How does these gears perform? I have a 3.27 set I was going to put in and have a 2800 stall converter coming. The pinion has a small chip on the end of one tooth and it worries me. One guy recommended 3.73's and I have 9-bolt with my 700r4. Would this be too much for my overdrive tranny? I hear it would be too much for TPI but others say they love it.

The picture is one I found of the internet so ignore the red circles. The yellow shows about how much is chipped. Do you think it will cause problems? Engine is stock 350 TPI right now but super ram will be eventually put on. I am doing the tranny now for a more stout motor.

 

i have 4.10s with my 700r4. When doing about 72 the tans is at about 3000 rpms. Its fine for me b/c i dont go real far with the car anyway .

 

The 3.73's are fine for their application, but 4.10's are also. If you care about gas mileage and rpm/noise, stick with the 3.27's and get more converter, like a 3500 stall. I don't think those gears look too bad, most of the tooth contact occurs in the middle of the tooth anyway.

 

I have 3:73 in my 9 bolt. I like the gear , it works well. When I had the stock TPI it was alittle much but with my Super Ram and high-flo base I have afew hundred extra RPMs so its perfect.

 

Sorry if it's a little late, but the gear will be fine as long as the chip isn't in the contact patch.

89GTA383, will the 1/4 performance be about the same teetering the rear gears and the converter flash point like that? I'm also looking for a new converter to put me back in my powerband. While fuel mileage would be nice, it isn't a be all end all.

For my combo I was thinking 4:11's and a 2800 stall. According to DD2000 my torque peaks at approx 3500 RPM. The difference between 3000 and 3500 is only 15 crank hp though, so I'd rather not pay the extra $450 to step up the 15hp

BTW, I do realize that DD2000 isn't the most accurate as far as power ratings go, but it is supposed to be pretty close perportionally

My mods are in the sig.

 

You'd probably get a lower et with the 4.10's and 2800 stall versus the 3500 stall and 3.27's. The 3500 stall with the 3.27's will be alittle loose, and you will have to get used to it, but the 4.10's with 2800 will feel 'tighter'. Big difference in cruise rpm with the 4.10 vs 3.27, so if that matters, go with the lower gear and more stall. You will need a sticky tire with either combo.

 

Awesome, thanks

I think I'll order up the 2800 stall and 4.11's then. Do you have any experience with Raptor or Edge racing? Those are the two main ones I'm considering at the moment.

 

I just got my tranny done and put in a Edge 2800 stall lock up converter and shift kit and it works great. I still have my 2.77s in but will put in the 3.27s later. I realized with 2800 stall, I dont really need the gears yet. I think 3.27s is all you need for good street fun. It is tricky to launch cuz all that torque at 2800-3000 rpm is transfered to the tires. Gotta walk into it alittle to keep spin down. I couldn't imagine with 3.73's or higher. I do need LCA's and relocation brackets since I lowered it. Mid range passing power is great and locks up at about 40 mph.

At 80 mph, I am doing 2100 rpm for some reason but before it was like 3000 with stock converter. Shifts are quick but smooth and the gears seem like close ratio manual now. Very little rpm loss between 1st-2nd-3rd gear shifts. Can wait to get some track times. Highly recommend Edge. Good product and they will set the converter up based on your cars specs. You will be very happy. Custom Street Edge converter ran me $554 shipped ground.

 

I threw a 3.73/posi/disc axle from an '84 trans am under my '86, the car performed great. With the overdrive, I didn't even notice a difference at cruising speed except that the car was more "peppy". I also have the B&M 4-3 kickdown kit (TV sleeve) in the trans, so my 700r4 will hold 4th like hell. I can actually use OD to accelerate with, instead of the trans kicking down into 3rd. Accelerating in OD with the 3.73's was great!

Then the posi (stupid eaton gov-lock) blew- and I'm back on an '88 camaro's 3.42/open/drum axle. After I do all my bodywork, I've gotta dig up the scratch for a new 26 spline posi unit (since SLP ran out of their 28 spline take-off's).

 

I've got 3.73's in my formula and it was a very noticeable difference from the stock 3.23 gears. I am not sure what speed I am going, but on the speedo, I am cruising at 80-85 at 2.5K rpm.
My tranny also upshifts to 4th at WOT.

 

Orr89RocZ, thanks for the good word on Edge, I have one in mine, but haven't got the motor fired up quite yet. I was taking a chance, and looks like it may have paid off.

Tom P, nice to hear your kickdown thing is working for ya. I put one in mine, but see above for testing.

Man, I want this thing to be running so bad.... but I'm not going to rush this one.

 

im lookin to drop in a 383, lookin for daily driven and a drag race 1-3 times a year, and some highway fun, what would be a good combo? could i still keep my stock rear? 700r4 is what i have on the 92 rs

 

At highway speeds, you're only looking at a few hundred rpm difference in speed between the 3.73's and the 4.10's.

On a performance calc I was playing with, the difference between the two gearsets was about 2 tenths of a second though. Makes a big difference for launching a heavy car like ours

Also note though, my car isn't a stock TPI though. My powerband actually climbs to 6000 rpm

I just ordered up my 4.10's and a 2800 stall last night. Hopefully I'll be putting em in next weekend.

For the 383, I'd say go with the taller gears to get the mass rolling, and then get a TC to match close to whatever peak tq is for your motor.