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4T60E Shift Kit


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Posted

Anybody have a shift kit in their Z? Or any with the 3.4/4T60E combo..... How is it as a daily driver? Did it make and drastic changes?

 

I have one in my truck and it'll chirp into 2nd and shifts quicker. Feels alot more responsive. Just curious. I'm dropping the pan to do the filter I just figured if it's a good decision i'd do the shift kit as well.

Posted

Got one on mine. Chirps while shifting into 3rd even. Daily driving, it does get a little harsh, but thats because mine slams into every gear. It's fun though.

Posted

Just really don't wanna accelerate the life of the tranny. So far it's the only thing i havent replaced. damn me for saying that.....wheres wood i gotta knock it..

Posted

i've heard some shit about the 4T65E i believe or maybe a 4T60EHD on this board somewhere. I could look into that. Go all out slap in a manual valve body and a trans brake slap a quarter stick in'r and off to da races..yeeeee haaaaaaaawww

Posted

4t60e HD. Your car should allready have better internals. But... if you spend a decent amount of money, you can get stuff thats better.

Posted

how about kit for a 3.1/4t60e combo? where you guys pick up stuff like that?

 

 

still a n00b, no flaming on stupid ?'s please :oops:

Posted

Its the same transmission. ;)

 

Is Strecker transmission an "E" transmission? Its an MPFI, right?

Posted

Yeah same deal. If you want to firm up your shifts without opening up the tranny, look into an adjustable vacuum modulator. But it won't do much of anything for WOT shifts.

Posted

getting off topic a bit but I did some research on the 4t60e today in class. and actually i had thought that all of the 4t60e's were the same. however based on the car they were hooked too determined the internals that came with it. If you have a 3.4dohc - 4t60e combo you are looking at a final drive ratio of 3.06:1 and a stall speed of 2095rpm. The highest final drive ratio that was available on the 4t60e was 3.33:1. So by changing the sungear in the tranny you a gettin a better jump out of the box. @45mph with the stock 3.06 and stock tires, you should be in the 1700 rpm range. Goto a 3.33 and switch to a slightly smaller tire you should teoretically be in the 1900 rpm range at 45mph. now. keep in mind i am just now learning all of this. Please point out anything that i may have written that is wrong. Gotta learn somehow. ADAM

Posted

I had one installed in my tranny when I got it rebuilt last fall. That, combined with an adjustable VM and my shifts are quite firm but it doesn't chirp them.

Posted
getting off topic a bit but I did some research on the 4t60e today in class. and actually i had thought that all of the 4t60e's were the same. however based on the car they were hooked too determined the internals that came with it. If you have a 3.4dohc - 4t60e combo you are looking at a final drive ratio of 3.06:1 and a stall speed of 2095rpm. The highest final drive ratio that was available on the 4t60e was 3.33:1. So by changing the sungear in the tranny you a gettin a better jump out of the box. @45mph with the stock 3.06 and stock tires, you should be in the 1700 rpm range. Goto a 3.33 and switch to a slightly smaller tire you should teoretically be in the 1900 rpm range at 45mph. now. keep in mind i am just now learning all of this. Please point out anything that i may have written that is wrong. Gotta learn somehow. ADAM

 

I think there's some mistakes there...

3.4 DOHC's got a 3.43:1 FDR. 2.8/3.1/3100 were 3.33:1.

Posted

well i am going with what the 4t60e shop manual stated... like i said.. i am new at this

Posted

Well, I'm back from work. :P Guess I'll do what I'm infmaous for. :)

 

If you have a 3.4dohc - 4t60e combo you are looking at a final drive ratio of 3.06:1 and a stall speed of 2095rpm.

 

Gnat's right.....3.43. I don't know about the stall speed.

 

The highest final drive ratio that was available on the 4t60e was 3.33:1.

 

Actually.....the highest is in the newer Monte Carlo....2.84s baby.

 

So by changing the sungear in the tranny you a gettin a better jump out of the box. @45mph with the stock 3.06 and stock tires, you should be in the 1700 rpm range.

 

This statement confuses me.

 

Goto a 3.33 and switch to a slightly smaller tire you should teoretically be in the 1900 rpm range at 45mph.

 

Confusion is amuck.

 

now. keep in mind i am just now learning all of this. Please point out anything that i may have written that is wrong. Gotta learn somehow. ADAM

 

I think I did. ;)

 

Remember.....the larger the number the lower the gear ratio. Its input turns to output turns. So for a 3.43 ratio.....for every 3.43 turns of the input shaft, the output shaft turns once. Yep, you do turn a lot, but you are able multiply your torque by the ratio.

Posted

ok time to make up for the dumb shit that came out of my mouth. now i was a lil confused with the higher gear. i meant higher numbered gear.. now i understand. as for the 3.43 ratio.. that is NOT the final drive ratio. that is considered the "overall ratio" remember that there are 2 sprocket gears in a fwd trans that also have a reduction. the final drive ratio is 3.06 in the 4t60e/3.4dohc combo. (well to be precise in the 4t60e model 1cww,2cww,2c4w, and 3cww.) Based on the sprocket sizes (37 driven and 33 drive) your ratio for the between the 2 is 1.12:1. Multiply your final drive ratio (3.06) by your driven/drive ratio between the chain and sprockets (1.112) and you will have your overall ratio of 3.43. thus for every 3.43 turns of the input shaft you have one revolution of the tires. On a 4t60e you can swap out the 34 tooth sungear and the 18 tooth pinion gears in the carrier (3.06 FDR) for a smaller 30 tooth sun gear and carrier with 20 tooth pinion gears giving you a final drive ratio of 3.33. now figure in your chain drive and sprocket gear ratio (1.12) and you will have an overall ratio of 3.73 :1. The 4t60e was not built with these combinations from the factory that we could find. However you can order the parts while rebuilding your 4t60e and do it yourself. So give me 4 more weeks I will be doing this build in class. I should be able to throw the tranny on the dyno and see what it does while strapped to a 3800 series 2. As for the other equations about the mph, rpm and gears.. With the stock settings in a 4t60e with and overall gear ratio of 3.43. @ 1000 rpm the car should be moving at 23.08 mph. Changing the sun and pinion gears and having an overall gear ratio of 3.73 @ 1000 rpm the car should now be moving at 21.2 mph. so let me know which one you would like in your car. Sorry to confuse you and myself at the same time. hope this clears it up....

Posted

not that it matters for our purposes but the 4T60E was also made in RWD form.....didnt know that until yesterday.... just another blurb of useless info....

Posted

The 4"L"60E

 

L for Longitudinal mounting, and T for Transverse mounting.

  • 11 months later...
Posted

its wrong, it is a 3.43 fdr, that wast the higest it came with and the lowest was a 2.84? but yea there was the 2.93, 3.03 i think and the 3.33. i belive the rpo for the 3.33 is GX3

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