Soooooooooo......

Did any of you 3.73 Freaks had a problem with the LT1 bouncing off the rev limiter cause tranny didnt shift fast enough??

If so... how did you fix it?


Marvin

 

I had shift issues (hitting rpm rev limiter) after a crane 210/224 program from pcmforless. The upgrade was ponly to 3.42's and I was using an SLP 2400 stall TC (basically stock with just higher stall). The car made about 295 rwhp up to 6400 rpm and peak of 301 rwhp at 5800 rpm, and it would shift right there at 6400.

It would just hit the rev limiter between shifts real badly.. even still, it ran a 12.99 on street tires like that. Then I retuned on the dyno to a 12.9:1 AF (gave me more power than 13.1:1 all around) and I lowered the peak hp to 5200 rpm (305) and maintained above 290 all the way to 6400. Still would hit the rev limiter, only now I would break the ries lose on the 1-2 shift (i guess from the extra power we gained from further down low, earlier peak) and I ran 3-4 mph slower.. no damn traction

anyways... to make a long story short, it wasn't a programming problem. My cousin is a GM tech and he mentioned that many GM cars come in with shift issues and the problem is the MAP sensor. Swapped it out (28 bucks) and lo and behold, no more shifting issues.

 

This is a new one in my book. I think thats something I would replace just because.

I am considering swapping gears too. some of the things that concern me is any posible problems with the ABS... and what parts I will need.

Currently I have the 2.73s and I have raped a Mustang here and there but nothing to brag about.

So in so many words... what do I need to keep the ABS Stock, What parts and from where to keep the noise low I think the upmost power I will ever required of my baby is 400 crank horses so I wonder if the stock rear end with upgraded gears will even hold.

so many questions here... so little time...


Marvin

 

I'm sorry I made a mistake, it is not the MAP sensor, it was the TPS.



I just replaced the MAP later on as preventive maintenance you could say.

 

MentalCaseOne:
You have 2.73 gears and want to know if upgraded gears will handle up to 400 flywheel horsepower, and how to retain the ABS functionality.

The horsepower issue is only an issue IF you run drag slicks and / or race it from a dead stop on a regular basis. Drag Radials CAN lead to a dead rear, but they're less likely to do it than slicks like ET Streets. If you do most of your racing on Street Tires (you don't race on the street do you?) then you should be ok. Shoot, I know of people pushing 450 and more HP at the wheels still running on the stock 10 bolt. It is weak, but it's not as weak as some make it seem. And most performance gears are stronger than the stockers. I think the weakest parts are the gears themselves, and the axles.

As for the ABS, you have a couple of things to think about here.
First, if your car has traction control (ASR to some people), then you have 4 channel ABS (sensors near the wheel) so you can change carriers all you want and not have any problems with the ABS system.
If you don't have traction control, you have 3 channel ABS, so that leads to another question... Are you replacing the carrier when you step up to your new gears? If you are, then you have to also purchase a replacement reluctor ring to retain ABS operation. If you're sticking with the 2 series carrier, and you're getting a new gear set for the 2 series carrier, then you shouldn't have to do anything to the reluctor ring to retain proper ABS function.

Hope that helps!

 

Most defenetely!

Thanks a million. I have a series 2 carrier and a 3 channel ABS sistem. I want to keep the ABS functional. No I dont race on the streets officer .

I want my baby to be the race capable yet subtle street machine.


Marvin

 

Alrighty then Now how about YOU giving Me my money BACK!! Its yer freaking fault!!! (grin).


Nah jest kidding dude . I am glad I came back to read this thread.

Thanks for the info.

Marvin

 

Grrr......I can't wait to get these damn things installed! My dad's friend just got 3.73s put in his '90 Mustang GT convertible stepping up from 3.08s, and man what a difference. The installer usually does gears on weekends, and he's going on vacation thursday, and getting back the following thursday. So, I'll probably have them installed the weekend after the following, which gives me time to decide how I'm getting my PCM reprogrammed.

 

just ordered programming from www.madz28.com .....gears go in next weekend. I'll keep you guys updated.