wrong gear

**redynscire** · 06-09-2011

ok. i know i have the wrong gear in my 02'gtp
(3.29 vs. 2.93) but i am NOT throwing any trouble codes (p0730)
it should throw that code right?

**Trannyman95** · 06-13-2011

If the gear ratios do not match then code P0730 for incorrect gear ratio will set after roughly the 2nd shift cycle. How do you know the gear ratios dont match? Did you replace your transmission? Some aftermarket reprogrammed pcms turn off code P0730 which makes diagnosing problems like this a nightmare.

**redynscire** · 06-13-2011

The guy i was hoping to hear from....
I should've been more clear. I have a 95' Monte, L67, OBD2 swap with 99' z harness.
Its got the pcm from the car I got the motor from..an 02' GTP. Got the motor and pcm from picknpull. I am 90% sure this was
an all stock car..meaning no tuning.
I got a rebuilt BCB 4t65e from a 01' GT
an Example how it acts.., Your cruising down a street that has a 35mph speed limit. You are doing 35mph. When you start to come up on a car in front of you, say that is doing 30mph. The slow mf's just slowed you down. While you are behind them it seems to be just that right speed where.(mainly uphill) as soon as your on the gas, the tc locks. Your gaining on the car in front of you.
So you let off the gas, the tc unlocks...on the gas, it locks again...ect,ect... endless cycle. That just doesnt seem like it would be good on it. Like its locking too soon in third. Only other thing is at WOT i think it shifts into 3rd, converter locks the same time as the shift. The car bogs right after 3rd shift, then the rpms jump up 5-600 after a split sec., and the car pulls hard again.

**BillBoost37** · 06-14-2011

At 70mph what rpm do you see? Taht's the quickest way for us to tell if you have 3.29's.

Everything sounds like it's working fine from your description though.

**redynscire** · 06-14-2011

70mph the rpms are right at about 3k, OD

**Trannyman95** · 06-14-2011

That sounds like your in 3rd gear. If you shift between 3rd and 4th is there any difference in rpm? Do you have any way to scan transmission data while you drive? That would be a good way to see what is really going on.

**BillBoost37** · 06-14-2011

Like Dave mentioned. 3K is too high for 3.29 gearing. That is just about right for not having 4th gear.

**redynscire** · 06-14-2011

i have 4th gear
i have no way to scan while driving..
got the car tore apart
for LIM gaskets..so i cant go test drive...
OK..i just looked at a crappy video i made and
third gear 60 mph is at 3k exactly

**redynscire** · 06-15-2011

Got the car together, went for a drive. 3rd gear at 62mph is dead on 3k.
4th gear at 70mph is roughly 2200rpm. what do you think, 3.29's or??

**BillBoost37** · 06-16-2011

I think that's 2.93's personally.

**FordMan77** · 06-16-2011

I think Bill is right because in my 00 GT in OD I cruise right around 2200 at ~70mph. This is of course with the 3.29 gears of the GT. Being you have the GTP I don't see why it would cruise any higher at 70mph than a GT even with the 2.93's. I would think they would be just about the same, but never rode in a GTP to see the difference.

**BillBoost37** · 06-16-2011

An Sc'd car with 2.93's and our slight tac differences.. it's about right for 2.93's. 3.29's would put you closer to 2400.

**Swiggles** · 06-16-2011

im at 3k at 80mph, i have 3.29 gears (only way the 1"chain came right?) is that normal?

**BillBoost37** · 06-16-2011

1" came a couple different ways. but yeah, the one you have should be 3.29's.

**Swiggles** · 06-16-2011

so is 3k rpm ok at 80 mph?

i just went back to stock l36 settings on the trans so i have to do a test drive to make sure thats were its still sits.

**BillBoost37** · 06-16-2011

New thread bud

**Swiggles** · 06-16-2011

sorry didnt mean to highjack, figured since we were talking about high rpms in 4gear it would be relevant.

**redynscire** · 06-16-2011

Originally Posted by FordMan77

I think Bill is right because in my 00 GT in OD I cruise right around 2200 at ~70mph. This is of course with the 3.29 gears of the GT. Being you have the GTP I don't see why it would cruise any higher at 70mph than a GT even with the 2.93's. I would think they would be just about the same, but never rode in a GTP to see the difference.

Your 00' GT in OD at 70mph is right around 2200....
Thats what i said my car does..
i think i have 3.29's. was the BCB trans used in gtp?
i have looked at some 4t65e info.. 99'-01'
HERE
http://www.gmtuners.com/transmission/1999_4T65-E.pdf
http://www.gmtuners.com/transmission/2000_4T65-E.pdf
http://www.gmtuners.com/transmission/2001_4T65-E.pdf

my trans is a 1bcb. says they are used in the Venture, Silhouette, Trans Sport, Pontiac Grand Prix, Pontiac Aztek (2WD) 99-01

**BillBoost37** · 06-16-2011

The piece of information that is not mentioned there is if the car is charged or not. All sc cars had an HD trans. All HD tranmissions had 33/37 gearsets and a 3.29 differential ratio. Combined this equates to a 2.93 overall ratio. The na cars all had non-hd transmissions and all non-hd transmissions had 35/35 gearsets. So the diff was the overall ratio.

Unless you trans was swapped out, you have no reason to not have 2.93 gearing. To have 3.29's your trans would have had to have been swapped with a non-hd trans and then the HD diff put into it.