may make the new trans which has larger feed holes. Higher line pressure , A perfectly flat Rev input drum feel to firm if it has been turned up in the past. Of course I cannot feel the shift in your car myself to make a judgement. But It should feel firm to quiet firm depending on the other factors mentioned and become progressively firmer with throttle. Also note as new friction and band "wear in" shift quality will change some over the first few 100 miles.
I did not of course to clarify furnish the tail housing as I do not normally send those this is what is meant when it's said he supplied it. But I would not be quick to say it's actually leaking either as with the dark color could just be assembly lube that melted.
Most important is top off oil. keep checks for leaks. If you get any codes contact me immediately as while I do use new wiring harness and shift solenoids. New ones do fail from time to time usually if they do it in the first few days . though this is rare. Also note that while off hand I do not remember what stall you purchased that depending on gear ratio in rear any stall 2800 or higher has the potential to set a false code PO757 causing limp mode and no shifts starting out in third gear. This would need to be turned off in tune if it happens but is nothing to be alarmed about and may not happen at all.
If you have any questions or concerns feel free to contact me . Here or FB messenger <always best. And Text of course and call if necessary though I may not always hear phone immediately when working in shop but will return call and or text ASAP . FB messenger is best because I keep it up in my shop on screen all day and of course I check here multiple times a day. But strive to be available always.
Hope this info helps
Shift quality. While this is stage 1 the shift kit and quality will be the same as all other stages . The shift will be firm not slamming but most certainly firm. Not stock like shifts at all. They will be firmer as throttle is increased. To what extent you feel this will depend on several factors . Rear ratio, converter and of course Tune, It is very typical for tuners to increase line with the stock trans and if so you may want to have this undone. This may make the new trans which has larger feed holes. Higher line pressure , A perfectly flat Rev input drum feel to firm if it has been turned up in the past. Of course I cannot feel the shift in your car myself to make a judgement. But It should feel firm to quiet firm depending on the other factors mentioned and become progressively firmer with throttle. Also note as new friction and band "wear in" shift quality will change some over the first few 100 miles.
I did not of course to clarify furnish the tail housing as I do not normally send those this is what is meant when it's said he supplied it. But I would not be quick to say it's actually leaking either as with the dark color could just be assembly lube that melted.
Most important is top off oil. keep checks for leaks. If you get any codes contact me immediately as while I do use new wiring harness and shift solenoids. New ones do fail from time to time usually if they do it in the first few days . though this is rare. Also note that while off hand I do not remember what stall you purchased that depending on gear ratio in rear any stall 2800 or higher has the potential to set a false code PO757 causing limp mode and no shifts starting out in third gear. This would need to be turned off in tune if it happens but is nothing to be alarmed about and may not happen at all.
If you have any questions or concerns feel free to contact me . Here or FB messenger <always best. And Text of course and call if necessary though I may not always hear phone immediately when working in shop but will return call and or text ASAP . FB messenger is best because I keep it up in my shop on screen all day and of course I check here multiple times a day. But strive to be available always.
Hope this info helps

Also, I’m not sure if it’s normal to see clutch material in the fluid after a new transmission or if he didn’t flush the cooler it prior to putting the new trans in. But when I wipe the dipstick there’s gray material left behind, just like there was with the old transmission. I have about 20 miles or less on the new trans now. If the installer didn’t fluid the cooler prior which I think is likely, would a “Jiffy Lube” fluid exchange through the cooler lines get it clean? Or do I need to disconnect the lines and flush the cooler and then do a fluid exchange? I don’t suppose it’s wise to drive it until I get it flushed is it? Or is this amount of material left behind “normal?”
/May just be he didn't clean out the dip tube and or stick when he put in. It is however normal to see some thus the reason for the 500 mile filter change.
However if he didnt flush cooler? Well" it is flushed now. So little point in flush now. If in doubt I would just go ahead and change the filter now/ TF-351 at autozone as whatever flushed is in the pan now..
Frank
The vehicle is a stock ‘00 Z28 aside from a muffler, and it has a 3.23 rear end. It currently has 32k miles on it. The tune is also stock fwiw.
I’ll start with the FTI 3200 Street Brawler. As far as the “pros” go, I don’t have any solid data to report like track times or “actual” stall to report. I haven’t gone full throttle from a dead stop yet and I’ve only gone WOT while cruising in 4th a few times, but I believe when it down shifts from 4th to 3rd at WOT it puts the RPM’s somewhere around 4k. With the stock converter I don’t remember the RPM’s being quite as high, so that is a “pro.” Now for the “cons.” The car won’t pull itself in drive anymore, you have to give it gas to get moving. It’ll pull itself in reverse though. I’m sort of use to this next part, but it would be a slight “con” if one was coming from a properly working stock trans & stall. When the ATF is cold (so it seems) the shift from first to second is fairly long/late when you’re giving it light throttle like you would cruising through a neighborhood. When my old transmission started going out the shifts from 1st to 2nd were getting long and drawn out. For example I’m half way down the block before it goes into second where as when the old trans was still shifting well it’d be into 2nd by the time I went two doors down. Overall I think it’s a decent enough converter as long as it doesn’t crap out. That being said, it doesn’t “drive like stock” if that matters to anyone.
Now for the transmission. I realize this is a fairly early review, and I’ll update as the miles come along, but this is where we are so far.
Starting with “the pros.” The WOT and 3/4 throttle shifts are fast, crisp, and drama free. I’ve yet to do a burnout in it but from a highway roll or say 40 mph or so it’s pretty good. Another “pro” I suppose would be it’s 500 horsepower rating although I don’t imagine I’ll ever make enough power to test its limits. Now for “the cons.” Overall the shifts and general “behavior” have gotten better over the 150 miles that it has on it. But the short trip home from the shop that installed it had me worried a little. Light throttle up and down shifts (Neighborhood speeds. Real
slow) were so hard that it’d bang REAL loud and it’d rock the drivers seat. At one point during a down shift I pulled over because I thought the drive shaft fell out 😂. I was going about 5-10 mph or so at the time. I was told that the harsher slow speed down shift is a “side effect” of the PWM mod. After the first drive home I reset the ECU and added some Lubegard “red” and the slow speed downshift hasn’t been near as violent as it was the first time. The first time my head almost hit the windshield😂. It still has an occasional clunk sound on slow speed up and down shifts but it doesn’t clunk every time. If it’s going to “clunk” into gear though, it’s going to happen with less throttle than more. I realize that the transmission has a “shift kit” in it, and that it’s performance oriented and not “comfort oriented.” But I never took into consideration that slow speed drivability would be “harsher” than WOT. I assumed that it would be the other way around when I read that the shifts would get firmer with more throttle. I’m not bashing the build, but I probably should’ve done more homework. That being said drivability has improved quite a bit over the short 150 miles that I’ve driven. It only clunks on occasion (up or down) now. Maybe hopefully it’ll improve some more, but I’m betting/thinking that it is what it is now. Maybe this or that could be tweaked via tuning to make improvements but I don’t have any tuning hardware or software. To sum it up: I think it’s a good transmission but it might scare off some potential buyers in the future if I should ever decide to sell the car. Once again, that’s not a knock on the product but not everyone is going to be into the occasional slow speed clunking.
I bought a “reman” tailshaft housing that already has the bushing and seal in it to replace the leaking one that’s on there now. I haven’t decided if I want to try and attempt it myself or not. I’d like to do it to save a buck of course but I’m not sure yet if I’d bet biting off more than I can chew. At any rate all in all I’m glad to be up and running again and it’s still a fun car to drive. It’s just a little clunky at times when you’re putting around.
Dinner 25 miles away this eve. Good ride.
🤘🏻
Last edited by Y2K_Frenzy; Jul 11, 2025 at 10:29 PM.
slow) were so hard that it’d bang REAL loud and it’d rock the drivers seat. At one point during a down shift I pulled over because I thought the drive shaft fell out 😂. I was going about 5-10 mph or so at the time. I was told that the harsher slow speed down shift is a “side effect” of the PWM mod. After the first drive home I reset the ECU and added some Lubegard “red” and the slow speed downshift hasn’t been near as violent as it was the first time. The first time my head almost hit the windshield😂. It still has an occasional clunk sound on slow speed up and down shifts but it doesn’t clunk every time. If it’s going to “clunk” into gear though, it’s going to happen with less throttle than more. I realize that the transmission has a “shift kit” in it, and that it’s performance oriented and not “comfort oriented.” But I never took into consideration that slow speed drivability would be “harsher” than WOT. I assumed that it would be the other way around when I read that the shifts would get firmer with more throttle.













