Wert842

iTrader: (3)

Well I was going up a hill in forth and it started lugging a bit. Downshifted to third and gave it gas. It crackled and then there was nothing. Shifted to second to get moving again and it did the same thing. Moved to the side of the road cause it sounded like something was dragging. Spotted fluid spewing out of the bottom of the trans. Going to look more into it tomorrow after work seeing as its pitch black out right now. First gear works and moves, but it is weird and doesn't feel anything like it should and kind of bounces around. More than likely just going to get a new one if it is bad...

Anyone have a good recommendation for a trans for a fully bolted TC with a ZFR?

PLUS ONE FOR MORE AND BETTER PARTS TO BE PUT ON THE CAR!!!

Oh, here's a pic!

ssyellow

Making me not want to upgrade the stocker every time I hear one of these.

Sounds like you weren't even lugging on it in third, just a little gas. Sorry to hear. I've heard Powell makes an upgrade I believe? Maybe I'm wrong. ZZP has the 6 speed but no 5 speed upgrades last time I looked.

Omiotek

iTrader: (2)

if your going to scrap it i want the case parts

BLAZIN07SS

iTrader: (7)

want to do it cheap? pick up an LSJ trans

Wert842

iTrader: (3)

Rather do it right more than anything. I don't want a junk tranny going into this if it's going to do it again.

Lol. I'll let you know what happens!

I looked at zzps, but you gotta get a f40 trans too. It all adds up to more and more cash...

BLAZIN07SS

iTrader: (7)

LNF and LSJ transmissions are the same besides the final drive. LSJ gears are shorter and provide less stress on the whole trans

Wert842

iTrader: (3)

So, less torque and more top end?

BLAZIN07SS

iTrader: (7)

LSJ is 4.05, LNF is 3.82. stock gearing in LNF is longer, LSJ gears are shorter. it will accelerate quicker

Omiotek

iTrader: (2)

i have a project for the case... just want a bare case with all the other parts. no gear set.

Wert842

iTrader: (3)

So, I have it backwards, more torque?

redcobalt07

iTrader: (18)

Did the guy load the car on the truck backwards?

andrewcarr1993

iTrader: (5)

Gears are literally shorter so for example if your old trans LNF went 100 in 3rd the LSJ might only go 90 in 3rd (just numbers pulled out of thin air). Shorter means shifting more but faster acceleration.

No he loaded it on forwards and spun it around once on the truck

09whteSSpssssh

Kind of wert, let me explain it to you easily.

If you have ever ridden a multi speed bike you know as you shift up the gears it becomes exponentially harder to pedal. A car is no different, thats why sometimes going up a hill for example is especially stressful. Its like you trying to pedal in a high gear uphill, its hard, for you and the bike/car. You have to work harder to pedal, which puts more stress on the gears/chain/trans of a car etc etc. So by upping the final drive ratio, your making every gear overall have a little more leverage then before by just having that one drive gear(basically the gear that the chain drives on the rear tire same thing as a final drive gear, as it is) Therefore the whole car is working a little less hard in every gear, but you will wind it out faster since the ratio is shorter. So there is trade off, though longevity in the car game is more important than top end speed. It may even help 1/4 times if you can put the power down, since you will a little more easily.

Wert842

iTrader: (3)

We had too. I'm lowered and we tried just driving it on forwards and it was basically just going to rip my front bumper off. There was no way it was going on forwards. We tried 3 different spots. Uphill, flat, and downhill. We finally got it on reverse but had to wedge the front off the ground a bit so it didn't scrape horribly.

I'm doing my research on all this, but nothing I'm really stumbling upon seems to be my best bet. LSJ gears are shorter, but I'd loose the power up top, but accelerate quicker. And if I were to get another LNF tranny and get the 4.45 gears they would even be shorter. It would be nice being able to accelerate faster, but the top end pull is what I love. It just keeps going and going.

But my question is, if the gears are shorter, wouldn't it cause more stress?

andrewcarr1993

iTrader: (5)

Just go 6 speed then.

Omiotek

iTrader: (2)

the 4.45 is a good race gear imho..... sucks on gas. ay 80mph your at like 3200rpm where as in a stock lnf i think at 65 your at 3k.

theres zzp you can go with their built trans, 6 speed etc etc... i have my own thing im going to do.... dont really wanna ask you to guinea pig it though.

574

iTrader: (5)

I'll guinea pig it! lol

09CobaltSS1

Wert, the gearing in the lsj trans won't net you any loss up top. If anything it will help your top end acceleration a tad.

It's sort of the other way around. Stock lnf 80 is about 3k, where as the 4.45 would put you at about 3k around 70.

cw383

iTrader: (6)

Sam, not as bad as you would think, and unless you plan to go 200MPH, its almost not a factor. Using that bike example, think of how much less stress is on the chain in 1st gear vs 18th. Check out this example, thank you EXsoccer1921

With that being said for the sake of this article i'll use a 235/40/18 tire and a 7,200rpm rev limit for my "stock data" as thats what majority of this community runs for a tire and limit.


With that tire and limit, RPM vs Gear looks like this (for sake of space i'll only be showing 6200-7200)

LSJ 4.05

RPM 1st 2nd 3rd 4th 5th
6200 34 66 98 130 165
6300 35 67 100 132 168
6400 35 68 101 134 171
6500 36 69 103 136 173
6600 36 70 104 138 176
6700 37 71 106 140 179
6800 38 72 108 143 181
6900 38 73 109 145 184
7000 39 74 111 147 187
7100 39 75 112 149 189
7200 40 76 114 151 192


LNF 3.82

RPM 1st 2nd 3rd 4th 5th
6200 36 70 104 138 175
6300 37 71 106 140 178
6400 37 72 107 142 181
6500 38 73 109 144 184
6600 39 74 111 147 187
6700 39 75 112 149 189
6800 40 76 114 151 192
6900 40 78 116 153 195
7000 41 79 117 156 198
7100 42 80 119 158 201
7200 42 81 121 160 203


LNF/LSJ 4.45

RPM 1st 2nd 3rd 4th 5th
7500 36 70 104 138 175
7600 37 71 105 140 178
7700 37 72 107 142 180
7800 38 73 108 144 183
7900 38 74 110 145 185
8000 39 74 111 147 187
8100 39 75 112 149 190

Using these 3 formulas, your RPM at 60MPH if you care about that sort of thing would be
3.82=2133
4.05=2250
4.45=2567

There might be a very small variance in tire hight in above example. I'm too tired to look it up, but it wouldnt be more then a hundred rpm or so.

Wert842

iTrader: (3)

That's so much more shifting and you don't get much of a power band. It'd seem so quick especially with all the shifting.

In my car at 80 in 5th its at 2900-3000. Well I think it was.

Why do you say the 4.45 is a better race gear? From my understanding you'd HAVE to shift into forth crossing the quarter mile line cause it's quite a shorter gearing. Elapsing more time instead of letting it rev out.

I'm not arguing with anyone, just trying to understand what would be best for me. I'd be down to guniea pig. Lol.

Sent from my Samsung Galaxy S4 using CobaltSS

Wert842

iTrader: (3)

OK I got it now. I'm definitely more of an image person compared to just an explanation. The 4.45 gears actually don't seem so bad after all. The life of the tranny would be saved since it isn't really working as hard down low compared the stocknlnf tranny. That might be a damn good option...

Sent from my Samsung Galaxy S4 using CobaltSS

EXsoccer1921

iTrader: (14)

ZZP isn't making any more 4.45s

raver0789

Who just bitched about gas and the 4.45...come drive my v8 sierra my cobalt is like a motorcycle with my 4.45

Macgyver2484

iTrader: (3)

I have a 4.45 F35 trans with a ZFR and I wouldn’t say the gas mileage has tanked. I still get around 26-27 MPH according to the speedometer. I’ve gotten 30 MPH one week driving normally staying out of boost for the most part.

I’m not sure why they stopped offering the 4.45 gearing. That’s a shame because acceleration is outright fantastic. Maybe to promote their F40 transmissions?

Fastgti69

Sub'd. Save yourself some money and play it safe. The LSJ tranny will do you good.